RFC1382

Network Working Group D. Throop, Editor Request for Comments: 1382 Data General Corporation

                                                       November 1992

          SNMP MIB Extension for the X.25 Packet Layer

Status of this Memo

This RFC specifies an IAB standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "IAB Official Protocol Standards" for the standardization state and status of this protocol. Distribution of this memo is unlimited.

Abstract

This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in TCP/IP-based internets. In particular, it defines objects for managing the Packet Layer of X.25. The objects defined here, along with the objects in the "SNMP MIB Extension for LAPB" [9] and the "Definitions of Managed Objects for RS-232-like Hardware Devices" [8], combine to allow management of an X.25 protocol stack.

The Network Management Framework

The Internet-standard Network Management Framework consists of three components. These components give the rules for defining objects, the definitions of objects, and the protocol for manipulating objects.

The network management framework structures objects in an abstract information tree. The branches of the tree name objects and the leaves of the tree contain the values manipulated to effect management. This tree is called the Management Information Base or MIB. The concepts of this tree are given in STD 16/RFC 1155, "The Structure of Management Information" or SMI [1]. The SMI defines the trunk of the tree and the types of objects used when defining the leaves. STD 16/RFC 1212, "Towards Concise MIB Definitions" [4], defines a more concise description mechanism that preserves all the principals of the SMI.

The core MIB definitions for the Internet suite of protocols can be found in RFC 1156 [2] "Management Information Base for Network Management of TCP/IP-based internets". STD 17/RFC 1213 [5] defines MIB-II, an evolution of MIB-I with changes to incorporate implementation experience and new operational requirements.

STD 15/RFC 1157 [3] defines the SNMP protocol itself. The protocol defines how to manipulate the objects in a remote MIB.

The tree structure of the MIB allows new objects to be defined for the purpose of experimentation and evaluation.

Objects

The definition of an object in the MIB requires an object name and type. Object names and types are defined using the subset of Abstract Syntax Notation One (ASN.1) [6] defined in the SMI [1]. Objects are named using ASN.1 object identifiers, administratively assigned names, to specify object types. The object name, together with an optional object instance, uniquely identifies a specific instance of an object. For human convenience, we often use a textual string, termed the OBJECT DESCRIPTOR, to also refer to objects.

Objects also have a syntax that defines the abstract data structure corresponding to that object type. The ASN.1 language [6] provides the primitives used for this purpose. The SMI [1] purposely

restricts the ASN.1 constructs which may be used for simplicity and ease of implementation. The encoding of an object type simply describes how to represent an object using ASN.1 encoding rules [7], for purposes of dealing with the SNMP protocol.

Format of Definitions

Section 4 contains the specification of all object types defined in this MIB module. The object types are defined using the conventions defined in the SMI, as amended by the extensions specified in "Towards Concise MIB Definitions" [4].

Overview

Informal Overview

This section describes how the objects defined below relate with other MIBs. This section is only informational to help understand how the pieces fit together.

The objects defined below are used in conjunction with MIB-II and other MIBs such as the LAPB MIB [9]. A system with a complete X.25 stack running over a synchronous line will have at least two interfaces in the ifTable defined in MIB-II. There will be an interface for LAPB and another interface for the packet layer of X.25. There will also be objects defined in the RS-232-like MIB for the physical sync line.

Each software interface identifies the layer below it used to send and receive packets. The X.25 MIB object, defined below, x25OperDataLinkId, specifies an instance of lapbAdmnIndex for the LAPB interface under that X.25. The LAPB object, lapbOperPortId, identifies an instance of the rs232PortIndex for the the Sync line used by LAPB.

For X.25 running over LAPB over Ethernet, the lapbOperPortId would identify the instance of ifIndex for the Ethernet interface.

Each X.25 subnetwork will have separate entries in the ifTable. Thus a system with two X.25 lines would have two ifTable entries for the two X.25 packet layers and two other entries for the two LAPB interfaces. Each X.25 Packet Layer MIB would identify the instance of the LAPB MIB for the interface below it. Each LAPB MIB would identify the Sync line below it. The system would also have two entries in the rs232PortTable and rs232SyncPortTable for the two physical lines.

Since the ifTable as defined in MIB-II is device independent, it doesn't have anything specific for any type of interface. The

objects below define the X.25 packet layer specific information for an interface of type X.25. Different X.25 interfaces can also be differentiated by matching the values of ifIndex with x25AdmnIndex.

Textual Conventions

This MIB introduces a new data type as a textual convention for use with X.25. This textual convention enhances the readability of the specification and can ease comparison with other specifications if appropriate. It should be noted that the introduction of such textual conventions has no effect on either the syntax nor the semantics of any managed objects. These conventions are merely an artifact of the explanatory method used. Objects defined in terms of one of these methods are always encoded by means of the rules that define the primitive type. Hence, no changes to the SMI or the SNMP are necessary to accommodate these textual conventions which are adopted merely for the convenience of readers and writers in pursuit of the elusive goal of clear, concise, and unambiguous MIB documents.

This MIB introduces the data type of:

                   X121Address

Structure of MIB

Instances of the objects defined below represent attributes of an X.25 Packet Layer interface. At present these interfaces are identified by an ifType object in the Internet-standard MIB-II [5] of:

             ddn-x25(4), and
             rfc887-x25(5).

For these interfaces, the value of the ifSpecific variable in the MIB-II [5] has the OBJECT IDENTIFIER value:

             x25    OBJECT IDENTIFIER ::= { transmission 5 }

The objects defined below are similar to those defined in a draft ISO document for X.25 management [11]. Some object definitions also reference the ISO specification for X.25 [10] to specify the section that will give the reader additional information about the object. Access to those documents maybe useful (but isn't essential) to understand the names and semantics of some objects. The similarity of these objects with the ISO objects minimizes the instrumentation required by those systems that support both OSI and TCP/IP management protocols.

Since the objects defined here are extensions to the Internet Standard MIB [2] and thus also an extension of the second version, MIB-II [5], the objects defined here explicitly do not duplicate objects defined in existing standards. In some instances clarification of how to apply those objects has been given.

The relationship between an X.25 Packet Layer interface and an interface in the context of the Internet-standard MIB [5] is one-to- one. As such, the value of an ifIndex object instance can be directly used to identify corresponding instances of the objects defined below.

Tables

The objects below form several tables. These tables are:

                           x25AdmnTable
                           x25OperTable
                           x25StatTable
                           x25ChannelTable
                           x25CircuitTable
                           x25ClearedCircuitTable
                           x25CallParmTable

The x25AdmnTable defines objects for the parameters of an X.25 interface which the administrator can read and set. These objects are used at interface initialization time to start the interface. Once the interface has started, changes to the objects in the Administration table may not take affect until the interface is re- initialized.

The x25OperTable defines objects that report the current parameters used by a running interface. These objects are read-only.

The x25StatTable defines objects that report operational statistics for an X.25 interface. These are read-only counters of events that occurred at the interface.

The x25ChannelTable defines objects to allow the administrator to manage the division of channel numbers.

The x25CircuitTable defines objects that return information about existing X.25 circuits. These entries result from calls placed or answered by the PLE or from PVCs.

The x25ClearedCircuitTable contains objects for recording the termination information from circuits that cleared abnormally.

The x25CallParmTable defines the call parameters used to call other systems. This table contains call parameter entries which are referenced by other tables. For example, the x25AdmnTable has one object that identifies the entry in the table for the default PLE parameters. The x25CircuitTable has one object that identifies the entry in the x25CallParmTable for the parameters in use by that circuit. Other MIBs may also reference entries to identify call parameters to use to make X.25 calls.

Table Usage

Different tables provide different functions. The administrator sets the starting X.25 parameters in the x25AdmnTable for the X.25 PLE; these objects include a reference to the x25CallParmTable entry to identify the default call parameters for the PLE. Once all the parameters are set, the administrator initializes the interface. As part of initializing the interface, the operating parameters are copied into the interface from the x25AdmnTable; these parameters are viewable by getting the objects in the x25OperTable. (The interface maybe started by setting the value of ifAdminStatus to up.) If any PVCs are configured, their parameters can be set in the the x25CircuitTable before initializing the interface; this should be done in conjunction with configuring higher layer entities to use the PVCs via the MIBs for those entities.

Once the PLE completes initialization, it makes additional entries in the x25circuitTable for calls placed or answered. When a circuit is cleared, the status of the entry for the circuit is set to closed and, if the clear is abnormal, an entry will also be made in the x25ClearedCircuitTable. An entry in the x25CircuitTable with a status of closed maybe deleted by the agent at its convenience. A closed entry will always be reused at the time the PLE re-allocates the channel number of the entry for another call. The call parameters used for a circuit can be found by looking in the x25CircuitTable and following the x25CircuitCallParamId pointer to the entry in the x25CallParmTable that contains the parameters.

There are no mechanisms in the X.25 MIB for telling the PLE to place an X.25 call. Such mechanisms belong in the MIBs for the higher layer entities that use the X.25 circuits.

Conformance

All the objects defined here are mandatory. To claim conformance with this MIB an implementation must support all objects. However some objects pertain to features that are optional. There are values defined for those objects that indicate the implementation does not support the optional feature. The agent for such an implementation

must support reading the object and return the value that indicates the optional feature isn't supported and reject set requests to change the object.

Some optional features have more than one object that pertain to it (window rotation has a timer, a count, and a counter for timer runouts). In such case, any object which indicates the optional feature isn't supported is sufficient to indicate the feature isn't supported and the values of the other objects relative to that feature are undefined.

Object Definitions

      RFC1382-MIB DEFINITIONS ::= BEGIN

      IMPORTS
              Counter, Gauge, TimeTicks
                      FROM RFC1155-SMI
              OBJECT-TYPE
                      FROM RFC-1212
              DisplayString, transmission
                      FROM RFC1213-MIB
              TRAP-TYPE
                      FROM RFC-1215
              EntryStatus
                      FROM RFC1271-MIB
              PositiveInteger,
              IfIndexType
                      FROM RFC1381-MIB;

      x25     OBJECT IDENTIFIER ::= { transmission 5 }

      -- Support of the X25 subtree and all subtrees under it
      -- is mandatory for all agents of system that implement X.25.

      X121Address ::= OCTET STRING (SIZE(0..17))
       -- 0 to 17 bytes in length containing the ASCII
       -- characters [0-9], each octet contains one digit
       -- of the address.

      -- ###########################################################
      --            X.25 Administration Table
      -- ###########################################################

      x25AdmnTable OBJECT-TYPE

              SYNTAX  SEQUENCE OF X25AdmnEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "This table contains the administratively
                      set configuration parameters for an X.25
                      Packet Level Entity (PLE).

                     Most of the objects in this table have
                      corresponding objects in the x25OperTable.
                      This table contains the values as last set
                      by the administrator.  The x25OperTable
                      contains the values actually in use by an
                      X.25 PLE.

