Network Working Group                                           T. Brown
Request for Comments: 1595                                     K. Tesink
Category: Standards Track                                        Editors
                                           Bell Communications Research
                                                             March 1994


                    Definitions of Managed Objects
                   for the SONET/SDH Interface Type

Status of this Memo

  This document specifies an Internet standards track protocol for the
  Internet community, and requests discussion and suggestions for
  improvements.  Please refer to the current edition of the "Internet
  Official Protocol Standards" (STD 1) 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 Synchronous Optical
  Network/Synchronous Digital Hierarchy (SONET/SDH) objects.  This
  document is a companion document with Definitions of Managed Objects
  for the DS1/E1 and DS3/E3 Interface Types, RFC1406 [14] and RFC1407
  [13].

  This memo specifies a MIB module in a manner that is both compliant
  to the SNMPv2 SMI, and semantically identical to the peer SNMPv1
  definitions.

Table of Contents

  1. The SNMPv2 Network Management Framework ...............    2
  2. Objects ...............................................    3
  2.1 Format of Definitions ................................    3
  3. Overview ..............................................    4
  3.1 Use of the ifTable ...................................    4
  3.2 Use of ifTable for  SONET/SDH  Medium/Section/Line
      Layer ................................................    6
  3.3 Use of ifTable for SONET/SDH Paths. ..................    7
  3.4 Use of ifTable for SONET/SDH VTs/VCs .................    8
  3.5 SONET/SDH Terminology ................................    9
  3.6 Values for x for the Section, Line, Path,  and  VT
      Layers ...............................................   16
  4. Object Definitions ....................................   17
  4.1 The SONET/SDH Medium Group ...........................   18



AToM MIB Working Group                                          [Page 1]

RFC 1595                   SONET/SDH Objects                  March 1994


  4.2 The SONET/SDH Section Group ..........................   21
  4.2.1 The SONET/SDH Section Current Group ................   21
  4.2.2 The SONET/SDH Section Interval Group ...............   23
  4.3 The SONET/SDH Line Group .............................   25
  4.3.1 The SONET/SDH Line Current Group ...................   25
  4.3.2 The SONET/SDH Line Interval Group ..................   27
  4.4 The SONET/SDH Far End Line Group .....................   30
  4.4.1 The SONET/SDH Far End Line Current Group ...........   30
  4.4.2 The SONET/SDH Far End Line Interval Group ..........   32
  4.5 The SONET/SDH Path Group .............................   34
  4.5.1 The SONET/SDH Path Current Group ...................   34
  4.5.2 The SONET/SDH Path Interval Group ..................   37
  4.6 The SONET/SDH Far End Path Group .....................   39
  4.6.1 The SONET/SDH Far End Path Current Group ...........   39
  4.6.2 The SONET/SDH Far End Path Interval Group ..........   41
  4.7 The SONET/SDH Virtual Tributary Group ................   43
  4.7.1 The SONET/SDH VT Current Group .....................   43
  4.7.2 The SONET/SDH VT Interval Group ....................   46
  4.8 The SONET/SDH Far End VT Group .......................   48
  4.8.1 The SONET/SDH Far End VT Current Group .............   48
  4.8.2 The SONET/SDH Far End VT Interval Group ............   50
  4.9 Conformance Information ..............................   52
  4.10 Compliance Statements ...............................   52
  5. Acknowledgments .......................................   56
  6. References ............................................   57
  7. Security Considerations ...............................   59
  8. Authors' Addresses ....................................   59

1.  The SNMPv2 Network Management Framework

  The SNMPv2 Network Management Framework consists of four major
  components.  They are:

     RFC 1442 [1] which defines the SMI, the mechanisms used for
     describing and naming objects for the purpose of management.

     STD 17, RFC 1213 [6] defines MIB-II, the core set of managed
     objects for the Internet suite of protocols. Reference [12]
     defines the evolution of the Interfaces Group of MIB II in terms
     of extensions and precise applications of the objects.

     RFC 1445 [4] which defines the administrative and other
     architectural aspects of the framework.

     RFC 1448 [5] which defines the protocol used for network access to
     managed objects.





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RFC 1595                   SONET/SDH Objects                  March 1994


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

  This specification makes also use of:

     RFC 1443 [2] which defines textual conventions for the
     specification of managed objects.

     RFC 1444 [3] which defines conformance statements for the
     specification of managed objects.

