RFC1407

Network Working Group T. Cox Request for Comments: 1407 K. Tesink Obsoletes: 1233 Bell Communications Research

                                                             Editors
                                                        January 1993

                 Definitions of Managed Objects
                 for the DS3/E3 Interface Type

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 an extension to the Management Information Base (MIB) for use with network management protocols in TCP/IP-based internets. In particular, it defines objects for managing DS3 and E3 Interfaces. This document is a companion document with Definitions of Managed Objects for the DS1 Interface Type. This document entirely replaces RFC 1233, which contains a fundamental error: many objects are encoded as Counters that must be encoded as INTEGERs or Gauges. The magnitude of the change required is sufficient that virtually every object changed. Therefore, the MIB documented in RFC 1233 should not be implemented. Table of Contents 1. The Network Management Framework ...................... 2 2. Objects ............................................... 2 2.1 Format of Definitions ................................ 3 2.2 Changes from RFC 1233 ................................ 3 3. Overview .............................................. 5 3.1 Binding between ifIndex and DS3/E3 Interfaces ........ 5 3.2 Objectives of this MIB Module ........................ 7 3.3 DS3/E3 Terminology ................................... 7 3.3.1 Error Events ....................................... 7 3.3.2 Performance Parameters ............................. 8 3.3.3 Performance Defects ................................ 10 3.3.4 Other Terms ........................................ 11 4. Object Definitions .................................... 12 4.1 The DS3/E3 Near End Group ............................ 12

4.1.1 The DS3/E3 Configuration ........................... 12 4.1.2 The DS3/E3 Current ................................. 18 4.1.3 The DS3/E3 Interval ................................ 21 4.1.4 The DS3/E3 Total ................................... 25 4.2 The DS3 Far End Group ................................ 29 4.2.1 The DS3 Far End Configuration ...................... 29 4.2.2 The DS3 Far End Current ............................ 31 4.2.3 The DS3 Far End Interval ........................... 34 4.2.4 The DS3 Far End Total .............................. 36 4.3 The DS3/E3 Fractional Group .......................... 38 5. Acknowledgments ....................................... 41 6. References ............................................ 41 7. Security Considerations ............................... 43 8. Authors' Addresses .................................... 43

The Network Management Framework

The Internet-standard Network Management Framework consists of three components. They are:

  STD 16/RFC 1155 which defines the SMI, the mechanisms used for
  describing and naming objects for the purpose of management.  STD
  16/RFC 1212 defines a more concise description mechanism, which is
  wholly consistent with the SMI.
  RFC 1156 which defines MIB-I, the core set of managed objects for
  the Internet suite of protocols.  STD 17/RFC 1213, defines MIB-II,
  an evolution of MIB-I based on implementation experience and new
  operational requirements.
  STD 15/RFC 1157 which defines the SNMP, the protocol used for
  network access to managed objects.

The Framework permits new objects to be defined for the purpose of experimentation and evaluation.

Objects

Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the subset of Abstract Syntax Notation One (ASN.1) [7] defined in the SMI. In particular, each object has a name, a syntax, and an encoding. The name is an object identifier, an administratively assigned name, which specifies an object type. The object type together with an object instance serves to uniquely identify a specific instantiation of the object. For human convenience, we often use a textual string, termed the OBJECT DESCRIPTOR, to also refer to the object type.

The syntax of an object type defines the abstract data structure corresponding to that object type. The ASN.1 language is used for this purpose. However, the SMI [3] purposely restricts the ASN.1 constructs which may be used. These restrictions are explicitly made for simplicity. The encoding of an object type is simply how that object type is represented using the object type's syntax. Implicitly tied to the notion of an object type's syntax and encoding is how the object type is represented when being transmitted on the network. The SMI specifies the use of the basic encoding rules of ASN.1 [8], subject to the additional requirements imposed by the SNMP.

Format of Definitions

Section 4 contains contains the specification of all object types contained in this MIB module. The object types are defined using the conventions defined in the SMI, as amended by the extensions specified in STD 16, RFC 1212 [13].

Changes from RFC 1233

This MIB obsoletes RFC 1233. The changes from RFC 1233 are the following:

  --  This MIB module contains information to manage
      an E3 interface, also.
  --  This MIB module contains three groups:
       DS3/E3 Near End Group which is mandatory,
       DS3 Far End Group which is optional, and
       DS3 Fractional Group which is optional.
  --  The DS3 Far End Group is a new group and contains
      configuration information and statistics
      that are collected from the far end DS3/E3 interface.
      Presently, the Far End Group may only be implemented by
      DS3 systems that use C-bit Parity or SYNTRAN.
  --  The DS3 Fractional Group is a new group and is
      modeled after the DS1 Fractional Group.
  --  ds3CSUIndex has been redefined and renamed
      to dsx3LineIndex.  This object
      is the identifier of a DS3/E3 Interface on a device.
      On a CSU, a single DS3/E3 data stream will cross two DS3/E3
      interfaces, which have separate dsx3LineIndex values.

  --  ds3Index has been redefined and renamed to
      dsx3IfIndex.  This value for this
      object is equal to the value of ifIndex from the Interfaces
      table of MIB II (STD 17, RFC 1213).
  --  The ACCESS for objects in the dsx3ConfigTable has
      been set to read-write for items that are configurable.
  --  The dsx3ZeroCoding has been renamed to dsx3LineCoding.
  --  A new object has been added called dsx3LoopbackConfig,
      which better describes the loopback capabilities of
      a DS3/E3 interface on a device.
  --  The dsx3SendCode object has been updated to reflect
      different types of loopback messages.
  --  A new object has been added called dsx3LineStatus.
      This object better describes the status (e.g.,
      failure state and loopback state) of a
      DS3/E3 interface.
  --  A new object has been added called dsx3TransmitClockSource.
      This object identifies the source for the transmit clock.
  --  All Counters have been changed to Gauges.
  --  A Line Errored Seconds object has been added to
      all near end tables.
  --  Line Coding Violations are counted instead of Bipolar
      Violations.
  --  A new Coding Violation counter has been added to count
      coding violations reported via the C-bits of SYNTRAN
      and C-bit Parity DS3 applications.
      The original Coding Violation counter has been renamed
      to PCV to mean coding violations reported via the P-bits.
      This count is also added for symmetry with the far end
      statistics.
  --  A new Errored Second counter and Severely Errored Second
      counter has been added to count these performance events
      via the C-bits of the SYNTRAN and C-bit Parity DS3
      applications.  The original ES and SES counters have been
      renamed to PES and PSES to mean reported via the P-bits.
      These counts are also added for symmetry with the far end
      statistics.

Overview

These objects are used when the particular media being used to realize an interface is a DS3/E3 interface. At present, this applies to these values of the ifType variable in the Internet-standard MIB:

           ds3 (30)

The DS3 definitions contained herein are based on the DS3 specifications in ANSI T1.102-1987, ANSI T1.107-1988, ANSI T1.107a- 1990, and ANSI T1.404-1989 [9,10,10a,11]. The E3 definitions contained herein are based on the E3 specifications in CCITT G.751 [14].

Binding between ifIndex and DS3/E3 Interfaces

Different physical configurations for the support of SNMP with DS3/E3 equipment exist. To accommodate these scenarios, two different indices for DS3/E3 interfaces are introduced in this MIB. These indices are dsx3IfIndex and dsx3LineIndex. External interface scenario: the SNMP Agent represents all managed DS3/E3 lines as external interfaces (for example, an Agent residing on the device supporting DS3/E3 interfaces directly): For this scenario, all interfaces are assigned an integer value equal to ifIndex, and the following applies:

         ifIndex=dsx3IfIndex=dsx3LineIndex for all interfaces.