                      Changing an administrative value may or may
                      not change a current operating value.  The
                      operating value may not change until the
                      interface is restarted.  Some
                      implementations may change the values
                      immediately upon changing the administrative
                      table.  All implementations are required to
                      load the values from the administrative
                      table when initializing a PLE."
              ::= { x25 1 }

      x25AdmnEntry OBJECT-TYPE
              SYNTAX  X25AdmnEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Entries of x25AdmnTable."
              INDEX { x25AdmnIndex }
              ::= { x25AdmnTable 1 }

      X25AdmnEntry ::= SEQUENCE {
              x25AdmnIndex
                      IfIndexType,
              x25AdmnInterfaceMode
                      INTEGER,
              x25AdmnMaxActiveCircuits
                      INTEGER,
              x25AdmnPacketSequencing
                      INTEGER,
              x25AdmnRestartTimer
                      PositiveInteger,
           x25AdmnCallTimer
                      PositiveInteger,

              x25AdmnResetTimer
                      PositiveInteger,
              x25AdmnClearTimer
                      PositiveInteger,
              x25AdmnWindowTimer
                      PositiveInteger,
              x25AdmnDataRxmtTimer
                      PositiveInteger,
              x25AdmnInterruptTimer
                      PositiveInteger,
              x25AdmnRejectTimer
                      PositiveInteger,
              x25AdmnRegistrationRequestTimer
                      PositiveInteger,
              x25AdmnMinimumRecallTimer
                      PositiveInteger,
              x25AdmnRestartCount
                      INTEGER,
              x25AdmnResetCount
                      INTEGER,
              x25AdmnClearCount
                      INTEGER,
              x25AdmnDataRxmtCount
                      INTEGER,
              x25AdmnRejectCount
                      INTEGER,
              x25AdmnRegistrationRequestCount
                      INTEGER,
              x25AdmnNumberPVCs
                      INTEGER,
              x25AdmnDefCallParamId
                      OBJECT IDENTIFIER,
              x25AdmnLocalAddress
                      X121Address,
              x25AdmnProtocolVersionSupported
                      OBJECT IDENTIFIER
              }

      x25AdmnIndex OBJECT-TYPE
              SYNTAX  IfIndexType
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
              "The ifIndex value for the X.25 Interface."
              ::= { x25AdmnEntry 1 }

      x25AdmnInterfaceMode OBJECT-TYPE
              SYNTAX  INTEGER {

                              dte (1),
                              dce (2),
                              dxe (3)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Identifies DCE/DTE mode in which the
                      interface operates.  A value of dxe
                      indicates the mode will be determined by XID
                      negotiation."
              REFERENCE "10733 5.9 interfaceMode"
              ::= { x25AdmnEntry 2 }

      x25AdmnMaxActiveCircuits        OBJECT-TYPE
              SYNTAX  INTEGER (0..4096)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The maximum number of circuits this PLE can
                      support; including PVCs."
              REFERENCE "10733 5.9 maxActiveCircuits;
                      See ISO 8208, Section 3.7"
              ::= { x25AdmnEntry 3 }

      x25AdmnPacketSequencing OBJECT-TYPE
              SYNTAX  INTEGER {
                              modulo8 (1),
                              modulo128 (2)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The modulus of the packet sequence number
                      space."
              REFERENCE "10733 extendedPacketSequencing;
                      See ISO 8208 Section 7.1.1"
              ::= { x25AdmnEntry 4 }

      x25AdmnRestartTimer OBJECT-TYPE
           SYNTAX     PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T20 restart timer in milliseconds."
              REFERENCE "10733 5.9 restartTime
                      See ISO 8208 Section 4.1, table 26"
              ::= { x25AdmnEntry 5 }

      x25AdmnCallTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T21 Call timer in milliseconds."
              REFERENCE "10733 callTime;
                      See ISO 8208 Section 5.2.1, table 26"
              ::= { x25AdmnEntry 6 }

      x25AdmnResetTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T22 Reset timer in milliseconds."
              REFERENCE "10733 resetTime;
                      See ISO 8208 Section 8.1, table 26"
              ::= { x25AdmnEntry 7 }

      x25AdmnClearTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T23 Clear timer in milliseconds."
              REFERENCE "10733 clearTime;
                      See ISO 8208 Section 5.5.1, table 26"
              ::= { x25AdmnEntry 8 }

      x25AdmnWindowTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T24 window status transmission timer in
                      milliseconds.  A value of 2147483647
                      indicates no window timer in use."
              REFERENCE "10733 5.10.1 windowTime (opt);
                      See ISO 8208 Section 11.2.2, table 26"
              ::= { x25AdmnEntry 9 }

      x25AdmnDataRxmtTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T25 data retransmission timer in

                      milliseconds.  A value of 2147483647
                      indicates no data retransmission timer in
                      use."
              REFERENCE "10733 5.10.1 dataRetransmissionTime (opt);
                      See ISO 8208 Section 11.2.1, table 26"
              ::= { x25AdmnEntry 10 }

      x25AdmnInterruptTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T26 interrupt timer in milliseconds.  A
                      value of 2147483647 indicates no interrupt
                      timer in use."
              REFERENCE "10733 interruptTime;
                      See ISO 8208 Section 6.8.1, table 26"
              ::= { x25AdmnEntry 11 }

      x25AdmnRejectTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T27 Reject retransmission timer in
                      milliseconds.  A value of 2147483647
                      indicates no reject timer in use."
              REFERENCE "10733 5.10.1 dataRejectTime (opt);
                      See ISO 8208 Section 13.4.1, table 26"
              ::= { x25AdmnEntry 12 }

      x25AdmnRegistrationRequestTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The T28 registration timer in milliseconds.
                      A value of 2147483647 indicates no
                      registration timer in use."
              REFERENCE "10733 5.8.1 registrationRequestTime (opt)
                      See ISO 8208    Section 13.1.1.1, table 26"
              ::= { x25AdmnEntry 13 }

      x25AdmnMinimumRecallTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION

                      "Minimum time interval between unsuccessful
                      call attempts in milliseconds."
              REFERENCE "10733 5.9 minimum RecallTimer"
              ::= { x25AdmnEntry 14 }

      x25AdmnRestartCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The R20 restart retransmission count."
              REFERENCE "10733 5.9 restartCount;
                      See ISO 8208    Section 4.1, table 27"
              ::= { x25AdmnEntry 15 }

      x25AdmnResetCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The r22 Reset retransmission count."
              REFERENCE "10733 resetCount;
                      See section ISO 8208 8.1, table 27"
              ::= { x25AdmnEntry 16 }

      x25AdmnClearCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
              "The r23 Clear retransmission count."
              REFERENCE "10733 clearCount;
                      See ISO 8208 Section 5.5.1, table 27"
              ::= { x25AdmnEntry 17 }

      x25AdmnDataRxmtCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The R25 Data retransmission count.  This
                      value is irrelevant if the
                      x25AdmnDataRxmtTimer indicates no timer in
                      use."
              REFERENCE "10733 5.10.1 dataRetransmissionCount (opt)
                      See ISO 8208 Section 11.2.1, table 27"
              ::= { x25AdmnEntry 18 }

      x25AdmnRejectCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The R27 reject retransmission count.  This
                      value is irrelevant if the
                      x25AdmnRejectTimer indicates no timer in
                      use."
              REFERENCE "10733 5.10.1 dataRejectCount (opt)"
              ::= { x25AdmnEntry 19 }

      x25AdmnRegistrationRequestCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The R28 Registration retransmission Count.
                      This value is irrelevant if the
                      x25AdmnRegistrationRequestTimer indicates no
                      timer in use."
              REFERENCE "10733 5.8.1 registrationRequestCount (opt);
                      See ISO 8208    Section 13.1.1.1, table 27"
              ::= { x25AdmnEntry 20 }

      x25AdmnNumberPVCs OBJECT-TYPE
              SYNTAX  INTEGER (0..4096)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The number of PVC configured for this PLE.
                      The PVCs use channel numbers from 1 to this
                      number."
              ::= { x25AdmnEntry 21 }

      x25AdmnDefCallParamId OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "This identifies the instance of the
                      x25CallParmIndex for the entry in the
                      x25CallParmTable which contains the default
                      call parameters for this PLE."
              ::= { x25AdmnEntry 22 }

      x25AdmnLocalAddress OBJECT-TYPE
              SYNTAX  X121Address

              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The local address for this PLE subnetwork.
                      A zero length address maybe returned by PLEs
                      that only support PVCs."
              REFERENCE "10733 5.9 localDTEAddress"
              ::= { x25AdmnEntry 23 }

      x25AdmnProtocolVersionSupported OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Identifies the version of the X.25 protocol
                      this interface should support.  Object
                      identifiers for common versions are defined
                      below in the x25ProtocolVersion subtree."
              REFERENCE "10733 5.9 protocolVersionSupported"
              ::= { x25AdmnEntry 24 }

      -- ###########################################################
      --            X.25 Operational Table
      -- ###########################################################

      x25OperTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF X25OperEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "The operation parameters in use by the X.25
                      PLE."
              ::= { x25 2 }

      x25OperEntry OBJECT-TYPE
              SYNTAX  X25OperEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Entries of x25OperTable."
              INDEX { x25OperIndex }
              ::= { x25OperTable 1 }

      X25OperEntry ::= SEQUENCE {
              x25OperIndex
                      IfIndexType,
              x25OperInterfaceMode

                      INTEGER,
              x25OperMaxActiveCircuits
                      INTEGER,
              x25OperPacketSequencing
                      INTEGER,
              x25OperRestartTimer
                      PositiveInteger,
              x25OperCallTimer
                      PositiveInteger,
              x25OperResetTimer
                      PositiveInteger,
              x25OperClearTimer
                      PositiveInteger,
              x25OperWindowTimer
                      PositiveInteger,
              x25OperDataRxmtTimer
                      PositiveInteger,
              x25OperInterruptTimer
                      PositiveInteger,
              x25OperRejectTimer
                      PositiveInteger,
           x25OperRegistrationRequestTimer
                      PositiveInteger,
              x25OperMinimumRecallTimer
                      PositiveInteger,
              x25OperRestartCount
                      INTEGER,
              x25OperResetCount
                      INTEGER,
              x25OperClearCount
                      INTEGER,
              x25OperDataRxmtCount
                      INTEGER,
              x25OperRejectCount
                      INTEGER,
              x25OperRegistrationRequestCount
                      INTEGER,
              x25OperNumberPVCs
                      INTEGER,
              x25OperDefCallParamId
                      OBJECT IDENTIFIER,
              x25OperLocalAddress
                      X121Address,
              x25OperDataLinkId
                      OBJECT IDENTIFIER,
              x25OperProtocolVersionSupported
                      OBJECT IDENTIFIER
              }

      x25OperIndex OBJECT-TYPE
              SYNTAX  IfIndexType
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The ifIndex value for the X.25 interface."
              ::= { x25OperEntry 1 }

      x25OperInterfaceMode OBJECT-TYPE
              SYNTAX  INTEGER {
                              dte (1),
                              dce (2),
                              dxe (3)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
              "Identifies DCE/DTE mode in which the
                      interface operates.  A value of dxe
                      indicates the role will be determined by XID
                      negotiation at the Link Layer and that
                      negotiation has not yet taken place."
              REFERENCE "10733 5.9 interfaceMode"
              ::= { x25OperEntry 2 }

      x25OperMaxActiveCircuits        OBJECT-TYPE
              SYNTAX  INTEGER (0..4096)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "Maximum number of circuits this PLE can
                      support."
              REFERENCE "10733 5.9 maxActiveCircuits
                      See ISO 8208, Section 3.7"
              ::= { x25OperEntry 3 }

      x25OperPacketSequencing OBJECT-TYPE
              SYNTAX  INTEGER {
                              modulo8 (1),
                              modulo128 (2)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The modulus of the packet sequence number
                      space."
              REFERENCE "10733 extendedPacketSequencing;
                      See ISO 8208    Section 7.1.1"