2.  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 RFC 1442 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.

2.1.  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 the SNMPv2 SMI.








AToM MIB Working Group                                          [Page 3]

RFC 1595                   SONET/SDH Objects                  March 1994


3.  Overview

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

              sonet (39), sonetPath (50), sonetVT (51)

  The definitions contained herein are based on the SONET/SDH
  specifications in ANSI T1.105 and T1.106-1988 [9, 9a, 10] and CCITT
  G.707, 708, 709, and G.783 [15-18].

3.1.  Use of the ifTable

  This section specifies how the MIB II interfaces group, as defined in
  [12], is used for SONET/SDH interfaces.  The SONET/SDH layers support
  several multiplexing possibilities.

  For example in SONET, an Synchronous Transport Signal 3 (STS-3) has 3
  SONET Paths, and a STS-3c has 1 SONET Path. Another example could be
  a STS-12 having 4 SONET STS-3c Paths.  Similarly, a SONET Synchronous
  Payload Envelope (SPE) can carry many Virtual Tributaries (VTs), for
  example, one SONET SPE can carry 28 VT1.5s.  It is important to note
  that an SPE and a VT in SONET is collectively referred to as a
  Virtual Container (VC) in SDH.  Also, an STS is called Synchronous
  Transport Module (STM) in SDH.

  Not all SONET/SDH equipment terminate all SONET/SDH layers.  For
  example, an SONET/SDH STE regenerator terminates SONET/SDH Sections
  only, and is transparent for all layers above that.  SONET/SDH Add-
  Drop multiplexers and Digital Cross Connect Systems terminate
  SONET/SDH Lines. SONET/SDH Terminal Multiplexers may also terminate
  SONET/SDH Paths and VTs/VCs.

  MIB II [6], as extended by [12], accommodates these cases by
  appropriate use of the MIB II system group, and the interfaces group.
  The system group can name and describe the type of managed resource.
  The interfaces group defines which SONET/SDH layers apply, how these
  layers are configured and multiplexed.  This is achieved by proper
  representation of SONET/SDH Layers by ifEntries as defined in [12],
  as follows:









AToM MIB Working Group                                          [Page 4]

RFC 1595                   SONET/SDH Objects                  March 1994


                       _____________________________
                      |             |          |    |  >
                      |             |          |    |  |
                      |    VT 1     |..........|VT K|   > K ifEntries
                      |             |          |    |  |
                      |_____________|__________|____|  >
                      |               |      |      |  >
                      |               |      |      |  |
                      |    Path 1     |......|Path L|   > L ifEntries
                      |               |      |      |  |
                      |_______________|______|______|  >
                      |                             |  >
                      |                             |  |
                      |    Line                     |  |
                      |                             |  |
                      |_____________________________|  |
                      |                             |  |
                      |                             |  |
                      |    Section Layer            |   > 1 ifEntry
                      |                             |  |
                      |_____________________________|  |
                      |                             |  |
                      |                             |  |
                      |    Physical Medium Layer    |  |
                      |                             |  |
                      |_____________________________|  >

                      Use of ifTable for a SONET/SDH port

  The exact configuration and multiplexing of the layers is maintained
  in the ifStackTable [12].




















AToM MIB Working Group                                          [Page 5]

RFC 1595                   SONET/SDH Objects                  March 1994


3.2.  Use of ifTable for SONET/SDH Medium/Section/Line Layer

  Only the ifGeneralGroup needs to be supported.

ifTable Object    Use for combined SONET/SDH Medium/Section/Line Layer
======================================================================
          ifIndex           Interface index.

          ifDescr           SONET/SDH Medium/Section/Line

          ifType            sonet(39)

          ifSpeed           Speed of line rate for SONET/SDH,
                            (e.g., 155520000 bps).

          ifPhysAddress     The value of the Circuit Identifier.
                            If no Circuit Identifier has been assigned
                            this object should have an octet string with
                            zero length.

          ifAdminStatus     Supports read-only access.
                            The desired administrative status of the
                            interface.

          ifOperStatus      The value testing(3) is not used.
                            This object assumes the value down(2),
                            if the objects sonetSectionCurrentStatus
                            and sonetLineCurrentStatus have
                            any other value than sonetSectionNoDefect(1)
                            and sonetLineNoDefect(1), respectively.

          ifLastChange      sysUpTime at the last change in
                            ifOperStatus.

          ifName            Textual name of the interface or an
                            OCTET STRING of zero length.

          ifLinkUpDownTrapEnable   Set to enabled(1).
                                   Supports read-only access.

          ifHighSpeed       Speed of line in Mega-bits per second
                            (e.g., 155 Mbps)

          ifConnectorPresent Set to true(1).