The dsx3IfIndex column of the DS3/E3 Configuration table relates each DS3/E3 interface to its corresponding interface (ifIndex) in the Internet-standard MIB (MIB-II STD 17, RFC 1213). External&Internal interface scenario: the SNMP Agents resides on an host external from the device supporting DS3/E3 interfaces (e.g., a router). The Agent represents both the host and the DS3/E3 device. The index dsx3LineIndex is used to not only represent the DS3/E3 interfaces external from the host/DS3/E3-device combination, but also the DS3/E3 interfaces connecting the host and the DS3/E3 device. The index dsx3IfIndex is always equal to ifIndex. Example: A shelf full of CSUs connected to a Router. An SNMP Agent residing on the router proxies for itself and the CSU. The router has also an Ethernet interface:

      +-----+
|     |     |
|     |     |               +---------------------+
|E    |     |  44.736 MBPS  |   ds3 M13    Line#A | ds3 C-bit Parity
|t    |  R  |---------------+ - - - - -  - - -  - +------>
|h    |     |               |                     |
|e    |  O  |  44.736 MBPS  |   ds3 M13    Line#B | ds3 C-bit Parity
|r    |     |---------------+ - - - - - - - - - - +------>
|n    |  U  |               |                     |
|e    |     |  44.736 MBPS  |   ds3 M13    Line#C | ds3 C-bit Parity
|t    |  T  |---------------+ - - - -- -- - - - - +------>
|     |     |               |                     |
|-----|  E  |  44.736 MBPS  |   ds3 M13    Line#D | ds3 C-bit Parity
|     |     |---------------+ -  - - - -- - - - - +------>
|     |  R  |               |_____________________|
|     |     |
|     +-----+

The assignment of the index values could for example be:

        ifIndex (= dsx3IfIndex)                     dsx3LineIndex
                1                   NA                  NA (Ethernet)
                2      Line#A   Router Side             6
                2      Line#A   Network Side            7
                3      Line#B   Router Side             8
                3      Line#B   Network Side            9
                4      Line#C   Router Side            10
                4      Line#C   Network Side           11
                5      Line#D   Router Side            12
                5      Line#D   Network Side           13

For this example, ifNumber is equal to 5. Note the following description of dsx3LineIndex: the dsx3LineIndex identifies a DS3/E3 Interface on a managed device. If there is an ifEntry that is directly associated with this and only this DS3/E3 interface, it should have the same value as ifIndex. Otherwise, number the dsx3LineIndices with an unique identifier following the rules of choosing a number greater than ifNumber and numbering inside interfaces (e.g., equipment side) with even numbers and outside interfaces (e.g., network side) with odd numbers. If the CSU shelf is managed by itself by a local SNMP Agent, the situation would be:

        ifIndex (= dsx3IfIndex)                      dsx3LineIndex
                1      Line#A     Network Side            1
                2      Line#A     RouterSide              2
                3      Line#B     Network Side            3
                4      Line#B     RouterSide              4
                5      Line#C     Network Side            5
                6      Line#C     Router Side             6
                7      Line#D     Network Side            7
                8      Line#D     Router Side             8

Objectives of this MIB Module

There are numerous things that could be included in a MIB for DS3/E3 signals: the management of multiplexors, CSUs, DSUs, and the like. The intent of this document is to facilitate the common management of all devices with DS3/E3 interfaces. As such, a design decision was made up front to very closely align the MIB with the set of objects that can generally be read from DS3/E3 devices that are currently deployed.

DS3/E3 Terminology

The terminology used in this document to describe error conditions on a DS3 interface as monitored by a DS3 device are based on the definitions from the ANSI T1M1.3/92-005R1 draft standard [12]. If the definition in this document does not match the definition in the ANSI T1M1.3/92-005R1 draft document, the implementer should follow the definition described in this document.

Error Events

      Bipolar Violation (BPV) Error Event
        A bipolar violation error event, for B3ZS(HDB3)-coded
        signals, is the occurrence of a pulse of the same polarity
        as the previous pulse without being part of the zero
        substitution code, B3ZS(HDB3).  For B3ZS(HDB3)-coded
        signals, a bipolar violation error event may also include
        other error patterns such as:  three(four) or more
        consecutive zeros and incorrect polarity.
      Excessive Zeros (EXZ) Error Event
        An EXZ is the occurrence of any zero string length equal
        to or greater than 3 for B3ZS, or greater than 4 for HDB3.
      Line Coding Violation (LCV) Error Event
        This parameter is a count of both BPVs and EXZs
        occurring over the accumulation period.  An EXZ

        increments the LCV by one regardless of the length
        of the zero string.
      P-bit Coding Violation (PCV) Error Event
        For all DS3 applications, a coding violation error
        event is a P-bit
        Parity Error event.  A P-bit Parity Error event is the
        occurrence of a received P-bit code on the DS3 M-frame
        that is not identical to the corresponding locally-
        calculated code.
      C-bit Coding Violation (CCV) Error Event
        For C-bit Parity and SYNTRAN DS3 applications, this is
        the count of coding violations reported via the C-bits.
        For C-bit Parity, it is a count of CP-bit parity errors
        occurring in the accumulation interval.  For SYNTRAN, it
        is a count of CRC-9 errors occurring in the accumulation
        interval.

Performance Parameters

All performance parameters are accumulated in fifteen minute intervals and up to 96 intervals (24 hours worth) are kept by an agent. Fewer than 96 intervals of data will be available if the agent has been restarted within the last 24 hours. In addition, there is a rolling 24-hour total of each performance parameter. There is no requirement for an agent to ensure fixed relationship between the start of a fifteen minute interval and any wall clock; however some agents may align the fifteen minute intervals with quarter hours.

      Line Errored Seconds (LES)
        A Line Errored Second is a second in
        which one or more CVs occurred OR one or more LOS defects.
      P-bit Errored Seconds (PES)
        An PES is a second with one or more PCVs OR
        one or more Out of Frame defects OR a detected incoming AIS.
        This gauge is not incremented when UASs are counted.
      P-bit Severely Errored Seconds (PSES)
        A PSES is a second with 44 or more PCVs OR
        one or more Out of Frame defects OR a detected incoming AIS.
        This gauge is not incremented when UASs are counted.
      C-bit Errored Seconds (CES)
        An CES is a second with one or more CCVs OR

        one or more Out of Frame defects OR a detected incoming AIS.
        This count is only for the SYNTRAN and C-bit Parity DS3
        applications.  This gauge is not incremented when UASs are
        counted.
      C-bit Severely Errored Seconds (CSES)
        A CSES is a second with 44 or more CCVs OR
        one or more Out of Frame defects OR a detected incoming AIS.
        This count is only for the SYNTRAN and C-bit Parity DS3
        applications.  This gauge is not incremented when UASs
        are counted.
      Severely Errored Framing Seconds (SEFS)
        A SEFS is a second with one or more Out of Frame defects
        OR a detected incoming AIS.
      Unavailable Seconds (UAS)
        UAS are calculated by counting the number of seconds that
        the interface is unavailable.  The DS3 interface is said
        to be unavailable from the onset of 10 contiguous PSESs, or
        the onset of the condition leading to a failure (see Failure
        States).  If the condition leading to the failure was
        immediately preceded by one or more contiguous PSESs, then
        the DS3 interface unavailability starts from the onset of
        these PSESs.  Once unavailable, and if no failure is
        present, the DS3 interface becomes available at the onset
        of 10 contiguous seconds with no PSESs.  Once unavailable,
        and if a failure is present, the DS3 interface becomes
        available at the onset of 10 contiguous seconds with no
        PSESs, if the failure clearing time is less than
        or equal to 10 seconds.  If the failure clearing time is
        more than 10 seconds, the DS3 interface becomes available
        at the onset of 10 contiguous seconds with no PSESs, or
        the onset period leading to the successful clearing
        condition, whichever occurs later.  With respect to the
        DS3 error counts, all counters are incremented
        while the DS3 interface is deemed available.  While the
        interface is deemed unavailable, the only count that is
        incremented is UASs.
        A special case exists when the 10 or more second period
        crosses the 900 second statistics window boundary, as the
        foregoing description implies that the PSES and UAS
        counters must be adjusted when the Unavailable Signal
        State is entered. Clearly, successive GETs of the
        affected dsx3IntervalPSESs and dsx3IntervalUASs objects
        will return differing values if the first GET occurs
        during the first few seconds of the window.  This is