              ::= { x25OperEntry 4 }

      x25OperRestartTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The T20 restart timer in milliseconds."
              REFERENCE "10733 5.9 restartTime;
                      See ISO 8208    Section 4.1, table 26"
              ::= { x25OperEntry 5 }

      x25OperCallTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The T21 Call timer in milliseconds."
              REFERENCE "10733 callTime;
                      See ISO 8208 Section 5.2.1, table 26"
              ::= { x25OperEntry 6 }

      x25OperResetTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The T22 Reset timer in milliseconds."
              REFERENCE "10733 resetTime;
                      See ISO 8208    Section 8.1, table 26"
              ::= { x25OperEntry 7 }

      x25OperClearTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The T23 Clear timer in milliseconds."
              REFERENCE "10733 clearTime;
                      See ISO 8208 Section 5.5.1, table 26"
              ::= { x25OperEntry 8 }

      x25OperWindowTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The T24 window status transmission timer

                      milliseconds.  A value of 2147483647
                      indicates no window timer in use."
              REFERENCE "10733 5.10.1 windowTime (opt);
                      See ISO 8208 Section 11.2.2, table 26"
              ::= { x25OperEntry 9 }

      x25OperDataRxmtTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The T25 Data Retransmission timer in
                      milliseconds.  A value of 2147483647
                      indicates no data retransmission timer in
                      use."
              REFERENCE "10733 5.10.1 dataRetransmissionTime (opt);
                      See ISO 8208 Section 11.2.1, table 26"
              ::= { x25OperEntry 10 }

      x25OperInterruptTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The T26 Interrupt timer in milliseconds.  A
                      value of 2147483647 indicates interrupts are
                      not being used."
              REFERENCE "10733 interruptTime;
                      See ISO 8208 Section 6.8.1, table 26"
              ::= { x25OperEntry 11 }

      x25OperRejectTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The T27 Reject retransmission timer in
                      milliseconds.  A value of 2147483647
                      indicates no reject timer in use."
              REFERENCE "10733 5.10.1 dataRejectTime (opt);
                      See ISO 8208 Section 13.4.1, table 26"
              ::= { x25OperEntry 12 }

      x25OperRegistrationRequestTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION

                      "The T28 registration timer in milliseconds.
                      A value of 2147483647 indicates no
                      registration timer in use."
              REFERENCE "10733 5.8.1 registrationRequestTime (opt);
                      See ISO 8208    Section 13.1.1.1, table 26"
              ::= { x25OperEntry 13 }

      x25OperMinimumRecallTimer OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "Minimum time interval between unsuccessful
                      call attempts in milliseconds."
              REFERENCE "10733 5.9 minimum RecallTimer"
              ::= { x25OperEntry 14 }

      x25OperRestartCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The R20 restart retransmission count."
              REFERENCE "10733 5.9 restartCount
                      See ISO 8208    Section 4.1, table 27"
              ::= { x25OperEntry 15 }

      x25OperResetCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The r22 Reset retransmission count."
              REFERENCE "10733 resetCount;
                      See section ISO 8208 8.1, table 27"
              ::= { x25OperEntry 16 }

      x25OperClearCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The r23 Clear retransmission count."
              REFERENCE "10733 clearCount;
                      See ISO 8208 Section 5.5.1, table 27"
              ::= { x25OperEntry 17 }

      x25OperDataRxmtCount OBJECT-TYPE

              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The R25 Data retransmission count.  This
                      value is undefined if the
                      x25OperDataRxmtTimer indicates no timer in
                      use."
              REFERENCE "10733 5.10.1 dataRetransmissionCount (opt);
                      See ISO 8208 Section 11.2.1, table 27"
              ::= { x25OperEntry 18 }

      x25OperRejectCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The R27 reject retransmission count.  This
                      value is undefined if the x25OperRejectTimer
                      indicates no timer in use."
              REFERENCE "10733 5.10.1 dataRejectCount (opt)"
              ::= { x25OperEntry 19 }

      x25OperRegistrationRequestCount OBJECT-TYPE
              SYNTAX  INTEGER (0..65535)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The R28 Registration retransmission Count.
                      This value is undefined if the
                      x25OperREgistrationRequestTimer indicates no
                      timer in use."
              REFERENCE "10733 5.8.1 registrationRequestCount (opt);
                      See ISO 8208    Section 13.1.1.1, table 27"
              ::= { x25OperEntry 20 }

      x25OperNumberPVCs OBJECT-TYPE
              SYNTAX  INTEGER (0..4096)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of PVC configured for this PLE.
                      The PVCs use channel numbers from 1 to this
                      number."
              ::= { x25OperEntry 21 }

      x25OperDefCallParamId OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER

              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "This identifies the instance of the
                      x25CallParmIndex for the entry in the
                      x25CallParmTable that contains the default
                      call parameters for this PLE."
              ::= { x25OperEntry 22 }

      x25OperLocalAddress OBJECT-TYPE
              SYNTAX  X121Address
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The local address for this PLE subnetwork.
                      A zero length address maybe returned by PLEs
                      that only support PVCs."
              REFERENCE "10733 5.9 localDTEAddress"
              ::= { x25OperEntry 23 }

      x25OperDataLinkId OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "This identifies the instance of the index
                      object in the first table of the most device
                      specific MIB for the interface used by this
                      PLE."
              ::= { x25OperEntry 24 }

      x25OperProtocolVersionSupported OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "Identifies the version of the X.25 protocol
                      this interface supports.  Object identifiers
                      for common versions are defined below in the
                      x25ProtocolVersion subtree."
              REFERENCE "10733 5.9 protocolVersionSupported"
              ::= { x25OperEntry 25 }

      --      MIB-II also provides:

      -- ifDescr:
      -- On an X.25 interface this must include sufficient

      -- information to enable the system's administrator
      -- to determine the appropriate configuration
      -- information on a system having multiple X.25
      -- subnetworks.

      -- ifType: ddn-x25 or rfc877-x25
      --      an interface of type ddn-x25 will use an algorithm to
      --      translate between X.121 address and IP addresses.
      --      An interface of type rfc877-x25 will use a
      --      configuration table to translate between X.121
      --      addresses and IP addresses.

      -- ifMtu: the maximum PDU a higher layer can pass to X.25 or
      -- receive from X.25

      -- ifSpeed:
      -- This will be the value of the local clock for this line.
      -- A value of zero indicates external clocking.

      -- ifAdminStatus:

      -- ifOperStatus

      -- ifLastChange

      -- ###########################################################
      --            X.25 Statistics Table
      -- ###########################################################

      x25StatTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF X25StatEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Statistics information about this X.25
                      PLE."
              ::= { x25 3 }

      x25StatEntry OBJECT-TYPE
              SYNTAX  X25StatEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                       "Entries of the x25StatTable."
                       INDEX { x25StatIndex }
              ::= { x25StatTable 1 }

      X25StatEntry ::= SEQUENCE {
              x25StatIndex
                      IfIndexType,
              x25StatInCalls
                      Counter,
              x25StatInCallRefusals
                      Counter,
              x25StatInProviderInitiatedClears
                      Counter,
              x25StatInRemotelyInitiatedResets
                      Counter,
              x25StatInProviderInitiatedResets
                      Counter,
              x25StatInRestarts
                      Counter,
              x25StatInDataPackets
                      Counter,
              x25StatInAccusedOfProtocolErrors
                      Counter,
              x25StatInInterrupts
                      Counter,
              x25StatOutCallAttempts
                      Counter,
              x25StatOutCallFailures
                      Counter,
              x25StatOutInterrupts
                      Counter,
              x25StatOutDataPackets
                      Counter,
              x25StatOutgoingCircuits
                      Gauge,
              x25StatIncomingCircuits
                      Gauge,
              x25StatTwowayCircuits
                      Gauge,
              x25StatRestartTimeouts
                      Counter,
              x25StatCallTimeouts
                      Counter,
              x25StatResetTimeouts
                      Counter,
              x25StatClearTimeouts
                      Counter,
              x25StatDataRxmtTimeouts
                      Counter,
              x25StatInterruptTimeouts
                      Counter,
              x25StatRetryCountExceededs

                      Counter,
              x25StatClearCountExceededs
                      Counter
              }

      x25StatIndex OBJECT-TYPE
              SYNTAX  IfIndexType
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The ifIndex value for the X.25 interface."
              ::= { x25StatEntry 1 }

      x25StatInCalls OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of incoming calls received."
              ::= { x25StatEntry 2 }

      x25StatInCallRefusals OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of incoming calls refused.  This
                      includes calls refused by the PLE and by
                      higher layers.  This also includes calls
                      cleared because of restricted fast select."
              ::= { x25StatEntry 3 }

      x25StatInProviderInitiatedClears        OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of clear requests with a cause
                      code other than DTE initiated."
                      REFERENCE "10733 providerInitiatedDisconnect"
              ::= { x25StatEntry 4 }

      x25StatInRemotelyInitiatedResets        OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of reset requests received with

                      cause code DTE initiated."
              REFERENCE "10733 remotelyInitiatedResets"
              ::= { x25StatEntry 5 }

      x25StatInProviderInitiatedResets        OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of reset requests received with
                      cause code other than DTE initiated."
              REFERENCE "10733 ProviderInitiatedResets"
              ::= { x25StatEntry 6 }

      x25StatInRestarts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of remotely initiated (including
                      provider initiated) restarts experienced by
                      the PLE excluding the restart associated
                      with bringing up the PLE interface.  This
                      only counts restarts received when the PLE
                      already has an established connection with
                      the remove PLE."
              REFERENCE "10733 5.9 remotelyInitiatedRestarts"
              ::= { x25StatEntry 7 }

      x25StatInDataPackets    OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of data packets received."
                      REFERENCE "10733 5.9 dataPacketsReceived."
              ::= { x25StatEntry 8 }

      x25StatInAccusedOfProtocolErrors        OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of packets received containing a
                      procedure error cause code.  These include
                      clear, reset, restart, or diagnostic
                      packets."
              REFERENCE "CD 10733 5.9 accusedOfProtocolError"

              ::= { x25StatEntry 9 }

      x25StatInInterrupts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of interrupt packets received by
                      the PLE or over the PVC/VC."
              REFERENCE "10733 interruptPacketsReceived"
              ::= { x25StatEntry 10 }

      x25StatOutCallAttempts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of calls attempted."
              REFERENCE "10733 5.9 callAttempts"
              ::= { x25StatEntry 11 }

      x25StatOutCallFailures OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of call attempts which failed.
                      This includes calls that were cleared
                      because of restrictive fast select."
              ::= { x25StatEntry 12 }

      x25StatOutInterrupts    OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of interrupt packets send by the
                      PLE or over the PVC/VC."
              REFERENCE "10733 InterruptPacketsSent"
              ::= { x25StatEntry 13 }

      x25StatOutDataPackets   OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of data packets sent by this
                      PLE."