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RFC 1595                   SONET/SDH Objects                  March 1994


3.3.  Use of ifTable for SONET/SDH Paths

  Only the ifGeneralGroup needs to be supported.

         ifTable Object    Use for SONET/SDH Paths
         =========================================
          ifIndex           Interface index.

          ifDescr           SONET/SDH Path

          ifType            sonetPath(50)

          ifSpeed           set to speed of SONET/SDH path
                            (e.g., an STS-1 path has a
                            rate of 50112000 bps.)

          ifPhysAddress     Circuit Identifier or OCTET STRING of
                            zero length.

          ifAdminStatus     Supports read-only access.
                            The desired administrative status of the
                            interface.

          ifOperStatus      This object assumes the value down(2),
                            if the object sonetPathCurrentStatus has
                            any other value than sonetPathNoDefect(1).

          ifLastChange      sysUpTime at the last change in ifOperStatus.

          ifName            Textual name of the interface or an
                            OCTET STRING of zero length.

          ifLinkUpDownTrapEnable   Default value is disabled(2).
                                   Just read-only access may be
                                   supported.

          ifHighSpeed       Set to rate of SONET/SDH path
                            in Mega-bits per second.

          ifConnectorPresent Set to false(2).











AToM MIB Working Group                                          [Page 7]

RFC 1595                   SONET/SDH Objects                  March 1994


3.4.  Use of ifTable for SONET/SDH VTs/VCs

  Only the ifGeneralGroup needs to be supported.

         ifTable Object    Use for SONET/SDH VTs/VCs
         ===========================================
          ifIndex           Interface index.

          ifDescr           SONET/SDH VT/VC

          ifType            sonetVT(51)

          ifSpeed           Set to speed of VT/VC
                            (e.g., a VT1.5 has a rate of
                            1728000 bps.)

          ifPhysAddress     Circuit Identifier or OCTET STRING of
                            zero length.

          ifAdminStatus     Supports read-only access.
                            The desired administrative status of the
                            interface.

          ifOperStatus      This object assumes the value down(2),
                            if the object sonetVTCurrentStatus has
                            any other value than sonetVTNoDefect(1).

          ifLastChange      sysUpTime at the last change in
                            ifOperStatus.

          ifName            Textual name of the interface or an
                            OCTET STRING of zero length.

          ifLinkUpDownTrapEnable   Default value is disabled(2).
                                   Just read-only access may be
                                   supported.

          ifHighSpeed       Set to rate of VT in Mega-bits per second.

          ifConnectorPresent Set to false(2).











AToM MIB Working Group                                          [Page 8]

RFC 1595                   SONET/SDH Objects                  March 1994


3.5.  SONET/SDH Terminology

  The terminology used in this document to describe error conditions on
  a SONET circuit as monitored by a SONET system are from the ANSI
  T1M1.3/93-005R2 [11].  The terminology used in this document to
  describe error conditions on a SDH circuit as monitored by a SDH
  system are from the CCITT G.783 [18].  Only the SONET Performance
  Monitoring terminology is defined in this document.  The definitions
  for SDH Performance Monitoring terms are similar but not identical,
  and they can be found in [18].  If the definition in this document
  does not match the definition in the ANSI T1M1.3/93-005R2 draft
  document, the implementer should follow the definition described in
  this document.

         Section Loss Of Frame Failure (Out of Frame Event, Severely
              Errored Frame Defect)
              An Out of Frame (OOF) event (or Severely Errored Frame
              defect) is the occurrence of four contiguous errored
              frame alignment words.  A frame alignment work occupies
              the A1 and A2 bytes of an STS frame, and is defined in
              T1.105.  The SEF defect is terminated when two contiguous
              error-free frame words are detected.  Any implementation
              of the frame recovery circuitry which achieves
              realignment following an OOF within the 250 microsecond
              (two frames) interval implied by this definition is
              acceptable.

              An Loss of Frame (LOF) defect is declared when an OOF/SEF
              defect persists for a period of 3 milliseconds.  The LOF
              defect is terminated when the incoming signal remains
              continuously in-frame for a period of 1 ms to 3 ms.