        viewed as an unavoidable side-effect of selecting the
        presently defined managed objects as a basis for this
        memo.

Performance Defects

      Failure States:
        The Remote Alarm Indication (RAI) failure, in SYNTRAN
        applications, is declared after detecting
        the Yellow Alarm Signal on the alarm channel.  See ANSI
        T1.107a-1990 [10].  The Remote Alarm Indication failure,
        in C-bit Parity DS3 applications, is declared
        as soon as the preqsence of either one or two alarm signals
        are detected on then Far End Alarm Channel.  See [10].
        The Remote Alarm Indication failure may also be declared
        after detecting the far-end SEF/AIS defect (aka yellow).
        The Remote Alarm Indication failure is cleared as soon as
        the presence of the any of the above alarms are removed.
        Also, the incoming failure state is declared when a defect
        persists for at least 2-10 seconds.  The defects are
        the following:  Loss of Signal (LOS), an Out of Frame (OOF)
        or an incoming Alarm Indication Signal (AIS).
        The Failure State is cleared when the defect is absent
        for less than or equal to 20 seconds.
      Far End SEF/AIS defect (aka yellow)
        A Far End SEF/AIS defect is the occurrence of the two X-bits
        in a M-frame set to zero.  The Far End SEF/AIS defect is
        terminated when the two X-bits in a M-frame are set to
        one.
      Out of Frame (OOF) defect
        A DS3 OOF defect is detected when any three or more errors
        in sixteen or fewer consecutive F-bits occur within a DS3
        M-frame.  An OOF defect may also be called a Severely
        Errored Frame (SEF) defect.  An OOF defect is cleared when
        reframe occurs.  A DS3 Loss of Frame (LOF) failure is
        declared when the DS3 OOF defect is consistent for 2 to 10
        seconds.  The DS3 OOF defect ends when reframe occurs.
        The DS3 LOF failure is cleared when the DS3 OOF
        defect is absent for 10 to 20 seconds.
        An E3 OOF defect is detected when four consecutive frame
        alignment signals have been incorrectly received in there
        predicted positions in an E3 signal. E3 frame alignment
        occurs when the presence of three consecutive frame
        alignment signals have been detected.

      Loss of Signal (LOS) defect
        The DS3 LOS defect is declared upon observing 175 +/- 75
        contiguous pulse positions with no pulses of either
        positive or negative polarity.
        The DS3 LOS defect is terminated upon observing an average
        pulse density of at least 33% over a period of 175 +/- 75
        contiguous pulse positions starting with the receipt of a
        pulse.
      Alarm Indication Signal (AIS) defect
        The DS3 AIS is framed with "stuck stuffing."  This implies
        that it has a valid M-subframe alignments bits, M-frame
        alignment bits, and P bits.  The information bits are set
        to a 1010... sequence, starting with a one (1) after each
        M-subframe alignment bit, M-frame alignment bit, X bit, P
        bit, and C bit.  The C bits are all set to zero giving
        what is called "stuck stuffing."  The X bits are set to
        one.  The DS3 AIS defect is declared after DS3 AIS is
        present in contiguous M-frames for a time equal to or
        greater than T, where 0.2 ms <= T <= 100 ms.
        The DS3 AIS defect is terminated after AIS is absent in
        contiguous M-frames for a time equal to or greater than T.
        The E3 binary content of the AIS is nominally a continuous
        stream of ones.  AIS detection and the application of
        consequent actions, should be completed within a time
        limit of 1 ms.

Other Terms

      Circuit Identifier
        This is a character string specified by the circuit
        vendor, and is useful when communicating with the vendor
        during the troubleshooting process.

Object Definitions

           RFC1407-MIB DEFINITIONS ::= BEGIN
           IMPORTS
                   Gauge
                           FROM RFC1155-SMI
                   DisplayString, transmission
                           FROM RFC1213-MIB
                   OBJECT-TYPE
                           FROM RFC-1212;
           -- This MIB module uses the extended OBJECT-TYPE macro
           -- as defined in RFC 1212.
                   ds3  OBJECT IDENTIFIER ::= { transmission 30 }

           -- The DS3/E3 Near End Group
           -- Implementation of this group is mandatory for all
           -- systems that attach to a DS3/E3 Interface.
           -- The DS3/E3 Near End Group consists of four tables:
           --    DS3/E3 Configuration
           --    DS3/E3 Current
           --    DS3/E3 Interval
           --    DS3/E3 Total
           -- the DS3/E3 Configuration
           dsx3ConfigTable OBJECT-TYPE
               SYNTAX  SEQUENCE OF Dsx3ConfigEntry
               ACCESS  not-accessible
               STATUS  mandatory
               DESCRIPTION
                       "The DS3/E3 Configuration table."
              ::= { ds3 5 }
          dsx3ConfigEntry OBJECT-TYPE
              SYNTAX  Dsx3ConfigEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "An entry in the DS3/E3 Configuration table."
             INDEX   { dsx3LineIndex }
             ::= { dsx3ConfigTable 1 }

         Dsx3ConfigEntry ::=
             SEQUENCE {
                 dsx3LineIndex
                     INTEGER,
                 dsx3IfIndex
                     INTEGER,
                 dsx3TimeElapsed
                     INTEGER,
                 dsx3ValidIntervals
                     INTEGER,
                 dsx3LineType
                     INTEGER,
                 dsx3LineCoding
                     INTEGER,
                 dsx3SendCode
                     INTEGER,
                 dsx3CircuitIdentifier
                     DisplayString,
                 dsx3LoopbackConfig
                     INTEGER,
                 dsx3LineStatus
                     INTEGER,
                 dsx3TransmitClockSource
                     INTEGER
         }
         dsx3LineIndex OBJECT-TYPE
             SYNTAX  INTEGER (1..65535)
             ACCESS  read-only
             STATUS  mandatory
             DESCRIPTION
                     "This object is the identifier of a DS3/E3
                     Interface on a managed device.  If there is an
                     ifEntry that is directly associated with this
                     and only this DS3/E3 interface, it should have
                     the same value as ifIndex.  Otherwise, number
                     the dsx3LineIndices with an unique identifier
                     following the rules of choosing a number that
                     is greater than ifNumber and numbering the
                     inside interfaces (e.g., equipment side) with
                     even numbers and outside interfaces (e.g,
                     network side) with odd numbers."
            ::= { dsx3ConfigEntry 1 }
        dsx3IfIndex OBJECT-TYPE
            SYNTAX  INTEGER (1..65535)
            ACCESS  read-only
            STATUS  mandatory