              REFERENCE "10733 dataPacketSent"
              ::= { x25StatEntry 14 }

      x25StatOutgoingCircuits OBJECT-TYPE
              SYNTAX  Gauge
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of active outgoing circuits.
                      This includes call requests sent but not yet
                      confirmed.  This does not count PVCs."
              ::= { x25StatEntry 15 }

      x25StatIncomingCircuits OBJECT-TYPE
              SYNTAX  Gauge
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of active Incoming Circuits.
                      This includes call indications received but
                      not yet acknowledged.  This does not count
                      PVCs."
              ::= { x25StatEntry 16 }

      x25StatTwowayCircuits   OBJECT-TYPE
              SYNTAX  Gauge
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
              "The number of active two-way Circuits.
                      This includes call requests sent but not yet
                      confirmed.  This does not count PVCs."
              ::= { x25StatEntry 17 }

      x25StatRestartTimeouts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the T20 restart timer
                      expired."
              REFERENCE "10733 5.9 restartTimeouts"
              ::= { x25StatEntry 18 }

      x25StatCallTimeouts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory

              DESCRIPTION
                      "The number of times the T21 call timer
                      expired."
              REFERENCE "10733 5.9 callTimeouts"
              ::= { x25StatEntry 19 }

      x25StatResetTimeouts    OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the T22 reset timer
                      expired."
              REFERENCE "10733 5.9 resetTimeouts"
              ::= { x25StatEntry 20 }

      x25StatClearTimeouts    OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the T23 clear timer
                      expired."
              REFERENCE "10733 5.9 clearTimeouts"
              ::= { x25StatEntry 21 }

      x25StatDataRxmtTimeouts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the T25 data timer
                      expired."
              REFERENCE "10733 5.9 dataRetransmissionsTimerExpiries"
              ::= { x25StatEntry 22 }

      x25StatInterruptTimeouts        OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the T26 interrupt timer
                      expired."
              REFERENCE "10733 5.9 interruptTimerExpires"
              ::= { x25StatEntry 23 }

      x25StatRetryCountExceededs OBJECT-TYPE
              SYNTAX  Counter

              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times a retry counter was
                      exhausted."
              REFERENCE "10733 5.9 retryCountsExceeded"
              ::= { x25StatEntry 24 }

      x25StatClearCountExceededs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the R23 clear count was
                      exceeded."
              REFERENCE "10733 5.9 clearCountsExceeded"
              ::= { x25StatEntry 25 }

      --      MIB-II also contains:

      -- ifInOctets: Number of data octets delivered to upper
      -- layer entities.

      -- ifInUcastPkts: Number of packets with a clear M-bit
      -- delivered to higher layer entities.

      -- ifDiscards: Number of packets dropped for lack of buffering

      -- ifInErrors: Number of packets received containing errors
        -- REFERENCE ProtocolErrorsDetectedLocally

      -- ifInUnknownProtos: Number of packets with unknown circuit
      -- identifier.

      -- ifOutOctets: Number of data octets delivered by
      --      X.25 to upper layers.

      -- ifOutUcastPkts: Number of packets with a clear M-bit
      -- received from higher layer entities.

      -- ###########################################################
      --                    X.25 Channel Table
      -- ###########################################################

      x25ChannelTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF X25ChannelEntry

              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "These objects contain information about the
                      channel number configuration in an X.25 PLE.
                      These values are the configured values.
                      changes in these values after the interfaces
                      has started may not be reflected in the
                      operating PLE."
              REFERENCE "See ISO 8208, Section 3.7"
              ::= { x25 4 }

      x25ChannelEntry OBJECT-TYPE
              SYNTAX  X25ChannelEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Entries of x25ChannelTable."
              REFERENCE "This provides the information available
                      in 10733 logicalChannelAssignments."
              INDEX { x25ChannelIndex }
              ::= { x25ChannelTable 1    }

      X25ChannelEntry ::= SEQUENCE {
              x25ChannelIndex
                      IfIndexType,
              x25ChannelLIC
                      INTEGER,
              x25ChannelHIC
                      INTEGER,
              x25ChannelLTC
                      INTEGER,
              x25ChannelHTC
                      INTEGER,
              x25ChannelLOC
                      INTEGER,
              x25ChannelHOC
                      INTEGER
              }

      x25ChannelIndex OBJECT-TYPE
              SYNTAX  IfIndexType
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The ifIndex value for the X.25 Interface."
              ::= { x25ChannelEntry 1 }

      x25ChannelLIC OBJECT-TYPE
              SYNTAX  INTEGER (0..4095)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Lowest Incoming channel."
              ::= { x25ChannelEntry 2 }

      x25ChannelHIC OBJECT-TYPE
              SYNTAX  INTEGER (0..4095)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Highest Incoming channel.  A value of zero
                      indicates no channels in this range."
              ::= { x25ChannelEntry 3 }

      x25ChannelLTC OBJECT-TYPE
              SYNTAX  INTEGER (0..4095)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Lowest Two-way channel."
              ::= { x25ChannelEntry 4 }

      x25ChannelHTC OBJECT-TYPE
              SYNTAX  INTEGER (0..4095)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Highest Two-way channel.  A value of zero
                      indicates no channels in this range."
              ::= { x25ChannelEntry 5 }

      x25ChannelLOC OBJECT-TYPE
              SYNTAX  INTEGER (0..4095)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Lowest outgoing channel."
              ::= { x25ChannelEntry 6 }

      x25ChannelHOC OBJECT-TYPE
              SYNTAX  INTEGER (0..4095)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Highest outgoing channel.  A value of zero

                      indicates no channels in this range."
              ::= { x25ChannelEntry 7 }

      -- ###########################################################
      --          X25 Per Circuits Information Table
      -- ###########################################################

      x25CircuitTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF X25CircuitEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "These objects contain general information
                      about a specific circuit of an X.25 PLE."
              ::= { x25 5 }

      x25CircuitEntry OBJECT-TYPE
              SYNTAX  X25CircuitEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Entries of x25CircuitTable."
              INDEX { x25CircuitIndex,
                      x25CircuitChannel }
              ::= { x25CircuitTable 1 }

      X25CircuitEntry ::= SEQUENCE {
              x25CircuitIndex
                      IfIndexType,
              x25CircuitChannel
                      INTEGER,
              x25CircuitStatus
                      INTEGER,
              x25CircuitEstablishTime
                      TimeTicks,
              x25CircuitDirection
                      INTEGER,
              x25CircuitInOctets
                      Counter,
              x25CircuitInPdus
                      Counter,
              x25CircuitInRemotelyInitiatedResets
                      Counter,
              x25CircuitInProviderInitiatedResets
                      Counter,

              x25CircuitInInterrupts
                      Counter,
              x25CircuitOutOctets
                      Counter,
              x25CircuitOutPdus
                      Counter,
              x25CircuitOutInterrupts
                      Counter,
              x25CircuitDataRetransmissionTimeouts
                      Counter,
              x25CircuitResetTimeouts
                      Counter,
              x25CircuitInterruptTimeouts
                      Counter,
              x25CircuitCallParamId
                      OBJECT IDENTIFIER,
              x25CircuitCalledDteAddress
                      X121Address,
              x25CircuitCallingDteAddress
                      X121Address,
              x25CircuitOriginallyCalledAddress
                      X121Address,
              x25CircuitDescr
                      DisplayString
              }

      x25CircuitIndex OBJECT-TYPE
              SYNTAX  IfIndexType
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The ifIndex value for the X.25 Interface."
              ::= { x25CircuitEntry 1 }

      x25CircuitChannel OBJECT-TYPE
              SYNTAX  INTEGER (0..4095)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The channel number for this circuit."
              ::= { x25CircuitEntry 2 }

      x25CircuitStatus OBJECT-TYPE
              SYNTAX  INTEGER {               -- state table states
                              invalid (1),
                              closed (2),             -- (p1)
                              calling (3),            -- (p2,p3,p5)
                              open (4),               -- (p4)

                              clearing (5),           -- (p6,p7)
                              pvc (6),
                              pvcResetting (7),
                              startClear (8),         -- Close cmd
                              startPvcResetting (9),  -- Reset cmd
                              other (10)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "This object reports the current status of
                      the circuit.

                      An existing instance of this object can only
                      be set to startClear, startPvcResetting, or
                      invalid.  An instance with the value calling
                      or open can only be set to startClear and
                      that action will start clearing the circuit.
                      An instance with the value PVC can only be
                      set to startPvcResetting or invalid and that
                      action resets the PVC or deletes the circuit
                      respectively.  The values startClear or
                      startPvcResetting will never be returned by
                      an agent.  An attempt to set the status of
                      an existing instance to a value other than
                      one of these values will result in an error.

                      A non-existing instance can be set to PVC to
                      create a PVC if the implementation supports
                      dynamic creation of PVCs.  Some
                      implementations may only allow creation and
                      deletion of PVCs if the interface is down.
                      Since the instance identifier will supply
                      the PLE index and the channel number,
                      setting this object alone supplies
                      sufficient information to create the
                      instance.  All the DEFVAL clauses for the
                      other objects of this table are appropriate
                      for creating a PVC; PLEs creating entries
                      for placed or accepted calls will use values
                      appropriate for the call rather than the
                      value of the DEFVAL clause.  Two managers
                      trying to create the same PVC can determine
                      from the return code which manager succeeded
                      and which failed (the failing manager fails
                      because it can not set a value of PVC for an
                      existing object).

                      An entry in the closed or invalid state may
                      be deleted or reused at the agent's
                      convence.  If the entry is kept in the
                      closed state, the values of the parameters
                      associated with the entry must be correct.
                      Closed implies the values in the circuit
                      table are correct.