              An LOF failure is declared when the LOF defect persists
              for a period of 2.5 +/- 0.5 seconds, except when an LOS
              defect or failure is present.  The LOF failure is cleared
              when the LOS failure is declared, or when the LOF defect
              is absent for 10 +/- 0.5 seconds.

         Loss of Signal
              The Loss of Signal (LOS) defect is declared when no
              transitions are detected on the incoming signal (before
              descrambling).  The LOS defect is detected  upon
              observing 2.3 to 100 microseconds of no transitions.  The
              LOS defect is cleared after a 125 microsecond interval
              (one frame) during which no LOS defect is detected.

              The LOS failure is declared when the LOS defect persists
              for a period of 2.5 +/- 0.5 seconds, or if LOS defect is



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RFC 1595                   SONET/SDH Objects                  March 1994


              present when the criteria for LOF failure declaration
              have been met.  The LOS failure is cleared when the LOS
              defect is absent for a period of 10 +/- 0.5 seconds.
              Declaration of LOS failure clears any existing LOF
              failure.  Clearing the LOS failure allows immediate
              declaration of the LOF failure if conditions warrant.

         STS-Path Loss of Pointer
              An Loss of Pointer (LOP) defect is declared when either a
              valid pointer is not detected in eight consecutive
              frames, or when eight consecutive frames are detected
              with the New Data Flag (NDF) set to "1001" without a
              valid concatenation indicator (see ANSI T1.105).  A LOP
              defect is terminated when either a valid pointer with a
              normal NDF set to "0110", or a valid concatenation
              indicator is detected for three contiguous frames.
              Incoming STS-Path AIS shall not result in the declaration
              of a LOP defect.

              A STS-Path LOP failure is declared when the STS-Path LOP
              defect persists for a period of 2.5 +/- 0.5 seconds.  A
              STS-Path LOP failure is cleared when the STS-Path LOP
              defect is absent for 10 +/- 0.5 seconds.

         VT Loss of Pointer
              A VT LOP defect is declared when either a valid pointer
              is not detected in eight consecutive VT superframes, or
              when eight consecutive VT superframes are detected with
              the NDF set to "1001" without a valid concatenation
              indicator.  A VT LOP defect is terminated when either a
              valid pointer with a normal NDF set to "0110", or a valid
              concatenation indicator is detected for three contiguous
              VT superframes.  Incoming VT-Path AIS shall not result in
              declaring a VT LOP defect.

              A VT LOP failure is declared when the VT LOP defect
              persists for 2.5 +/- 0.5 seconds.  A VT LOP failure is
              cleared when the VT LOP defect is absent for 10 +/- 0.5
              seconds.

         Line Alarm Indication Signal
              A Line Alarm Indication Signal (L-AIS) is defined in ANSI
              T1.105.  The following criteria are specific to the L-AIS
              defect:

              --  Line AIS defect is detected as a "111" pattern in
              bits 6, 7, and 8 of the K2 byte in five consecutive
              frames.



AToM MIB Working Group                                         [Page 10]

RFC 1595                   SONET/SDH Objects                  March 1994


              --  Line AIS defect is terminated when bits 6, 7, and 8
              of the K2 byte do not contain the code "111" for five
              consecutive frames.

              A Line AIS failure is declared when the Line AIS defect
              persists for a period of 20.5 +/- 0.5 seconds.  A Line
              AIS failure is cleared when the Line AIS defect is absent
              for 10 +/- 0.5 seconds.

         STS-Path Alarm Indication Signal
              The STS-Path Alarm Indication Signal (AIS) is defined in
              ANSI T1.105 as all ones in bytes H1, H2, and H3 as well
              as all ones in the entire STS SPE.  The following
              criteria are specific to the STS-Path AIS defect:

              -- STS-Path AIS defect is detected as all ones in bytes
              H1 and H2 in three contiguous frames.

              -- The STS-Path AIS defect is terminated when a valid STS
              Pointer is detected with the NDF set to "1001" (inverted)
              for one frame, or  "0110" (normal) for three contiguous
              frames.

              A STS-Path AIS failure is declared when the STS-Path AIS
              defect persists for 2.5 +/- 0.5 seconds.  A STS-Path AIS
              failure is cleared when the STS-Path AIS defect is absent
              for 10 +/- 0.5 seconds.