            DESCRIPTION
                    "This value for this object is equal to the
                    value of ifIndex from the Interfaces table of
                    MIB II (RFC 1213)."
           ::= { dsx3ConfigEntry 2 }
       dsx3TimeElapsed OBJECT-TYPE
           SYNTAX  INTEGER (0..899)
           ACCESS  read-only
           STATUS  mandatory
           DESCRIPTION
                   "The number of seconds that have elapsed since
                   the beginning of the near end current error-
                   measurement period."
          ::= { dsx3ConfigEntry 3 }
      dsx3ValidIntervals OBJECT-TYPE
          SYNTAX  INTEGER (0..96)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of previous near end intervals for
                  which valid data was collected.  The value will be
                  96 unless the interface was brought online within
                  the last 24 hours, in which case the value will be
                  the number of complete 15 minute near end
                  intervals since the interface has been online."
          ::= { dsx3ConfigEntry 4 }
      dsx3LineType OBJECT-TYPE
          SYNTAX  INTEGER {
                      dsx3other(1),
                      dsx3M23(2),
                      dsx3SYNTRAN(3),
                      dsx3CbitParity(4),
                      dsx3ClearChannel(5),
                      e3other(6),
                      e3Framed(7),
                      e3Plcp(8)
                  }
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
                  "This variable indicates the variety of DS3 C-bit
                  or E3 application
                  implementing this interface.  The type of
                  interface affects the interpretation of the
                  usage and error statistics.

                  The rate of DS3 is 44.736 Mbps and E3 is
                  34.368 Mbps.
                  The dsx3ClearChannel value means that the C-bits
                  are not used except for sending/receiving
                  AIS.
                  The values, in sequence, describe:
                  TITLE:            SPECIFICATION:
                  dsx3M23            ANSI T1.107-1988
                  dsx3SYNTRAN        ANSI T1.107-1988
                  dsx3CbitParity     ANSI T1.107a-1989
                  dsx3ClearChannel   ANSI T1.102-1987
                  e3Framed           CCITT G.751
                  e3Plcp             ETSI T/NA(91)18."
          ::= { dsx3ConfigEntry 5 }
      dsx3LineCoding OBJECT-TYPE
          SYNTAX  INTEGER {
                      dsx3Other(1),
                      dsx3B3ZS(2),
                      e3HDB3(3)
                  }
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
                  "This variable describes the variety of Zero Code
                  Suppression used on this interface, which in turn
                  affects a number of its characteristics.
                  dsx3B3ZS and e3HDB3 refer to the use of specified
                  patterns of normal bits and bipolar violations
                  which are used to replace sequences of zero bits
                  of a specified length."
          ::= { dsx3ConfigEntry 6 }
      dsx3SendCode OBJECT-TYPE
             SYNTAX  INTEGER {
                     dsx3SendNoCode(1),
                     dsx3SendLineCode(2),
                     dsx3SendPayloadCode(3),
                     dsx3SendResetCode(4),
                     dsx3SendDS1LoopCode(5),
                     dsx3SendTestPattern(6)
                     }
             ACCESS  read-write
             STATUS  mandatory
             DESCRIPTION

                  "This variable indicates what type of code is
                  being sent across the DS3/E3 interface by the
                  device.  (These are optional for E3 interfaces.)
                  The values mean:
                     dsx3SendNoCode
                         sending looped or normal data
                     dsx3SendLineCode
                         sending a request for a line loopback
                     dsx3SendPayloadCode
                         sending a request for a payload loopback
                         (i.e., all DS1/E1s in a DS3/E3 frame)
                     dsx3SendResetCode
                         sending a loopback deactivation request
                     dsx3SendDS1LoopCode
                         requesting to loopback a particular DS1/E1
                         within a DS3/E3 frame
                     dsx3SendTestPattern
                         sending a test pattern."
             ::= { dsx3ConfigEntry 7 }
      dsx3CircuitIdentifier OBJECT-TYPE
          SYNTAX  DisplayString (SIZE (0..255))
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
                  "This variable contains the transmission vendor's
                  circuit identifier, for the purpose of
                  facilitating troubleshooting."
          ::= { dsx3ConfigEntry 8 }
      dsx3LoopbackConfig OBJECT-TYPE
             SYNTAX  INTEGER {
                       dsx3NoLoop(1),
                       dsx3PayloadLoop(2),
                       dsx3LineLoop(3),
                       dsx3OtherLoop(4)
                     }
             ACCESS  read-write
             STATUS  mandatory
             DESCRIPTION
                "This variable represents the loopback configuration
                of the DS3/E3 interface.

                The values mean:
                dsx3NoLoop
                  Not in the loopback state.  A device that is
                  not capable of performing a loopback on
                  the interface shall always return this as
                  it's value.
                dsx3PayloadLoop
                  The received signal at this interface is looped
                  through the device.
                  Typically the received signal
                  is looped back for retransmission after it has
                  passed through the device's framing function.
                dsx3LineLoop
                  The received signal at this interface does not
                  go through the device (minimum penetration) but
                  is looped back out.
                dsx3OtherLoop
                  Loopbacks that are not defined here."
             ::= { dsx3ConfigEntry 9 }
      dsx3LineStatus OBJECT-TYPE
          SYNTAX  INTEGER (1..1023)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
             "This variable indicates the
             Line Status of the interface.
             It contains loopback state information
             and failure state information.
             The dsx3LineStatus is a bit map represented
             as a sum, therefore,
             it can represent multiple failures
             and a loopback (see dsx3LoopbackConfig object
             for the type of loopback)
             simultaneously.
             The dsx3NoAlarm should be set if and only if
             no other flag is set.
             The various bit positions are:
                1     dsx3NoAlarm       No alarm present
                2     dsx3RcvRAIFailure Receiving Yellow/Remote
                      Alarm Indication
                4     dsx3XmitRAIAlarm Transmitting Yellow/Remote
                      Alarm Indication

                8     dsx3RcvAIS        Receiving AIS failure state
               16     dsx3XmitAIS       Transmitting AIS
               32     dsx3LOF           Receiving LOF failure state
               64     dsx3LOS           Receiving LOS failure state
              128     dsx3LoopbackState Looping the received signal
              256     dsx3RcvTestCode   Receiving a Test Pattern
              512     dsx3OtherFailure any line status not defined
                      here"
          ::= { dsx3ConfigEntry 10 }
      dsx3TransmitClockSource OBJECT-TYPE
          SYNTAX  INTEGER {
                      loopTiming(1),
                      localTiming(2),
                      throughTiming(3)
                  }
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
             "The source of Transmit Clock.
             is derived from the recovered receive clock of
             another DS3 interface."
          ::= { dsx3ConfigEntry 11 }

      -- the DS3/E3 Current
      -- The DS3/E3 current table contains various statistics being
      -- collected for the current 15 minute interval.
      dsx3CurrentTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3CurrentEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "The DS3/E3 Current table."
          ::= { ds3 6 }
      dsx3CurrentEntry OBJECT-TYPE
          SYNTAX  Dsx3CurrentEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "An entry in the DS3/E3 Current table."
          INDEX   { dsx3CurrentIndex }
          ::= { dsx3CurrentTable 1 }