                      The value of invalid indicates the other
                      values in the table are invalid.  Many
                      agents may never return a value of invalid
                      because they dynamically allocate and free
                      unused table entries.  An agent for a
                      statically configured systems can return
                      invalid to indicate the entry has not yet
                      been used so the counters contain no
                      information."
              REFERENCE "See ISO 8208,
                              table 33 for (p<n>) state table"
              ::= { x25CircuitEntry 3 }

      x25CircuitEstablishTime OBJECT-TYPE
              SYNTAX  TimeTicks
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The value of sysUpTime when the channel was
                      associated with this circuit.  For outgoing
                      SVCs, this is the time the first call packet
                      was sent.  For incoming SVCs, this is the
                      time the call indication was received.  For
                      PVCs this is the time the PVC was able to
                      pass data to a higher layer entity without
                      loss of data."
              ::= { x25CircuitEntry 4 }

      x25CircuitDirection OBJECT-TYPE
              SYNTAX  INTEGER {
                              incoming (1),
                              outgoing (2),
                              pvc (3)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The direction of the call that established
                      this circuit."
              REFERENCE "10733 direction"

              DEFVAL { pvc }
              ::= { x25CircuitEntry 5 }

                      -- X25 Circuit data flow statistics

      x25CircuitInOctets OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of octets of user data delivered
                      to upper layer."
              REFERENCE "5.11 octetsReceivedCounter"
              ::= { x25CircuitEntry 6 }

      x25CircuitInPdus OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of PDUs received for this
                      circuit."
              REFERENCE "10733 5.11 dataPacketsReceived"
              ::= { x25CircuitEntry 7 }

      x25CircuitInRemotelyInitiatedResets OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of Resets received for this
                      circuit with cause code of DTE initiated."
              REFERENCE "10733 remotelyInitiatedResets"
              ::= { x25CircuitEntry 8 }

      x25CircuitInProviderInitiatedResets OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of Resets received for this
                      circuit with cause code other than DTE
                      initiated."
              REFERENCE "10733 ProviderInitiatedResets"
              ::= { x25CircuitEntry 9 }

      x25CircuitInInterrupts OBJECT-TYPE
              SYNTAX  Counter

              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of interrupt packets received
                      for this circuit."
              REFERENCE "10733 interruptPacketsReceived"
              ::= { x25CircuitEntry 10 }

      x25CircuitOutOctets OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of octets of user data sent for
                      this circuit."
              REFERENCE "10733 5.11 octetsSentCounter"
              ::= { x25CircuitEntry 11 }

      x25CircuitOutPdus OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of PDUs sent for this circuit."
              REFERENCE "10733 5.11 dataPacketsSent"
              ::= { x25CircuitEntry 12 }

      x25CircuitOutInterrupts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of interrupt packets sent on
                      this circuit."
              REFERENCE "10733 interruptPacketsSent"
              ::= { x25CircuitEntry 13 }

                      -- X25 circuit timer statistics

      x25CircuitDataRetransmissionTimeouts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the T25 data
                      retransmission timer expired for this
                      circuit."

              REFERENCE "10733 5.11 dataRetransmissionTimerExpiries"
              ::= { x25CircuitEntry 14 }

      x25CircuitResetTimeouts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the T22 reset timer
                      expired for this circuit."
              REFERENCE "10733 5.11 resetTimeouts"
              ::= { x25CircuitEntry 15 }

      x25CircuitInterruptTimeouts OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of times the T26 Interrupt timer
                      expired for this circuit."
              REFERENCE "10733 interruptTimerExpiries"
              ::= { x25CircuitEntry 16 }

      x25CircuitCallParamId OBJECT-TYPE
              SYNTAX  OBJECT IDENTIFIER
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "This identifies the instance of the
                      x25CallParmIndex for the entry in the
                      x25CallParmTable which contains the call
                      parameters in use with this circuit.  The
                      entry referenced must contain the values
                      that are currently in use by the circuit
                      rather than proposed values.  A value of
                      NULL indicates the circuit is a PVC or is
                      using all the default parameters."
              DEFVAL { {0 0} }
              ::= { x25CircuitEntry 17 }

      x25CircuitCalledDteAddress OBJECT-TYPE
              SYNTAX  X121Address
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "For incoming calls, this is the called
                      address from the call indication packet.
                      For outgoing calls, this is the called

                      address from the call confirmation packet.
                      This will be zero length for PVCs."
              REFERENCE "10733 calledDTEAddress"
              DEFVAL { h }
              ::= { x25CircuitEntry 18 }

      x25CircuitCallingDteAddress OBJECT-TYPE
              SYNTAX  X121Address
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "For incoming calls, this is the calling
                      address from the call indication packet.
                      For outgoing calls, this is the calling
                      address from the call confirmation packet.
                      This will be zero length for PVCs."
              REFERENCE "10733 callingDTEAddress"
              DEFVAL { h }
              ::= { x25CircuitEntry 19 }

      x25CircuitOriginallyCalledAddress OBJECT-TYPE
              SYNTAX  X121Address
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "For incoming calls, this is the address in
                      the call Redirection or Call Deflection
                      Notification facility if the call was
                      deflected or redirected, otherwise it will
                      be called address from the call indication
                      packet.  For outgoing calls, this is the
                      address from the call request packet.  This
                      will be zero length for PVCs."
              REFERENCE "10733 originallyCalledAddress"
              DEFVAL { h }
              ::= { x25CircuitEntry 20 }

      x25CircuitDescr OBJECT-TYPE
              SYNTAX  DisplayString (SIZE (0..255))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "A descriptive string associated with this
                      circuit.  This provides a place for the
                      agent to supply any descriptive information
                      it knows about the use or owner of the
                      circuit.  The agent may return the process
                      identifier and user name for the process

                      using the circuit.  Alternative the agent
                      may return the name of the configuration
                      entry that caused a bridge to establish the
                      circuit.  A zero length value indicates the
                      agent doesn't have any additional
                      information."
              DEFVAL { h }
              ::= { x25CircuitEntry 21 }

      -- ###########################################################
      --              The Cleared Circuit Table
      -- ###########################################################

      x25ClearedCircuitEntriesRequested OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The requested number of entries for the
                      agent to keep in the x25ClearedCircuit
                      table."
              ::= { x25 6 }

      x25ClearedCircuitEntriesGranted OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The actual number of entries the agent will
                      keep in the x25ClearedCircuit Table."
              ::= { x25 7 }

      x25ClearedCircuitTable  OBJECT-TYPE
              SYNTAX SEQUENCE OF      X25ClearedCircuitEntry
              ACCESS not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "A table of entries about closed circuits.
                      Entries must be made in this table whenever
                      circuits are closed and the close request or
                      close indication packet contains a clearing
                      cause other than DTE Originated or a
                      Diagnostic code field other than Higher
                      Layer Initiated disconnection-normal.  An
                      agent may optionally make entries for normal
                      closes (to record closing facilities or

                      other information).

                      Agents will delete the oldest entry in the
                      table when adding a new entry would exceed
                      agent resources.  Agents are required to
                      keep the last entry put in the table and may
                      keep more entries.  The object
                      x25OperClearEntriesGranted returns the
                      maximum number of entries kept in the
                      table."
              REFERENCE "See ISO 8208 Section 12.2.3.1.1
                              and 12.2.3.1.2"
              ::= { x25 8 }

      x25ClearedCircuitEntry  OBJECT-TYPE
              SYNTAX  X25ClearedCircuitEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Information about a cleared circuit."
              INDEX { x25ClearedCircuitIndex }
              ::= { x25ClearedCircuitTable 1 }

      X25ClearedCircuitEntry ::= SEQUENCE {
              x25ClearedCircuitIndex
                      PositiveInteger,
              x25ClearedCircuitPleIndex
                      IfIndexType,
              x25ClearedCircuitTimeEstablished
                      TimeTicks,
              x25ClearedCircuitTimeCleared
                      TimeTicks,
              x25ClearedCircuitChannel
                      INTEGER,
              x25ClearedCircuitClearingCause
                      INTEGER,
              x25ClearedCircuitDiagnosticCode
                      INTEGER,
              x25ClearedCircuitInPdus
                      Counter,
              x25ClearedCircuitOutPdus
                      Counter,
              x25ClearedCircuitCalledAddress
                      X121Address,
              x25ClearedCircuitCallingAddress
                      X121Address,
              x25ClearedCircuitClearFacilities
                      OCTET STRING

              }

      x25ClearedCircuitIndex OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "An index that uniquely distinguishes one
                      entry in the clearedCircuitTable from
                      another.  This index will start at
                      2147483647 and will decrease by one for each
                      new entry added to the table.  Upon reaching
                      one, the index will reset to 2147483647.
                      Because the index starts at 2147483647 and
                      decreases, a manager may do a getnext on
                      entry zero and obtain the most recent entry.
                      When the index has the value of 1, the next
                      entry will delete all entries in the table
                      and that entry will be numbered 2147483647."
              ::= { x25ClearedCircuitEntry 1 }

      x25ClearedCircuitPleIndex OBJECT-TYPE
              SYNTAX  IfIndexType
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The value of ifIndex for the PLE which
                      cleared the circuit that created the entry."
              ::= { x25ClearedCircuitEntry 2 }

      x25ClearedCircuitTimeEstablished OBJECT-TYPE
              SYNTAX  TimeTicks
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The value of sysUpTime when the circuit was
                      established.  This will be the same value
                      that was in the x25CircuitEstablishTime for
                      the circuit."
              ::= { x25ClearedCircuitEntry 3 }

      x25ClearedCircuitTimeCleared OBJECT-TYPE
              SYNTAX  TimeTicks
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The value of sysUpTime when the circuit was
                      cleared.  For locally initiated clears, this

                      will be the time when the clear confirmation
                      was received.  For remotely initiated
                      clears, this will be the time when the clear
                      indication was received."
              ::= { x25ClearedCircuitEntry 4 }

      x25ClearedCircuitChannel OBJECT-TYPE
              SYNTAX  INTEGER (0..4095)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The channel number for the circuit that was
                      cleared."
              ::= { x25ClearedCircuitEntry 5 }

      x25ClearedCircuitClearingCause OBJECT-TYPE
              SYNTAX  INTEGER (0..255)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The Clearing Cause from the clear request
                      or clear indication packet that cleared the
                      circuit."
              REFERENCE "See ISO 8208 Section 12.2.3.1.1"
              ::= { x25ClearedCircuitEntry 6 }

      x25ClearedCircuitDiagnosticCode OBJECT-TYPE
              SYNTAX  INTEGER (0..255)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The Diagnostic Code from the clear request
                      or clear indication packet that cleared the
                      circuit."
              REFERENCE "See ISO 8208 Section 12.2.3.1.2"
              ::= { x25ClearedCircuitEntry 7 }

      x25ClearedCircuitInPdus OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of PDUs received on the
                      circuit."
              ::= { x25ClearedCircuitEntry 8 }

      x25ClearedCircuitOutPdus OBJECT-TYPE
              SYNTAX  Counter

              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of PDUs transmitted on the
                      circuit."
              ::= { x25ClearedCircuitEntry 9 }

      x25ClearedCircuitCalledAddress OBJECT-TYPE
              SYNTAX  X121Address
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The called address from the cleared
                      circuit."
              ::= { x25ClearedCircuitEntry 10 }

      x25ClearedCircuitCallingAddress OBJECT-TYPE
              SYNTAX  X121Address
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The calling address from the cleared
                      circuit."
              ::= { x25ClearedCircuitEntry 11 }

      x25ClearedCircuitClearFacilities OBJECT-TYPE
              SYNTAX  OCTET STRING (SIZE (0..109))
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The facilities field from the clear request
                      or clear indication packet that cleared the
                      circuit.  A size of zero indicates no
                      facilities were present."
              ::= { x25ClearedCircuitEntry 12 }

      -- ###########################################################
      --                The Call Parameter Table
      -- ###########################################################

      x25CallParmTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF X25CallParmEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION

                      "These objects contain the parameters that
                      can be varied between X.25 calls.  The
                      entries in this table are independent of the
                      PLE.  There exists only one of these tables
                      for the entire system.  The indexes for the
                      entries are independent of any PLE or any
                      circuit.  Other tables reference entries in
                      this table.  Entries in this table can be
                      used for default PLE parameters, for
                      parameters to use to place/answer a call,
                      for the parameters currently in use for a
                      circuit, or parameters that were used by a
                      circuit.