         VT-Path Alarm Indication Signal
              The VT-Path Alarm Indication Signal (AIS) is only
              applicable for VTs in the floating mode of operation.
              VT-Path AIS is used to alert the downstream VT Path
              Terminating Entity (PTE) of an upstream failure.  Upon
              detection of a failure, Line AIS, or STS-Path AIS, an STS
              PTE will generate downstream VT-Path AIS if the STS
              Synchronous Payload Envelope (SPE) is carrying floating
              VTs.  VT-Path AIS is specified in ANSI T1.105 as all ones
              in bytes V1, V2, V3, and V4, as well as all ones in the
              entire VT SPE.  The following criteria are specific to
              VT-Path AIS defect:

              --  VT-Path AIS defect is detected by a VT PTE as all
              ones in bytes V1 and V2 in three contiguous VT
              superframes.

              --  VT-Path AIS defect is terminated when valid VT
              pointer with a valid VT size is detected with the NDF set
              to "1001" (inverted) for one VT superframe, or "0110"



AToM MIB Working Group                                         [Page 11]

RFC 1595                   SONET/SDH Objects                  March 1994


              (normal) for three contiguous VT superframes are
              detected.

              A VT-Path AIS failure is declared when the VT-Path AIS
              defect persists for 2.5 +/- 0.5 seconds.  A VT-Path AIS
              failure is cleared when the VT-Path AIS defect is absent
              for 10 +/- 0.5 seconds.

         Line Remote Defect Indication
              Line Remote Defect Indication (RDI) (aka Line FERF)
              signal is the occurrence of a "110" pattern in bit
              positions 6, 7, and 8 of the K2 byte in STS-1 #1 of the
              STS-N signal.  Line RDI is defined in ANSI T1.105.  The
              following criteria are specific to Line RDI defect:

              --  Line RDI defect is a "110" code in bits 6, 7, and 8
              of the K2 byte of in STS-1 #1 in five consecutive frames.

              --  Line RDI defect is terminated when any code other
              than "110" is detected in bits 6, 7, and 8 of the K2 byte
              in five consecutive frames.

              A Line Remote Failure Indication (RFI) failure is
              declared when the incoming Line RDI defects lasts for 2.5
              +/- 0.5 seconds.  The Line RFI failure is cleared when no
              Line RDI defects are detected for 10 +/- 0.5 seconds.

         STS-Path Remote Defect Indication
              STS-Path RDI (aka STS-Path FERF) signal shall be
              generated within 100 milliseconds by the STS PTE upon
              detection of an AIS or LOP defect.  Transmission of the
              STS-Path RDI signal shall cease within 100 milliseconds
              when the STS PTE no longer detects STS-Path AIS or STS-
              Path LOP defect.  The STS-Path RDI  shall accurately
              report the presence or absence of STS-Path AIS or STS-
              Path LOP defects.  STS-Path RDI defect is defined in ANSI
              T1.105.  The following requirements are specific to the
              STS-Path RDI defect:

              --  STS-Path RDI is detected by all STS PTEs.  STS-Path
              RDI is detected by the upstream STS PTE as a "1" in bit
              five of the Path Status byte (G1) for five contiguous
              frames.

              --  Removal of STS-Path Remote Defect Indication is
              detected by a "0" in bit 5 of the G1 byte in five
              contiguous frames.




AToM MIB Working Group                                         [Page 12]

RFC 1595                   SONET/SDH Objects                  March 1994


              A STS-Path Remote Failure Indication (RFI) failure is
              declared when the incoming STS-Path RDI defects lasts for
              2.5 +/- 0.5 seconds.  The STS-Path RFI failure is cleared
              when no STS-Path RDI defects are detected for 10 +/- 0.5
              seconds.

         VT-Path Remote Defect Indication
              VT Path RDI (aka VT Path FERF) signal shall be generated
              within 100 milliseconds by the VT PTE upon detection of a
              VT-Path AIS or LOP defect.  Transmission of the VT-Path
              RDI signal shall cease within 100 milliseconds when the
              VT PTE no longer detects VT-Path AIS or VT-Path LOP
              defect.  The VT-Path RDI  shall accurately report the
              presence or absence of VT-Path AIS or VT-Path LOP
              defects.  VT-Path RDI defect is defined in ANSI T1.105.
              The following requirements are specific to VT-Path RDI
              defect:

              --  VT-Path RDI defect is the occurrence of a "1" in bit
              4 of the VT-Path Overhead byte (V5) in five contiguous
              frames.