      Dsx3CurrentEntry ::=
          SEQUENCE {
              dsx3CurrentIndex
                  INTEGER,
              dsx3CurrentPESs
                  Gauge,
              dsx3CurrentPSESs
                  Gauge,
              dsx3CurrentSEFSs
                  Gauge,
              dsx3CurrentUASs
                  Gauge,
              dsx3CurrentLCVs
                  Gauge,
              dsx3CurrentPCVs
                  Gauge,
              dsx3CurrentLESs
                  Gauge,
              dsx3CurrentCCVs
                  Gauge,
              dsx3CurrentCESs
                  Gauge,
              dsx3CurrentCSESs
                  Gauge
          }
      dsx3CurrentIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..65535)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The index value which uniquely identifies the
                  DS3/E3 interface to which this entry is
                  applicable.  The interface identified by a
                  particular value of this index is the same
                  interface as identified by the same value an
                  dsx3LineIndex object instance."
          ::= { dsx3CurrentEntry 1 }
      dsx3CurrentPESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Errored Seconds, encountered by a DS3 interface in
                  the current 15 minute interval."
          ::= { dsx3CurrentEntry 2 }

      dsx3CurrentPSESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Severely Errored Seconds, encountered by a DS3
                  interface in the current 15 minute interval."
          ::= { dsx3CurrentEntry 3 }
      dsx3CurrentSEFSs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Severely Errored Framing Seconds, encountered by a
                  DS3/E3 interface in the current 15 minute
                  interval."
          ::= { dsx3CurrentEntry 4 }
      dsx3CurrentUASs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Unavailable Seconds, encountered by a DS3
                  interface in the current 15 minute interval."
          ::= { dsx3CurrentEntry 5 }
      dsx3CurrentLCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of Line
                  Coding Violations encountered by a DS3/E3
                  interface in the current 15 minute interval."
          ::= { dsx3CurrentEntry 6 }
      dsx3CurrentPCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Coding Violations, encountered by a DS3 interface

                  in the current 15 minute interval."
          ::= { dsx3CurrentEntry 7 }
      dsx3CurrentLESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of Line Errored Seconds encountered by
                  a DS3/E3 interface in the current 15 minute
                  interval."
          ::= { dsx3CurrentEntry 8 }
      dsx3CurrentCCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Coding Violations encountered
                  by a DS3 interface in the current 15 minute
                  interval."
          ::= { dsx3CurrentEntry 9 }
      dsx3CurrentCESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Errored Seconds encountered
                  by a DS3 interface in the current 15 minute
                  interval."
          ::= { dsx3CurrentEntry 10 }
      dsx3CurrentCSESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Severely Errored Seconds
                  encountered by a DS3 interface in the current 15
                  minute interval."
          ::= { dsx3CurrentEntry 11 }

      -- the DS3/E3 Interval
      -- The DS3/E3 Interval Table contains various statistics
      -- collected by each DS3/E3 Interface over the previous 24

      -- hours of operation.  The past 24 hours are broken into 96
      -- completed 15 minute intervals.
      dsx3IntervalTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3IntervalEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "The DS3/E3 Interval table."
          ::= { ds3 7 }
      dsx3IntervalEntry OBJECT-TYPE
          SYNTAX  Dsx3IntervalEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "An entry in the DS3/E3 Interval table."
          INDEX   { dsx3IntervalIndex, dsx3IntervalNumber }
          ::= { dsx3IntervalTable 1 }
      Dsx3IntervalEntry ::=
          SEQUENCE {
              dsx3IntervalIndex
                  INTEGER,
              dsx3IntervalNumber
                  INTEGER,
              dsx3IntervalPESs
                  Gauge,
              dsx3IntervalPSESs
                  Gauge,
              dsx3IntervalSEFSs
                  Gauge,
              dsx3IntervalUASs
                  Gauge,
              dsx3IntervalLCVs
                  Gauge,
              dsx3IntervalPCVs
                  Gauge,
              dsx3IntervalLESs
                  Gauge,
              dsx3IntervalCCVs
                  Gauge,
              dsx3IntervalCESs
                  Gauge,
              dsx3IntervalCSESs
                  Gauge
          }

      dsx3IntervalIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..65535)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The index value which uniquely identifies the
                  DS3/E3 interface to which this entry is
                  applicable.  The interface identified by a
                  particular value of this index is the same
                  interface as identified by the same value an
                  dsx3LineIndex object instance."
          ::= { dsx3IntervalEntry 1 }
      dsx3IntervalNumber OBJECT-TYPE
          SYNTAX  INTEGER (1..96)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "A number between 1 and 96, where 1 is the most
                  recently completed 15 minute interval and 96 is
                  the least recently completed 15 minutes interval
                  (assuming that all 96 intervals are valid)."
          ::= { dsx3IntervalEntry 2 }
      dsx3IntervalPESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Errored Seconds, encountered by a DS3 interface in
                  one of the previous 96, individual 15 minute,
                  intervals."
          ::= { dsx3IntervalEntry 3 }
      dsx3IntervalPSESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Severely Errored Seconds, encountered by a DS3
                  interface in one of the previous 96, individual 15
                  minute, intervals."
          ::= { dsx3IntervalEntry 4 }
      dsx3IntervalSEFSs OBJECT-TYPE
          SYNTAX  Gauge

          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Severely Errored Framing Seconds, encountered by a
                  DS3/E3 interface in one of the previous 96,
                  individual 15 minute, intervals."
          ::= { dsx3IntervalEntry 5 }
      dsx3IntervalUASs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Unavailable Seconds, encountered by a DS3
                  interface in one of the previous 96, individual 15
                  minute, intervals."
          ::= { dsx3IntervalEntry 6 }
      dsx3IntervalLCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of Line
                  Coding Violations encountered by a DS3/E3
                  interface in one of the previous 96, individual 15
                  minute, intervals."
          ::= { dsx3IntervalEntry 7 }
      dsx3IntervalPCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Coding Violations, encountered by a DS3 interface
                  in one of the previous 96, individual 15 minute,
                  intervals."
          ::= { dsx3IntervalEntry 8 }
      dsx3IntervalLESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
               "The number of Line Errored  Seconds  (BPVs  or

               illegal  zero  sequences) encountered by a DS3/E3
               interface in one of the previous 96, individual
               15 minute, intervals."
          ::= { dsx3IntervalEntry 9 }
      dsx3IntervalCCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Coding Violations encountered
                  by a DS3 interface in one of the previous 96,
                  individual 15 minute, intervals."
          ::= { dsx3IntervalEntry 10 }
      dsx3IntervalCESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Errored Seconds encountered
                  by a DS3 interface in one of the previous 96,
                  individual 15 minute, intervals."
          ::= { dsx3IntervalEntry 11 }
      dsx3IntervalCSESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Severely Errored Seconds
                  encountered by a DS3 interface in one of the
                  previous 96, individual 15 minute, intervals."
          ::= { dsx3IntervalEntry 12 }

      -- the DS3/E3 Total
      -- The DS3/E3 Total Table contains the cumulative sum of the
      -- various statistics for the 24 hour period preceding the
      -- current interval.
      dsx3TotalTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3TotalEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "The DS3/E3 Total table.  24 hour interval."

          ::= { ds3 8 }
      dsx3TotalEntry OBJECT-TYPE
          SYNTAX  Dsx3TotalEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "An entry in the DS3/E3 Total table."
          INDEX   { dsx3TotalIndex }
          ::= { dsx3TotalTable 1 }
      Dsx3TotalEntry ::=
          SEQUENCE {
              dsx3TotalIndex
                  INTEGER,
              dsx3TotalPESs
                  Gauge,
              dsx3TotalPSESs
                  Gauge,
              dsx3TotalSEFSs
                  Gauge,
              dsx3TotalUASs
                  Gauge,
              dsx3TotalLCVs
                  Gauge,
              dsx3TotalPCVs
                  Gauge,
              dsx3TotalLESs
                  Gauge,
              dsx3TotalCCVs
                  Gauge,
              dsx3TotalCESs
                  Gauge,
              dsx3TotalCSESs
                  Gauge
          }
      dsx3TotalIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..65535)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The index value which uniquely identifies the
                  DS3/E3 interface to which this entry is
                  applicable.  The interface identified by a
                  particular value of this index is the same
                  interface as identified by the same value an
                  dsx3LineIndex object instance."