                      The number of references to a given set of
                      parameters can be found in the
                      x25CallParmRefCount object sharing the same
                      instance identifier with the parameters.
                      The value of this reference count also
                      affects the access of the objects in this
                      table.  An object in this table with the
                      same instance identifier as the instance
                      identifier of an x25CallParmRefCount must be
                      consider associated with that reference
                      count.  An object with an associated
                      reference count of zero can be written (if
                      its ACCESS clause allows it).  An object
                      with an associated reference count greater
                      than zero can not be written (regardless of
                      the ACCESS clause).  This ensures that a set
                      of call parameters being referenced from
                      another table can not be modified or changed
                      in a ways inappropriate for continued use by
                      that table."
              ::= { x25 9 }

      x25CallParmEntry OBJECT-TYPE
              SYNTAX  X25CallParmEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "Entries of x25CallParmTable."
              INDEX { x25CallParmIndex }
              ::= { x25CallParmTable 1 }

      X25CallParmEntry ::= SEQUENCE {
              x25CallParmIndex
                      PositiveInteger,

              x25CallParmStatus
                      EntryStatus,
              x25CallParmRefCount
                      PositiveInteger,
              x25CallParmInPacketSize
                      INTEGER,
              x25CallParmOutPacketSize
                      INTEGER,
              x25CallParmInWindowSize
                      INTEGER,
              x25CallParmOutWindowSize
                      INTEGER,
              x25CallParmAcceptReverseCharging
                      INTEGER,
              x25CallParmProposeReverseCharging
                      INTEGER,
              x25CallParmFastSelect
                      INTEGER,
              x25CallParmInThruPutClasSize
                      INTEGER,
              x25CallParmOutThruPutClasSize
                      INTEGER,
              x25CallParmCug
                      DisplayString,
              x25CallParmCugoa
                      DisplayString,
              x25CallParmBcug
                      DisplayString,
              x25CallParmNui
                      OCTET STRING,
              x25CallParmChargingInfo
                      INTEGER,
              x25CallParmRpoa
                      DisplayString,
              x25CallParmTrnstDly
                      INTEGER,
              x25CallParmCallingExt
                      DisplayString,
              x25CallParmCalledExt
                      DisplayString,
              x25CallParmInMinThuPutCls
                      INTEGER,
              x25CallParmOutMinThuPutCls
                      INTEGER,
              x25CallParmEndTrnsDly
                      OCTET STRING,
              x25CallParmPriority
                      OCTET STRING,

              x25CallParmProtection
                      DisplayString,
              x25CallParmExptData
                      INTEGER,
              x25CallParmUserData
                      OCTET STRING,
              x25CallParmCallingNetworkFacilities
                      OCTET STRING,
              x25CallParmCalledNetworkFacilities
                      OCTET STRING
              }

      x25CallParmIndex OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "A value that distinguishes this entry from
                      another entry.  Entries in this table are
                      referenced from other objects which identify
                      call parameters.

                      It is impossible to know which other objects
                      in the MIB reference entries in the table by
                      looking at this table.  Because of this,
                      changes to parameters must be accomplished
                      by creating a new entry in this table and
                      then changing the referencing table to
                      identify the new entry.

                      Note that an agent will only use the values
                      in this table when another table is changed
                      to reference those values.  The number of
                      other tables that reference an index object
                      in this table can be found in
                      x25CallParmRefCount.  The value of the
                      reference count will affect the writability
                      of the objects as explained above.

                      Entries in this table which have a reference
                      count of zero maybe deleted at the convence
                      of the agent.  Care should be taken by the
                      agent to give the NMS sufficient time to
                      create a reference to newly created entries.

                      Should a Management Station not find a free
                      index with which to create a new entry, it
                      may feel free to delete entries with a

                      reference count of zero.  However in doing
                      so the Management Station much realize it
                      may impact other Management Stations."
              ::= { x25CallParmEntry 1 }

      x25CallParmStatus OBJECT-TYPE
              SYNTAX  EntryStatus
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The status of this call parameter entry.
                      See RFC 1271 for details of usage."
              ::= { x25CallParmEntry 2 }

      x25CallParmRefCount OBJECT-TYPE
              SYNTAX  PositiveInteger
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of references know by a
                      management station to exist to this set of
                      call parameters.  This is the number of
                      other objects that have returned a value of,
                      and will return a value of, the index for
                      this set of call parameters.  Examples of
                      such objects are the x25AdmnDefCallParamId,
                      x25OperDataLinkId, or x25AdmnDefCallParamId
                      objects defined above."
              ::= { x25CallParmEntry 3 }

      x25CallParmInPacketSize OBJECT-TYPE
              SYNTAX  INTEGER (0..4096)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The maximum receive packet size in octets
                      for a circuit.  A size of zero for a circuit
                      means use the PLE default size.  A size of
                      zero for the PLE means use a default size of
                      128."
              REFERENCE "10733 proposedPacketSize;
                      See ISO 8208 Section 15.2.2.1.1"
              DEFVAL { 128 }
              ::= { x25CallParmEntry 4 }

      x25CallParmOutPacketSize OBJECT-TYPE
              SYNTAX  INTEGER (0..4096)
              ACCESS  read-write

              STATUS  mandatory
              DESCRIPTION
                      "The maximum transmit packet size in octets
                      for a circuit.  A size of zero for a circuit
                      means use the PLE default size.  A size of
                      zero for the PLE default means use a default
                      size of 128."
              REFERENCE "10733 proposedPacketSize;
                      See ISO 8208 Section 15.2.2.1.1"
              DEFVAL { 128 }
              ::= { x25CallParmEntry 5 }

      x25CallParmInWindowSize OBJECT-TYPE
              SYNTAX  INTEGER (0..127)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The receive window size for a circuit.  A
                      size of zero for a circuit means use the PLE
                      default size.  A size of zero for the PLE
                      default means use 2."
              REFERENCE "10733 proposedWindowSize;
                      See ISO 8208 Section 15.2.2.1.2"
              DEFVAL { 2 }
              ::= { x25CallParmEntry 6 }

      x25CallParmOutWindowSize OBJECT-TYPE
              SYNTAX  INTEGER (0..127)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The transmit window size for a circuit.  A
                      size of zero for a circuit means use the PLE
                      default size.  A size of zero for the PLE
                      default means use 2."
              REFERENCE "10733 proposedWindowSize;
                      See ISO 8208 Section 15.2.2.1.2"
              DEFVAL { 2 }
              ::= { x25CallParmEntry 7 }

      x25CallParmAcceptReverseCharging OBJECT-TYPE
              SYNTAX  INTEGER {
                              default (1),
                              accept (2),
                              refuse (3),
                              neverAccept (4)
                      }
              ACCESS  read-write

              STATUS  mandatory
              DESCRIPTION
                      "An enumeration defining if the PLE will
                      accept or refuse charges.  A value of
                      default for a circuit means use the PLE
                      default value.  A value of neverAccept is
                      only used for the PLE default and indicates
                      the PLE will never accept reverse charging.
                      A value of default for a PLE default means
                      refuse."
              REFERENCE "10733 acceptReverseCharging"
              DEFVAL { refuse }
              ::= { x25CallParmEntry 8 }

      x25CallParmProposeReverseCharging OBJECT-TYPE
              SYNTAX  INTEGER {
                              default (1),
                              reverse (2),
                              local (3)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "An enumeration defining if the PLE should
                      propose reverse or local charging.  The
                      value of default for a circuit means use the
                      PLE default.  The value of default for the
                      PLE default means use local."
              REFERENCE "10733 proposedPacketSize;
                      See ISO 8208 Section 15.2.2.6"
              DEFVAL { local }
              ::= { x25CallParmEntry 9 }

      x25CallParmFastSelect OBJECT-TYPE
              SYNTAX  INTEGER {
                              default (1),
                              notSpecified (2),
                              fastSelect (3),
                              restrictedFastResponse (4),
                              noFastSelect (5),
                              noRestrictedFastResponse (6)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "Expresses preference for use of fast select
                      facility.  The value of default for a
                      circuit is the PLE default.  A value of

                      default for the PLE means noFastSelect.  A
                      value of noFastSelect or
                      noRestrictedFastResponse indicates a circuit
                      may not use fast select or restricted fast
                      response."
              REFERENCE "10733 fastSelect;
              Sec ISO 8208 Section 15.2.2.6"
              DEFVAL { noFastSelect }
              ::= { x25CallParmEntry 10 }

      x25CallParmInThruPutClasSize    OBJECT-TYPE
              SYNTAX  INTEGER {
                              tcReserved1 (1),
                              tcReserved2 (2),
                              tc75 (3),
                              tc150 (4),
                              tc300 (5),
                              tc600 (6),
                              tc1200  (7),
                              tc2400  (8),
                              tc4800  (9),
                              tc9600  (10),
                              tc19200 (11),
                              tc48000 (12),
                              tc64000 (13),
                              tcReserved14 (14),
                              tcReserved15 (15),
                              tcReserved0 (16),
                              tcNone  (17),
                              tcDefault (18)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The incoming throughput class to negotiate.
                      A value of tcDefault for a circuit means use
                      the PLE default.  A value of tcDefault for
                      the PLE default means tcNone.  A value of
                      tcNone means do not negotiate throughtput
                      class."
              REFERENCE "See ISO 8208 Section 15.2.2.2, table 18"
              DEFVAL { tcNone }
              ::= { x25CallParmEntry 11 }

      x25CallParmOutThruPutClasSize   OBJECT-TYPE
              SYNTAX  INTEGER {
                              tcReserved1 (1),
                              tcReserved2 (2),

                              tc75 (3),
                              tc150 (4),
                              tc300 (5),
                      tc600 (6),
                              tc1200  (7),
                              tc2400  (8),
                              tc4800  (9),
                              tc9600  (10),
                              tc19200 (11),
                              tc48000 (12),
                              tc64000 (13),
                              tcReserved14 (14),
                              tcReserved15 (15),
                              tcReserved0 (16),
                              tcNone  (17),
                              tcDefault (18)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The outgoing throughput class to negotiate.
                      A value of tcDefault for a circuit means use
                      the PLE default.  A value of tcDefault for
                      the PLE default means use tcNone.  A value
                      of tcNone means do not negotiate throughtput
                      class."
              REFERENCE "See ISO 8208 Section 15.2.2.2, table 18"
              DEFVAL { tcNone }
              ::= { x25CallParmEntry 12 }

      x25CallParmCug  OBJECT-TYPE
              SYNTAX  DisplayString (SIZE(0..4))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The Closed User Group to specify.  This
                      consists of two or four octets containing
                      the characters 0 through 9.  A zero length
                      string indicates no facility requested.  A
                      string length of three containing the
                      characters DEF for a circuit means use the
                      PLE default, (the PLE default parameter may
                      not reference an entry of DEF.)"
              REFERENCE "See ISO 8208 Section 15.2.2.3"
              DEFVAL { h }
              ::= { x25CallParmEntry 13 }

      x25CallParmCugoa        OBJECT-TYPE

              SYNTAX  DisplayString (SIZE(0..4))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The Closed User Group with Outgoing Access
                      to specify.  This consists of two or four
                      octets containing the characters 0 through
                      9.  A string length of three containing the
                      characters DEF for a circuit means use the
                      PLE default (the PLE default parameters may
                      not reference an entry of DEF).  A zero
                      length string indicates no facility
                      requested."
              REFERENCE "See ISO 8208 Section 15.2.2.4"
              DEFVAL { h }
              ::= { x25CallParmEntry 14 }

      x25CallParmBcug OBJECT-TYPE
              SYNTAX  DisplayString (SIZE(0..3))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The Bilateral Closed User Group to specify.
                      This consists of two octets containing the
                      characters 0 through 9.  A string length of
                      three containing the characters DEF for a
                      circuit means use the PLE default (the PLE
                      default parameter may not reference an entry
                      of DEF).  A zero length string indicates no
                      facility requested."
              REFERENCE "See ISO 8208 Section 15.2.2.5"
              DEFVAL { h }
              ::= { x25CallParmEntry 15 }

      x25CallParmNui  OBJECT-TYPE
              SYNTAX  OCTET STRING (SIZE(0..108))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The Network User Identifier facility.  This
                      is binary value to be included immediately
                      after the length field.  The PLE will supply
                      the length octet.  A zero length string
                      indicates no facility requested.  This value
                      is ignored for the PLE default parameters
                      entry."
              REFERENCE "See ISO 8208 Section 15.2.2.7"
              DEFVAL { h }