              --  VT-Path RDI defect is terminated when a "0" is
              detected in bit 4 of the VT-Path Overhead byte (V5) for
              five contiguous frames.

              A VT-Path Remote Failure Indication (RFI) (derived)
              failure is declared when the incoming VT-Path RDI defects
              lasts for 2.5 +/- 0.5 seconds.  The VT-Path RFI failure
              is cleared when no VT-Path RDI defects are detected for
              10 +/- 0.5 seconds.

         VT-Path Remote Failure Indication
              The VT-Path RFI signal is only required for the case of
              byte synch mapped DS1s where the DS1 frame bit is not
              mapped.  The VT-Path RFI is specified in ANSI T1.105,
              where it is currently called VT path yellow.  When
              provided, the VT-Path RFI signal is used to indicate the
              occurrence of far-end failures.  When the VT-Path RFI is
              not provided, far-end failures are derived from local
              timing of the VT-Path RDI defect.  The VT-Path RFI
              failure is declared within 5 ms of detecting the incoming
              VT-Path RFI Signal.  The VT-Path Remote Failure
              Indication (RFI) failure is cleared within 50 ms of
              detecting the removal of the incoming VT-Path RFI signal.






AToM MIB Working Group                                         [Page 13]

RFC 1595                   SONET/SDH Objects                  March 1994


         Coding Violation
              Coding Violations (CV) are Bit Interleaved Parity (BIP)
              errors that are detected in the incoming signal.  CV
              counters are incremented for each BIP error detected.
              That is, each BIP-8 can detect up to eight errors per
              STS-N frame, with each error incrementing the CV counter.
              Section CVs shall be collected using the BIP-8 in the B1
              byte located in the Section Overhead of STS-1 #1.  Line
              CVs shall be collected using the BIP-8s in B2 bytes
              located in the Line Overhead of each STS-1 (since all CVs
              on an STS-N line are counted together, this is equivalent
              to counting each error in the BIP-8*N contained in the B2
              bytes of the STS-N Line Overhead).  Thus, on an STS-N
              signal, up to 8 x N CVs may occur in each frame.  Path
              CVs shall be collected using the BIP-8 in the B3 byte of
              the STS-Path Overhead of the STS SPE.  VT CVs shall be
              collected using the BIP-2 in the V5 overhead byte of the
              floating VT.

         Errored Seconds
              At each layer, an Errored Second (ES) is a second with
              one or more Coding Violations at that layer OR one or
              more incoming defects (e.g., SEF, LOS, AIS, LOP) at that
              layer has occurred.

         Severely Errored Seconds
              At each layer, an Severely Errored Second (SES) is a
              second with x or more CVs at that layer, or a second
              during which at least one or more incoming defects at
              that layer has occurred.  Values of x vary depending on
              the line rate and the Bit Error Rate.  See Section 3.4
              for values for x.

         Severely Errored Framing Seconds
              A Severely Errored Framing Second (SEFS) is a seconds
              with containing one or more SEF events.  This counter is
              only counted at the Section Layer.

         Unavailable Seconds
              At the Line, Path, and VT layers, an unavailable second
              is calculated by counting the number of seconds that the
              interface is unavailable.  At each layer, the SONET/SDH
              interface is said to be unavailable at the onset of 10
              contiguous SESs.  The 10 SESs are included in unavailable
              time.  Once unavailable, the SONET/SDH interface becomes
              available at the onset of 10 contiguous seconds with no
              SESs.  The 10 seconds with no SESs are excluded from
              unavailable time.  With respect to the SONET/SDH error



AToM MIB Working Group                                         [Page 14]

RFC 1595                   SONET/SDH Objects                  March 1994


              counts at each layer, all counters at that layer are
              incremented while the SONET/SDH interface is deemed
              available at that layer.  While the interface is deemed
              unavailable at that layer, the only count that is
              incremented is UASs at that layer.

              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 SES and UAS
              counters must be adjusted when the Unavailable Signal
              State is entered. Clearly, successive GETs of the
              affected sonetPathIntervalSES and sonetPathIntervalUAS
              (for the Line and VT also) 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.