          ::= { dsx3TotalEntry 1 }
      dsx3TotalPESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Errored Seconds, encountered by a DS3 interface in
                  the previous 24 hour interval"
          ::= { dsx3TotalEntry 2 }
      dsx3TotalPSESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Severely Errored Seconds, encountered by a DS3
                  interface in the previous 24 hour interval."
          ::= { dsx3TotalEntry 3 }
      dsx3TotalSEFSs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Severely Errored Framing Seconds, encountered by a
                  DS3/E3 interface in the previous 24 hour
                  interval."
          ::= { dsx3TotalEntry 4 }
      dsx3TotalUASs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Unavailable Seconds, encountered by a DS3
                  interface in the previous 24 hour interval."
          ::= { dsx3TotalEntry 5 }
      dsx3TotalLCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION

                  "The counter associated with the number of Line
                  Coding Violations encountered by a DS3/E3
                  interface in the previous 24 hour interval."
          ::= { dsx3TotalEntry 6 }
      dsx3TotalPCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of P-bit
                  Coding Violations, encountered by a DS3 interface
                  in the previous 24 hour interval."
          ::= { dsx3TotalEntry 7 }
      dsx3TotalLESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
               "The number of Line Errored  Seconds  (BPVs  or
               illegal  zero  sequences) encountered by a DS3/E3
               interface in the previous 24 hour interval."
          ::= { dsx3TotalEntry 8 }
      dsx3TotalCCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Coding Violations encountered
                  by a DS3 interface in the previous 24 hour
                  interval."
          ::= { dsx3TotalEntry 9 }
      dsx3TotalCESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Errored Seconds encountered
                  by a DS3 interface in the previous 24 hour
                  interval."
          ::= { dsx3TotalEntry 10 }
      dsx3TotalCSESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only

          STATUS  mandatory
          DESCRIPTION
                  "The number of C-bit Severely Errored Seconds
                  encountered by a DS3 interface in the previous 24
                  hour interval."
          ::= { dsx3TotalEntry 11 }

      -- The DS3 Far End Group
      -- Implementation of this group is optional for all systems
      -- that attach to a DS3 Interface.
      -- However, only C-bit Parity and SYNTRAN DS3 applications
      -- have the capability (option) of providing this information.
      -- The DS3 Far End Group consists of four tables:
      --   DS3 Far End Configuration
      --   DS3 Far End Current
      --   DS3 Far End Interval
      --   DS3 Far End Total

      -- The DS3 Far End Configuration Table contains
      -- configuration information
      -- reported in the C-bits from the remote end.
      dsx3FarEndConfigTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3FarEndConfigEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
             "The DS3 Far End Configuration table."
          ::= { ds3 9 }
      dsx3FarEndConfigEntry OBJECT-TYPE
          SYNTAX  Dsx3FarEndConfigEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
               "An entry in the DS3 Far End Configuration table."
          INDEX   { dsx3FarEndLineIndex }
          ::= { dsx3FarEndConfigTable 1 }
      Dsx3FarEndConfigEntry ::=
          SEQUENCE {
              dsx3FarEndLineIndex
                  INTEGER,
              dsx3FarEndEquipCode

                  DisplayString,
              dsx3FarEndLocationIDCode
                  DisplayString,
              dsx3FarEndFrameIDCode
                  DisplayString,
              dsx3FarEndUnitCode
                  DisplayString,
              dsx3FarEndFacilityIDCode
                  DisplayString
           }
      dsx3FarEndLineIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..65535)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
               "The index value which uniquely identifies the
               DS3 interface
               to which this entry is applicable.  The
               interface identified by a particular value of
               this index is the same interface as identified
               by the same value an dsx3LineIndex object
               instance."
         ::= { dsx3FarEndConfigEntry 1 }
      dsx3FarEndEquipCode OBJECT-TYPE
          SYNTAX  DisplayString (SIZE (0..10))
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
                "This is the Far End Equipment Identification code
                that describes the specific piece of equipment.
                It is sent within the Path
                Identification Message."
          ::= { dsx3FarEndConfigEntry 2 }
      dsx3FarEndLocationIDCode OBJECT-TYPE
          SYNTAX  DisplayString (SIZE (0..11))
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
                "This is the Far End Location Identification code
                that describes the specific location of the
                equipment.
                It is sent within the Path
                Identification Message."
          ::= { dsx3FarEndConfigEntry 3 }

      dsx3FarEndFrameIDCode OBJECT-TYPE
          SYNTAX  DisplayString (SIZE (0..10))
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
                "This is the Far End Frame Identification code
                that identifies where the equipment is located
                within a building at a given location.
                It is sent within the Path
                Identification Message."
          ::= { dsx3FarEndConfigEntry 4 }
      dsx3FarEndUnitCode OBJECT-TYPE
          SYNTAX  DisplayString (SIZE (0..6))
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
                "This is the Far End code
                that identifies the equipment location within a bay.
                It is sent within the Path
                Identification Message."
          ::= { dsx3FarEndConfigEntry 5 }
      dsx3FarEndFacilityIDCode OBJECT-TYPE
          SYNTAX  DisplayString (SIZE (0..38))
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
                "This code identifies a specific Far End DS3 path.
                It is sent within the Path
                Identification Message."
          ::= { dsx3FarEndConfigEntry 6 }

      -- The DS3 Far End Current
      -- The DS3 Far End Current table contains various statistics
      -- being collected for the current 15 minute interval.
      -- The statistics are collected from the far end block error
      -- code within the C-bits.
      dsx3FarEndCurrentTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3FarEndCurrentEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "The DS3 Far End Current table."
          ::= { ds3 10 }

      dsx3FarEndCurrentEntry OBJECT-TYPE
          SYNTAX  Dsx3FarEndCurrentEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "An entry in the DS3 Far End Current table."
          INDEX   { dsx3FarEndCurrentIndex }
          ::= { dsx3FarEndCurrentTable 1 }
      Dsx3FarEndCurrentEntry ::=
          SEQUENCE {
              dsx3FarEndCurrentIndex
                  INTEGER,
              dsx3FarEndTimeElapsed
                  INTEGER,
              dsx3FarEndValidIntervals
                  INTEGER,
              dsx3FarEndCurrentCESs
                  Gauge,
              dsx3FarEndCurrentCSESs
                  Gauge,
              dsx3FarEndCurrentCCVs
                  Gauge,
              dsx3FarEndCurrentUASs
                  Gauge
          }
       dsx3FarEndCurrentIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..65535)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The index value which uniquely identifies the
                  DS3 interface
                  to which this entry is applicable.  The interface
                  identified by a particular value of this index is
                  the same interface as identified by the same value
                  an dsx3LineIndex object instance."
          ::= { dsx3FarEndCurrentEntry 1 }
      dsx3FarEndTimeElapsed OBJECT-TYPE
          SYNTAX  INTEGER (0..899)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of seconds that have elapsed since the
                  beginning of the far end current error-measurement
                  period."