              ::= { x25CallParmEntry 16 }

      x25CallParmChargingInfo OBJECT-TYPE
              SYNTAX INTEGER {
                              default (1),
                              noFacility (2),
                              noChargingInfo (3),
                              chargingInfo (4)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The charging Information facility.  A value
                      of default for a circuit means use the PLE
                      default.  The value of default for the
                      default PLE parameters means use noFacility.
                      The value of noFacility means do not include
                      a facility."
              REFERENCE "See ISO 8208 Section 15.2.2.8"
              DEFVAL { noFacility }
              ::= { x25CallParmEntry 17 }

      x25CallParmRpoa OBJECT-TYPE
              SYNTAX  DisplayString (SIZE(0..108))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The RPOA facility.  The octet string
                      contains n * 4 sequences of the characters
                      0-9 to specify a facility with n entries.
                      The octet string containing the 3 characters
                      DEF for a circuit specifies use of the PLE
                      default (the entry for the PLE default may
                      not contain DEF).  A zero length string
                      indicates no facility requested."
              REFERENCE "See ISO 8208, section 15.2.2.9"
              DEFVAL { h }
              ::= { x25CallParmEntry 18 }

      x25CallParmTrnstDly     OBJECT-TYPE
              SYNTAX  INTEGER (0..65537)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The Transit Delay Selection and Indication
                      value.  A value of 65536 indicates no
                      facility requested.  A value of 65537 for a
                      circuit means use the PLE default (the PLE

                      default parameters entry may not use the
                      value 65537).  The value 65535 may only be
                      used to indicate the value in use by a
                      circuit."
              REFERENCE "See ISO 8208, Section 15.2.2.13"
              DEFVAL { 65536 }
              ::= { x25CallParmEntry 19 }

              -- The following parameters are for CCITT facilities.

      x25CallParmCallingExt OBJECT-TYPE
              SYNTAX  DisplayString (SIZE(0..40))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The Calling Extension facility.  This
                      contains one of the following:

                      A sequence of hex digits with the value to
                      be put in the facility. These digits will be
                      converted to binary by the agent and put in
                      the facility.  These octets do not include
                      the length octet.

                      A value containing the three character DEF
                      for a circuit means use the PLE default,
                      (the entry for the PLE default parameters
                      may not use the value DEF).

                      A zero length string indicates no facility
                      requested."
              REFERENCE "See ISO 8208 Section 15.3.2.1"
              DEFVAL { h }
              ::= { x25CallParmEntry 20 }

      x25CallParmCalledExt OBJECT-TYPE
              SYNTAX  DisplayString (SIZE(0..40))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The Called Extension facility.  This
                      contains one of the following:

                      A sequence of hex digits with the value to
                      be put in the facility.  These digits will be
                      converted to binary by the agent and put in
                      the facility.  These octets do not include

                      the length octet.

                      A value containing the three character DEF
                      for a circuit means use the PLE default,
                      (the entry for the PLE default parameters
                      may not use the value DEF).

                      A zero length string indicates no facility
                      requested."
              REFERENCE "See ISO 8208 Section 15.3.2.2"
              DEFVAL { h }
              ::= { x25CallParmEntry 21 }

      x25CallParmInMinThuPutCls       OBJECT-TYPE
              SYNTAX  INTEGER (0..17)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The minimum input throughput Class.  A
                      value of 16 for a circuit means use the PLE
                      default (the PLE parameters entry may not
                      use this value).  A value of 17 indicates no
                      facility requested."
              REFERENCE "See ISO 8208 Section 15.3.2.3"
              DEFVAL { 17 }
              ::= { x25CallParmEntry 22 }

      x25CallParmOutMinThuPutCls OBJECT-TYPE
              SYNTAX  INTEGER (0..17)
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The minimum output throughput Class.  A
                      value of 16 for a circuit means use the PLE
                      default (the PLE parameters entry may not
                      use this value).  A value of 17 indicates no
                      facility requested."
              REFERENCE "See ISO 8208 Section 15.3.2.3"
              DEFVAL { 17 }
              ::= { x25CallParmEntry 23 }

      x25CallParmEndTrnsDly OBJECT-TYPE
              SYNTAX  OCTET STRING (SIZE(0..6))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The End-to-End Transit Delay to negotiate.
                      An octet string of length 2, 4, or 6

                      contains the facility encoded as specified
                      in ISO/IEC 8208 section 15.3.2.4.  An octet
                      string of length 3 containing the three
                      character DEF for a circuit means use the
                      PLE default (the entry for the PLE default
                      can not contain the characters DEF).  A zero
                      length string indicates no facility
                      requested."
              REFERENCE "See ISO 8208 Section 15.3.2.4"
              DEFVAL { h }
              ::= { x25CallParmEntry 24 }

      x25CallParmPriority OBJECT-TYPE
              SYNTAX  OCTET STRING (SIZE(0..6))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The priority facility to negotiate.  The
                      octet string encoded as specified in ISO/IEC
                      8208 section 15.3.2.5.  A zero length string
                      indicates no facility requested.  The entry
                      for the PLE default parameters must be zero
                      length."
              REFERENCE "See ISO 8208 Section 15.3.2.5"
              DEFVAL { h }
              ::= { x25CallParmEntry 25 }

      x25CallParmProtection OBJECT-TYPE
              SYNTAX  DisplayString (SIZE(0..108))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "A string contains the following:
                      A hex string containing the value for the
                      protection facility.  This will be converted
                      from hex to the octets actually in the
                      packet by the agent.  The agent will supply
                      the length field and the length octet is not
                      contained in this string.

                      An string containing the 3 characters DEF
                      for a circuit means use the PLE default (the
                      entry for the PLE default parameters may not
                      use the value DEF).

                      A zero length string mean no facility
                      requested."
              REFERENCE "See ISO 8208 Section 15.3.2.5"

              DEFVAL { h }
              ::= { x25CallParmEntry 26 }

      x25CallParmExptData OBJECT-TYPE
              SYNTAX  INTEGER {
                              default (1),
                              noExpeditedData (2),
                              expeditedData (3)
                      }
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The Expedited Data facility to negotiate.
                      A value of default for a circuit means use
                      the PLE default value.  The entry for the
                      PLE default parameters may not have the
                      value default."
              REFERENCE "See ISO 8208 Section 15.3.2.7"
              DEFVAL { noExpeditedData }
              ::= { x25CallParmEntry 27 }

      x25CallParmUserData     OBJECT-TYPE
              SYNTAX  OCTET STRING (SIZE (0..128))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The call user data as placed in the packet.
                      A zero length string indicates no call user
                      data.  If both the circuit call parameters
                      and the PLE default have call user data
                      defined, the data from the circuit call
                      parameters will be used.  If only the PLE
                      has data defined, the PLE entry will be
                      used.  If neither the circuit call
                      parameters or the PLE default entry has a
                      value, no call user data will be sent."
              REFERENCE "See ISO 8208 Section 12.2.1.1.6, 12.2.1.2"
              DEFVAL { h }
              ::= { x25CallParmEntry 28 }

      x25CallParmCallingNetworkFacilities     OBJECT-TYPE
              SYNTAX  OCTET STRING (SIZE (0..108))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The calling network facilities.  The
                      facilities are encoded here exactly as
                      encoded in the call packet.  These

                      facilities do not include the marker
                      facility code.

                      A zero length string in the entry for the
                      parameter to use when establishing a circuit
                      means use the PLE default.  A zero length
                      string in the entry for PLE default
                      parameters indicates no default facilities."
              REFERENCE "See ISO 8206 Section 15.1, category b"
              DEFVAL { h }
              ::= { x25CallParmEntry 29 }

      x25CallParmCalledNetworkFacilities      OBJECT-TYPE
              SYNTAX  OCTET STRING (SIZE (0..108))
              ACCESS  read-write
              STATUS  mandatory
              DESCRIPTION
                      "The called network facilities.  The
                      facilities are encoded here exactly as
                      encoded in the call packet.  These
                      facilities do not include the marker
                      facility code.

                      A zero length string in the entry for the
                      parameter to use when establishing a circuit
                      means use the PLE default.  A zero length
                      string in the entry for PLE default
                      parameters indicates no default facilities."
              REFERENCE "See ISO 8206 Section 15.1, category c"
              DEFVAL { h }
              ::= { x25CallParmEntry 30 }

      -- ###########################################################
      --              X.25 Traps
      -- ###########################################################

      x25Restart      TRAP-TYPE
              ENTERPRISE  x25
              VARIABLES { x25OperIndex }
              DESCRIPTION
                      "This trap means the X.25 PLE sent or
                      received a restart packet.  The restart that
                      brings up the link should not send a
                      x25Restart trap so the interface should send
                      a linkUp trap.  Sending this trap means the
                      agent does not send a linkDown and linkUp
                      trap."
              ::= 1

      x25Reset        TRAP-TYPE
              ENTERPRISE  x25
              VARIABLES { x25CircuitIndex,
                      x25CircuitChannel }
              DESCRIPTION
                      "If the PLE sends or receives a reset, the
                      agent should send an x25Reset trap."
              ::= 2

      -- ###########################################################
      --              X.25 Protocol Version Identifiers
      -- ###########################################################

      x25ProtocolVersion OBJECT IDENTIFIER
              ::= { x25 10 }

              -- X.25 CCITT 1976 version.
      x25protocolCcittV1976 OBJECT IDENTIFIER
              ::= { x25ProtocolVersion 1 }

              -- X.25 CCITT 1980 version.
      x25protocolCcittV1980 OBJECT IDENTIFIER
              ::= { x25ProtocolVersion 2 }

              -- X.25 CCITT 1984 version.
      x25protocolCcittV1984 OBJECT IDENTIFIER
              ::= { x25ProtocolVersion 3 }

              -- X.25 CCITT 1988 version.
      x25protocolCcittV1988 OBJECT IDENTIFIER
              ::= { x25ProtocolVersion 4 }

              -- X.25 1987 version of ISO 8208.
      x25protocolIso8208V1987 OBJECT IDENTIFIER
              ::= { x25ProtocolVersion 5 }

              -- X.25 1989 version of ISO 8208.
      x25protocolIso8208V1989 OBJECT IDENTIFIER
              ::= { x25ProtocolVersion 6 }

      -- ###########################################################

      END

Appendix: Revision History

      July 30 1992

      The July, 1992 release (Editor's Internal Reference Number
      2.14) made the following changes:

           The syntax of the index objects for tables that are
           congruent with the MIB-II ifTable were changed to
           ifIndexType.