         Unequipped
              If a Path or VT connection is not provisioned (idle) the
              SONET equipment will signal this state by transmitting
              the Path or VT Signal Label as follows:
              - byte C2 of the STS Path Overhead equal to 0 for an
              unequipped Path,
              - byte V5 of the VT Path Overhead equal to 0 for an
              unequipped VT.

         Signal Label Mismatch
              A Path or VT connection is not correctly provisioned if a
              received Path or VT Signal Label mismatch occurs.  A
              received Signal Label is considered mismatched if it does
              not equal either the locally provisioned value or the
              value 'equipped non-specific' (1 hex). Note that any
              received non-zero Signal Label is considered a locally
              provisioned value of 'equipped non-specific'.  Only in-
              service, provisioned Path Terminating equipment can
              detect mismatched Signal labels. It is considered
              provisioned if it has been configured for a mapping and
              has been assigned signals to and from which the mapping
              takes place.

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






AToM MIB Working Group                                         [Page 15]

RFC 1595                   SONET/SDH Objects                  March 1994


3.6.  Values for x for the Section, Line, Path, and VT Layers

                   Value for x for SONET/SDH Section SES Definition

              Rate            x               Minimum Bit Error Rate
              =======================================================
              OC-1             9                      1.5 x 10^-7
              0C-3            16                        1 x 10^-7
              OC-9            47                        1 x 10^-7
              OC-12           63                        1 x 10^-7
              OC-18           94                        1 x 10^-7
              OC-24          125                        1 x 10^-7
              OC-36          187                        1 x 10^-7
              OC-48          249                        1 x 10^-7


                   Value for x for SONET/SDH Line SES Definition

              Rate            x               Minimum Bit Error Rate
              =======================================================
              OC-1            12                       2 x 10^-7
              0C-3            32                       2 x 10^-7
              OC-9            94                       2 x 10^-7
              OC-12          124                       2 x 10^-7
              OC-18          186                       2 x 10^-7
              OC-24          248                       2 x 10^-7
              OC-36          370                       2 x 10^-7
              OC-48          494                       2 x 10^-7


                   Value for x for SONET/SDH STS-Path SES Definition

              Rate            x               Minimum Bit Error Rate
              =======================================================
              STS-1            9                       1.5 x 10^-7
              STS-3           16                         1 x 10^-7


                   Value for x for SONET/SDH VT-Path SES Definition

              Rate            x               Minimum Bit Error Rate
              =======================================================
              VT1.5            4                       2 x 10^-6
              VT2              6                       2 x 10^-6
              VT3              8                       2 x 10^-6
              VT6             14                       2 x 10^-6





AToM MIB Working Group                                         [Page 16]

RFC 1595                   SONET/SDH Objects                  March 1994


4.  Object Definitions

         SONET-MIB DEFINITIONS ::= BEGIN


         IMPORTS
             MODULE-IDENTITY, OBJECT-TYPE, Counter32, Gauge32,
             Integer32,
                   FROM SNMPv2-SMI
             TEXTUAL-CONVENTION, DisplayString
                   FROM SNMPv2-TC
             MODULE-COMPLIANCE, OBJECT-GROUP
                   FROM SNMPv2-CONF
             ifIndex, transmission
                   FROM RFC-1213;

         --  This is the MIB module for the SMDS Interface objects.


         sonetMIB MODULE-IDENTITY
             LAST-UPDATED "9401030000Z"
             ORGANIZATION "IETF AToM MIB Working Group"
             CONTACT-INFO
               "        Tracy Brown

                Postal: Bell Communications Research
                        331 Newman Springs Road
                        P.O. Box 7020
                        Red Bank, NJ  07701-7020
                        US

                   Tel: +1 908 758 2107
                   Fax: +1 908 758 4177

                E-mail: [email protected]


                        Kaj Tesink

                Postal: Bell Communications Research
                        331 Newman Springs Road
                        P.O. Box 7020
                        Red Bank, NJ  07701-7020
                        US

                   Tel: +1 908 758 5254
                   Fax: +1 908 758 4196




AToM MIB Working Group                                         [Page 17]

RFC 1595                   SONET/SDH Objects                  March 1994


                E-mail: [email protected]"
             DESCRIPTION
                  "The MIB module to describe
                  SONET/SDH interfaces objects."
             ::= { transmission 39 }