          ::= { dsx3FarEndCurrentEntry 2 }
      dsx3FarEndValidIntervals OBJECT-TYPE
          SYNTAX  INTEGER (0..96)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The number of previous far end intervals for
                  which valid data was collected.  The value will be
                  96 unless the interface was brought online within
                  the last 24 hours, in which case the value will be
                  the number of complete 15 minute far end intervals
                  since the interface has been online."
          ::= { dsx3FarEndCurrentEntry 3 }
      dsx3FarEndCurrentCESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of Far
                  Far End C-bit Errored Seconds encountered by a DS3
                  interface in the current 15 minute interval."
          ::= { dsx3FarEndCurrentEntry 4 }
      dsx3FarEndCurrentCSESs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Far End C-bit Severely Errored Seconds
                  encountered by a DS3 interface in the current 15
                  minute interval."
          ::= { dsx3FarEndCurrentEntry 5 }
      dsx3FarEndCurrentCCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Far End C-bit Coding Violations reported via
                  the far end block error count
                  encountered by a
                  DS3 interface in the current 15 minute interval."
          ::= { dsx3FarEndCurrentEntry 6 }

      dsx3FarEndCurrentUASs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Far End unavailable seconds
                  encountered by a
                  DS3 interface in the current 15 minute interval."
          ::= { dsx3FarEndCurrentEntry 7 }

      -- The DS3 Far End Interval
      -- The DS3 Far End Interval Table contains various statistics
      -- collected by each DS3 interface over the previous 24
      -- hours of operation.  The past 24 hours are broken into 96
      -- completed 15 minute intervals.
      dsx3FarEndIntervalTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3FarEndIntervalEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                 "The DS3 Far End Interval table."
          ::= { ds3 11 }
      dsx3FarEndIntervalEntry OBJECT-TYPE
          SYNTAX  Dsx3FarEndIntervalEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                "An entry in the DS3 Far
                End Interval table."
          INDEX   { dsx3FarEndIntervalIndex,
                    dsx3FarEndIntervalNumber }
          ::= { dsx3FarEndIntervalTable 1 }
      Dsx3FarEndIntervalEntry ::=
          SEQUENCE {
               dsx3FarEndIntervalIndex
                    INTEGER,
               dsx3FarEndIntervalNumber
                    INTEGER,
               dsx3FarEndIntervalCESs
                    Gauge,
               dsx3FarEndIntervalCSESs
                    Gauge,

               dsx3FarEndIntervalCCVs
                    Gauge,
               dsx3FarEndIntervalUASs
                    Gauge
          }
      dsx3FarEndIntervalIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..65535)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The index value which uniquely identifies the
                  DS3 interface
                  to which this entry is applicable.  The
                  interface identified by a particular value of
                  this index is the same interface as identified
                  by the same value an dsx3LineIndex object
                  instance."
          ::= { dsx3FarEndIntervalEntry 1 }
      dsx3FarEndIntervalNumber OBJECT-TYPE
         SYNTAX  INTEGER (1..96)
         ACCESS  read-only
         STATUS  mandatory
         DESCRIPTION
                "A number between 1 and 96, where 1 is the most
                recently completed 15 minute interval and 96 is
                the least recently completed 15 minutes
                interval (assuming that all 96 intervals are
                valid)."
         ::= { dsx3FarEndIntervalEntry 2 }
      dsx3FarEndIntervalCESs OBJECT-TYPE
         SYNTAX  Gauge
         ACCESS  read-only
         STATUS  mandatory
         DESCRIPTION
                 "The counter associated with the number of
                  Far End C-bit Errored Seconds encountered
                  by a DS3 interface in one of the previous 96,
                  individual 15 minute, intervals."
        ::= { dsx3FarEndIntervalEntry 3 }
      dsx3FarEndIntervalCSESs OBJECT-TYPE
         SYNTAX  Gauge
         ACCESS  read-only
         STATUS  mandatory
         DESCRIPTION

                 "The counter associated with the number of
                 Far End C-bit Severely Errored Seconds
                 encountered by a DS3 interface in one of the
                 previous 96, individual 15 minute, intervals."
        ::= { dsx3FarEndIntervalEntry 4 }
      dsx3FarEndIntervalCCVs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Far End C-bit Coding Violations reported via
                  the far end block error count
                  encountered by a
                  DS3 interface in one of the previous 96,
                  individual 15 minute, intervals."
          ::= { dsx3FarEndIntervalEntry 5 }
      dsx3FarEndIntervalUASs OBJECT-TYPE
          SYNTAX  Gauge
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The counter associated with the number of
                  Far End unavailable seconds
                  encountered by a
                  DS3 interface in one of the previous 96,
                  individual 15 minute, intervals."
          ::= { dsx3FarEndIntervalEntry 6 }

      -- The DS3 Far End Total
      -- The DS3 Far End Total Table contains the cumulative sum
      -- of the various statistics for the 24 hour period preceding
      -- the current interval.
      dsx3FarEndTotalTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3FarEndTotalEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "The DS3 Far End Total table.  24 hour interval."
          ::= { ds3 12 }
      dsx3FarEndTotalEntry OBJECT-TYPE
          SYNTAX  Dsx3FarEndTotalEntry

          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
                  "An entry in the DS3 Far End Total table."
          INDEX   { dsx3FarEndTotalIndex }
          ::= { dsx3FarEndTotalTable 1 }
      Dsx3FarEndTotalEntry ::=
          SEQUENCE {
              dsx3FarEndTotalIndex
                  INTEGER,
              dsx3FarEndTotalCESs
                  Gauge,
              dsx3FarEndTotalCSESs
                  Gauge,
              dsx3FarEndTotalCCVs
                  Gauge,
              dsx3FarEndTotalUASs
                  Gauge
          }
      dsx3FarEndTotalIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..65535)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
                  "The index value which uniquely identifies the
                  DS3 interface
                  to which this entry is applicable.  The interface
                  identified by a particular value of this index is
                  the same interface as identified by the same value
                  an dsx3LineIndex object instance."
          ::= { dsx3FarEndTotalEntry 1 }
      dsx3FarEndTotalCESs OBJECT-TYPE
         SYNTAX  Gauge
         ACCESS  read-only
         STATUS  mandatory
         DESCRIPTION
                 "The counter associated with the number of Far
                 End C-bit Errored Seconds encountered by a DS3
                 interface in the previous 24 hour interval."
         ::= { dsx3FarEndTotalEntry 2 }
      dsx3FarEndTotalCSESs OBJECT-TYPE
         SYNTAX  Gauge
         ACCESS  read-only
         STATUS  mandatory

         DESCRIPTION
                 "The counter associated with the number of
                 Far End C-bit Severely Errored Seconds
                 encountered by a DS3 interface in the previous 24
                 hour interval."
         ::= { dsx3FarEndTotalEntry 3 }
      dsx3FarEndTotalCCVs OBJECT-TYPE
         SYNTAX  Gauge
         ACCESS  read-only
         STATUS  mandatory
         DESCRIPTION
                 "The counter associated with the number of
                 Far End C-bit Coding Violations reported via the
                 far end block error count
                 encountered by a
                 DS3 interface in the previous 24 hour interval."
         ::= { dsx3FarEndTotalEntry 4 }
      dsx3FarEndTotalUASs OBJECT-TYPE
         SYNTAX  Gauge
         ACCESS  read-only
         STATUS  mandatory
         DESCRIPTION
                 "The counter associated with the number of
                 Far End unavailable seconds
                 encountered by a
                 DS3 interface in the previous 24 hour interval."
         ::= { dsx3FarEndTotalEntry 5 }