           The x25CallParmRefCount object was added to the
           x25CallParmTable.

           The description of the x25CallParmTable and
           x25CallParmIndex objects were changed to only allow
           writing an entry with a zero reference count.

           A requirement for conformance was added after the
           definition of x25 in the ASN.1 definition.

      June 26 1992

      The June 29, 1992 release (Editor's Internal Reference Number
      2.12) made the following changes:

           The range of x25ChannelLIC was changed from (0..4096) to
           (0..4095).

           The range of x25ChannelHIC was changed from (0..4096) to
           (0..4095).

           The range of x25ChannelLTC was changed from (0..4096) to
           (0..4095).

           The range of x25ChannelHTC was changed from (0..4096) to
           (0..4095).

           The range of x25ChannelLOC was changed from (0..4096) to
           (0..4095).

           The range of x25ChannelHOC was changed from (0..4096) to
           (0..4095).

           The range of x25CircuitChannel was changed from (1..4096)
           to (0..4095).

           The range of x25ClearedCircuitChannel was changed from

           (1..4096) to (0..4095).

      June 1992

      The June 92 release (Editor's Internal Reference Number 2.11)
      made the following changes:

           A value of dxe was defined for x25AdmnInterfaceMode and
           x25OperInterfaceMode.

           The objects in the x25ChannelTable can now have a value
           of zero to indicate no channels configured in the range.

           The length of an X121Address was extended to 17 to
           accommodate the 1988 CCITT X.25 standard.

           Some object descriptions have been expanded and
           simplified, these include:  all the channel table objects
           except the index, x25AdmnDataRxmtCount,
           x25AdmnRejectCount, x25AdmnRegistrationRequestCount,
           x25OperDataRxmtCount, x25OperRejectCount,
           x25OperRegistrationRequestCount, x25CircuitEstablishTime,
           x25ClearedCircuitTimeEstablished,
           x25ClearedCircuitTimeCleared, x25CallParmIndex,
           x25CallParmInPacketSize, x25CircuitCalledAddress,
           x25CircuitOriginallCalledAddress,
           x25CircuitCallingAddress, x25CallParmFastSelect,
           x25CallParmCug, x25CallParmCugoa, x25CallParmBcug,
           x25CallParmNui, x25CallParmRpoa, x25CallParmCallingExt,
           x25CallParmCalledExt, x25CallParmProtection,
           x25StatInCallRefusals and x25CallParmOutPacketSize.

           The x25StatNumberPvcs object was deleted and
           x25AdmnNumberPVCs and x25OperNumberPVCs objects added.

           The object x25StatOutDataPackets was added.

           The object x25AdmnProtocolVersionSupported as added.

           The x25CircuitRemoteDteAddress was deleted.

           Some ASN.1 errors were corrected.

      April 1992

      The April release (Editor's Internal Reference Number 2.8)
      made many changes to incorporate the comments of the working
      group meeting in March 1992.

           All reference comments were changed to reference fields.

           The type PositiveInteger was imported from the RFC1381-
           MIB and used for all index and timer values.

           The x25PleTable was split into the x25AdmnTable,
           x25OperTable, and x25StatTable.

           The timer and counter objects from the x25CircuitTable
           were moved to the x25AdmnTable and replicated in the
           x25OperTable

           The objects in the x25CircuitTable were reordered to put
           the non-integer objects at the end of the table for
           easier implementation.

           The called and calling extension character set was
           extended to include a-f, and A-F.

           Additional states were added to the x25CircuitStatus
           object.

           Additional values were added to x25CircuitDirection
           x25CircuitCallParamId, and the addresses in the Circuit
           Table for PVCs.

           The length of the X25Address was changed to 0..15.

           The objects x25ClearedCircuitTimeEstablished,
           x25ClearedCircuitInPdus, and x25ClearedCircuitOutPdus
           were added to the x25ClearedCircuitTable.

           The name of the x25CircuitName was changed to
           x25CircuitDescr and the description was expanded.

           The access of the x25CircuitCallParamId was changed to
           read-only.

           The x25ClearedCircuitCodes object was split into the
           x25ClearedCircuitClearingCause and
           x25ClearedCircuitDiagnosticCode objects.

           The semantics of the x25ClearedCircuitIndex was
           redefined.

           Some of the description clauses were changed in an
           attempt to add clarity.

           DEFVAL clauses were added to most objects in the
           x25CallParmTable.

           Additional text was added to the description section to
           provide an overview of the tables of the MIB.

           The minimum allowable value for maximum active circuits
           was changed from one to zero.

      February 1992

      The February release (Editor's Internal Reference Number 1.14)
      made many changes.

           Many of the tables were combined.  For example, the
           x25InfoTable, x25PktStatTable, and x25TmrStatTable were
           combined into the x25PleTable.  The x25ConInfoTable,
           x25ConStatTable, and x25ConTimrTable were combined into
           the x25CircuitTable.

           The objects for call parameters were drastically
           reworked.  All call parameters were combined in the
           x25CallParmTable.  Any table, such as the  x25PleTable or
           x25CircuitTable, that needs to reference call parameters
           identifies an entry in the new table.  As part of this
           the x25ConDefTable was deleted and replaced with the
           x25PleDefCallParamId.

           The x25PvcTable was deleted; the x25CircuitStatus object
           provides similar information about PVCs.

           The x25ClearedCircuitTable was added to record the status
           code of cleared circuits.

           Many object definitions were restructured. For example,
           the time units for timers was changed from 1/100ths of a
           second to milliseconds.  Some indexes into tables were
           replaced with object identifiers.

           Much of the introductory text was changed and the
           references were changed to match.

      October 1991

      The October release (Editor Internal Reference Number 1.10)
      made the following changes:

           Changed x25ConInfoStatus to clarify the description and

           the pvcResetting(5) value was changed to pvcResetting(6)
           to avoid a conflict with a previous use of the number 5.

           The name of the counter object
           x25TmrStatRetryCountsExceeded was changed to
           x25TmrStatRetryCountExceededs.

           The name of the counter object
           x25TmrStatClearCountsExceeded was changed to
           x25TmrStatClearCountExceededs.

           All occurrence of Guage was changed to Gauge.

           Added the x25CallFcltyTable, x25CallFcltyCcittTable, and
           x25CallParamTable.

      June 1991

      The June release corrected some syntax errors and cleaned up
      some other minor things.

      April 1991

      The April 26 release of this document was the first release.
      That version was derived from the ISO work on network layer
      management as presented in ISO/IEC 10733 [11]

Acknowledgements

This document was produced by the x25mib working group:

           Fred Baker, ACC
           Art Berggreen, ACC
           Frank Bieser
           Gary Bjerke, Tandem
           Bill Bowman, HP
           Christopher Bucci, Datability
           Charles Carvalho, ACC
           Jeff Case, Snmp Research
           Angela Chen, HP
           Carson Cheung, BNR
           Tom Daniel, Spider Systems
           Chuck Davin, MIT
           Billy Durham, Honeywell
           Richard Fox, Synoptics
           Doug Geller, Data General
           Herve Goguely, LIR Corp
           Andy Goldthorpe, british-telecom

           Walter D. Guilarte
           David Gurevich
           Steve Huston, Process Software Corporation
           Jon Infante, ICL
           Frank Kastenholz, Clearpoint
           Zbigniew Kielczewski, Eicon
           Cheryl Krupezak, Georgia Tech
           Mats Lindstrom, Diab Data AB
           Andrew Malis, BBN
           Evan McGinnis, 3Com
           Gary (G.P.)Mussar, BNR
           Chandy Nilakantan, 3Com
           Randy Pafford, Data General
           Ragnar Paulson, The Software Group Limited
           Dave Perkins, Synoptics
           Walter Pinkarschewsky, DEC
           Karen Quidley, Data General
           Chris Ranch, Novell
           Paul S. Rarey, DHL Systems Inc.
           Jim Roche, Newbridge Research
           Philippe Roger, LIR Corp.
           Timon Sloane
           Mike Shand, DEC
           Brad Steina, Microcom
           Bob Stewart, Xyplex
           Tom Sullivan, Data General
           Rodney Thayer, Sable Technology Corporation
           Mark Therieau, Microcom
           Jane Thorn, Data General
           Dean Throop, Data General
           Maurice Turcotte, Racal Datacom
           Mike Zendels, Data General

In addition, the contributions of the following individuals are also acknowledged:

               John Harper, DEC
               Chairman of the ISO committee for
               Network Level Management Information

References

[1] Rose M., and K. McCloghrie, "Structure and Identification of

   Management Information for TCP/IP-based internets", STD 16, RFC
   1155, Performance Systems International, Hughes LAN Systems, May
   1990.

[2] McCloghrie K., and M. Rose, "Management Information Base for

   Network Management of TCP/IP-based internets", RFC 1156, Hughes
   LAN Systems, Performance Systems International, May 1990.

[3] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple

   Network Management Protocol", STD 15, RFC 1157, SNMP Research,
   Performance Systems International, Performance Systems
   International, MIT Laboratory for Computer Science, May 1990.

[4] Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions",

   STD 16, RFC 1212, Performance Systems International, Hughes LAN
   Systems, March 1991.

[5] Rose M., Editor, "Management Information Base for Network

   Management of TCP/IP-based internets: MIB-II", STD 17, RFC 1213,
   Performance Systems International, March 1991.

[6] Information processing systems - Open Systems Interconnection -

   Specification of Abstract Syntax Notation One (ASN.1),
   International Organization for Standardization, International
   Standard 8824, December 1987.

[7] Information processing systems - Open Systems Interconnection -

   Specification of Basic Encoding Rules for Abstract Notation One
   (ASN.1), International Organization for Standardization,
   International Standard 8825, December 1987.

[8] Stewart, B., Editor, "Definitions of Managed Objects for RS-232-

   like Hardware Devices", RFC 1317, Xyplex, Inc., April 1992.

[9] Throop, D., Editor, "SNMP MIB extension for LAPB", RFC 1381, Data

   General Corporation, November 1992.

 [10] "Information technology - - Data communication - X.25 Packet
   layer Protocol for Data Terminal Equipment", International
   Organization for Standardization, International Standard 8208,
   March 1990.

 [11] "Information Technology - Telecommunications and information
   exchange between systems - Elements of Management Information
   Related to OSI network Layer Standards", Committee Draft
   International Standard 10733, November 1990.

Security Considerations

Security issues are not discussed in this memo.

Authors' Addresses

Dean D. Throop Data General Corporation 62 Alexander Dr. Research Triangle Park, NC 27709

Phone: (919)248-8421 EMail: [email protected]