      -- the DS3/E3 Fractional Group
      -- Implementation of this group is optional.  It is designed
      -- for those systems dividing a DS3/E3 into channels
      -- containing different data streams that are of local
      -- interest.
      -- The DS3/E3 fractional table identifies which DS3/E3
      -- channels associated with a CSU are being used to
      -- support a logical interface, i.e., an entry in the
      -- interfaces table from the Internet-standard MIB.
      -- For example, consider a DS3 device with 4 high speed links
      -- carrying router traffic, a feed for voice, a feed for
      -- video, and a synchronous channel for a non-routed
      -- protocol.
      -- We might describe the allocation of channels, in the

      -- dsx3FracTable, as follows:
      -- dsx3FracIfIndex.2. 1 = 3    dsx3FracIfIndex.2.15 = 4
      -- dsx3FracIfIndex.2. 2 = 3    dsx3FracIfIndex.2.16 = 6
      -- dsx3FracIfIndex.2. 3 = 3    dsx3FracIfIndex.2.17 = 6
      -- dsx3FracIfIndex.2. 4 = 3    dsx3FracIfIndex.2.18 = 6
      -- dsx3FracIfIndex.2. 5 = 3    dsx3FracIfIndex.2.19 = 6
      -- dsx3FracIfIndex.2. 6 = 3    dsx3FracIfIndex.2.20 = 6
      -- dsx3FracIfIndex.2. 7 = 4    dsx3FracIfIndex.2.21 = 6
      -- dsx3FracIfIndex.2. 8 = 4    dsx3FracIfIndex.2.22 = 6
      -- dsx3FracIfIndex.2. 9 = 4    dsx3FracIfIndex.2.23 = 6
      -- dsx3FracIfIndex.2.10 = 4    dsx3FracIfIndex.2.24 = 6
      -- dsx3FracIfIndex.2.11 = 4    dsx3FracIfIndex.2.25 = 6
      -- dsx3FracIfIndex.2.12 = 5    dsx3FracIfIndex.2.26 = 6
      -- dsx3FracIfIndex.2.13 = 5    dsx3FracIfIndex.2.27 = 6
      -- dsx3FracIfIndex.2.14 = 5    dsx3FracIfIndex.2.28 = 6
      -- For dsx3M23, dsx3SYNTRAN, dsx3CbitParity, and
      -- dsx3ClearChannel there are 28 legal channels, numbered 1
      -- through 28.
      -- For e3Framed there are 16 legal channels,
      -- numbered 1 through 16.  The channels (1..16) correspond
      -- directly to the equivalently numbered time-slots.
      dsx3FracTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3FracEntry
          ACCESS  not-accessible
          STATUS  mandatory
          DESCRIPTION
             "The DS3 Fractional table."
          ::= { ds3 13 }
      dsx3FracEntry OBJECT-TYPE
           SYNTAX  Dsx3FracEntry
           ACCESS  not-accessible
           STATUS  mandatory
           DESCRIPTION
              "An entry in the DS3 Fractional table."
          INDEX   { dsx3FracIndex, dsx3FracNumber }
          ::= { dsx3FracTable 1 }
      Dsx3FracEntry ::=
          SEQUENCE {
              dsx3FracIndex
                  INTEGER,
              dsx3FracNumber
                  INTEGER,

              dsx3FracIfIndex
                  INTEGER
          }

      dsx3FracIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..'7fffffff'h)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
             "The index value which uniquely identifies  the
             DS3  interface  to which this entry is applicable
             The interface identified by a  particular
             value  of  this  index is the same interface as
             identified by the same value  an  dsx3LineIndex
             object instance."
         ::= { dsx3FracEntry 1 }
      dsx3FracNumber OBJECT-TYPE
          SYNTAX  INTEGER (1..31)
          ACCESS  read-only
          STATUS  mandatory
          DESCRIPTION
             "The channel number for this entry."
         ::= { dsx3FracEntry 2 }
      dsx3FracIfIndex OBJECT-TYPE
          SYNTAX  INTEGER (1..'7fffffff'h)
          ACCESS  read-write
          STATUS  mandatory
          DESCRIPTION
             "An index value that uniquely identifies an
             interface.  The interface identified by a particular
             value of this index is the same  interface
             as  identified by the same value an ifIndex
             object instance. If no interface is currently using
             a channel, the value should be zero.  If a
             single interface occupies more  than  one  time
             slot,  that ifIndex value will be found in multiple
             time slots."
         ::= { dsx3FracEntry 3 }

      END

Acknowledgments

This document was produced by the Trunk MIB Working Groups:

                Tracy Cox       Bellcore
                Fred Baker      Advanced Computer Communications
                James Watt      Newbridge
                Bill Versteeg   Versteeg Codeworks
                Steve Buchko    Newbridge
                Greg Calmainis  Newbridge
                Kaj Tesink      Bellcore
                Al Bryenton     Bell Northern Research
                Tom Easterday   CIC
                John Labbe      Merit Corporation
                Chris Sullivan  Gandalf Ltd
                Grant Hall      Gandalf Ltd
                John Guerrero   Digital Link
                Rich Bradford   BBN
                Kurt Luoto      Digital Link
                Myron Hattig    Kentrox
                Ed Pring        IBM
                Larry Marks     IBM
                Kurt Hall       Clear Communications Corp.
                Jason Perreault Coral Network Corp.
                Paul Farah      T3plus
                George Kajos    Coral Network Corp.

References

[1] Cerf, V., "IAB Recommendations for the Development of Internet

   Network Management Standards", RFC 1052, NRI, April 1988.

[2] Cerf, V., "Report of the Second Ad Hoc Network Management Review

   Group", RFC 1109, NRI, August 1989.

[3] 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.

[4] 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.

[5] 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.

[6] McCloghrie K., and M. Rose, Editors, "Management Information Base

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

[7] Information processing systems - Open Systems Interconnection -

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

[8] 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.

[9] American National Standard for Telecommunications - Digital

   Hierarchy - Electrical Interfaces, ANSI T1.102- 1987.
 [10] American National Standard for Telecommunications - Digital
   Hierarchy - Formats Specification, ANSI T1.107- 1988.
[10a] ANSI T1.107a-1990.
 [11] American National Standard for Telecommunications - Carrier-to-
   Customer Installation - DS3 Metallic Interface, ANSI T1.404-1989.
 [12] American National Standard for Telecommunications -- Layer 1 In-
   Service Digital Transmission Performance Monitoring T1M1/92-0xx,
   T1M1.3/92-005R1, April 1992.
 [13] Rose, M., and K. McCloghrie, Editors, "Concise MIB Definitions",
   STD 16, RFC 1212, Performance Systems International, Hughes LAN
   Systems, March 1991.
 [14] CCITT - Digital Multiplex Equipment Operating at the Third Order
   Bit Rate of 34 368 Kbit/s and the Forth Order Bit Rate of 139 264
   Kbit/s and Using Positive Justification, G.751.
 [15] European Telecommunications Standards Institute -- ETS "34M" --
   Metropolitan Area Network Physical Convergence Layer Procedure
   for 34.368 Megabits per Second, T/NA(91)18, May 1991.

Security Considerations

Security issues are not discussed in this memo.

Authors' Addresses

Tracy A. Cox Bell Communications Research 331 Newman Springs Road P.O. Box 7020 Red Bank, NJ 07701-7020 Phone: (908) 758-2107 EMail: [email protected]

Kaj Tesink Bell Communications Research 331 Newman Springs Road P.O. Box 7020 Red Bank, NJ 07701-7020 Phone: (908) 758-5254 EMail: [email protected]