         --  This is the MIB module for the SONET/SDH objects

         sonetObjects      OBJECT IDENTIFIER ::= { sonetMIB 1 }

         sonetObjectsPath  OBJECT IDENTIFIER ::= { sonetMIB 2 }

         sonetObjectsVT    OBJECT IDENTIFIER ::= { sonetMIB 3 }


         -- groups in the SONET/SDH MIB module

         sonetMedium       OBJECT IDENTIFIER ::= { sonetObjects 1 }

         sonetSection      OBJECT IDENTIFIER ::= { sonetObjects 2 }

         sonetLine         OBJECT IDENTIFIER ::= { sonetObjects 3 }

         sonetFarEndLine   OBJECT IDENTIFIER ::= { sonetObjects 4 }

         sonetPath         OBJECT IDENTIFIER ::= { sonetObjectsPath 1 }

         sonetFarEndPath   OBJECT IDENTIFIER ::= { sonetObjectsPath 2 }

         sonetVT           OBJECT IDENTIFIER ::= { sonetObjectsVT 1 }

         sonetFarEndVT     OBJECT IDENTIFIER ::= { sonetObjectsVT 2 }


         -- the SONET/SDH Medium group

         -- SONET/SDH interfaces for some applications may be
         -- electrical interfaces and not optical interfaces.
         -- This group handles the configuration information for
         -- both optical SONET/SDH interfaces and electrical
         -- SONET/SDH interfaces.

         sonetMediumTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetMediumEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION



AToM MIB Working Group                                         [Page 18]

RFC 1595                   SONET/SDH Objects                  March 1994


                "The SONET/SDH Medium table."
              ::= { sonetMedium 1 }

         sonetMediumEntry OBJECT-TYPE
             SYNTAX  SonetMediumEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "An entry in the SONET/SDH Medium table."
             INDEX   { ifIndex }
              ::= { sonetMediumTable 1 }

         SonetMediumEntry ::=
             SEQUENCE {
                  sonetMediumType               INTEGER,
                  sonetMediumTimeElapsed        Integer32,
                  sonetMediumValidIntervals     Integer32,
                  sonetMediumLineCoding         INTEGER,
                  sonetMediumLineType           INTEGER,
                  sonetMediumCircuitIdentifier  DisplayString
             }


         sonetMediumType OBJECT-TYPE
             SYNTAX  INTEGER  {
                        sonet(1),
                        sdh(2)
                     }
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "This variable identifies whether a SONET
                or a SDH signal is used across this interface."
             ::= { sonetMediumEntry 1 }

         sonetMediumTimeElapsed OBJECT-TYPE
             SYNTAX  Integer32 (1..900)
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The number of seconds, including partial
                seconds, that have elapsed since the beginning of
                the current error-measurement period."
             ::= { sonetMediumEntry 2 }

         sonetMediumValidIntervals OBJECT-TYPE
             SYNTAX  Integer32 (0..96)
             MAX-ACCESS  read-only



AToM MIB Working Group                                         [Page 19]

RFC 1595                   SONET/SDH Objects                  March 1994


             STATUS  current
             DESCRIPTION
                "The number of previous intervals for which valid
                data has been stored.  A SONET device must support
                at least n intervals.
                The minimum value of n is 4.
                The default of n is 32.
                The maximum value of n is 96.
                The value of this object will be n unless
                the device was brought online within the last
                (nx15) minutes, in which case the value will be the
                number of complete 15 minute intervals the device has
                been online."
             ::= { sonetMediumEntry 3 }

         sonetMediumLineCoding OBJECT-TYPE
             SYNTAX  INTEGER {
                         sonetMediumOther(1),
                         sonetMediumB3ZS(2),
                         sonetMediumCMI(3),
                         sonetMediumNRZ(4),
                         sonetMediumRZ(5)
                     }
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "This variable describes the line coding for
                this interface. The B3ZS and CMI are used for
                electrical SONET/SDH signals (STS-1 and STS-3).
                The Non-Return to Zero (NRZ) and the Return
                to Zero are used for optical SONET/SDH signals."
             ::= { sonetMediumEntry 4 }

         sonetMediumLineType OBJECT-TYPE
             SYNTAX  INTEGER {
                         sonetOther(1),
                         sonetShortSingleMode(2),
                         sonetLongSingleMode(3),
                         sonetMultiMode(4),
                         sonetCoax(5),
                         sonetUTP(6)
                     }
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "This variable describes the line type for
                this interface. The line types are
                Short and Long Range



AToM MIB Working Group                                         [Page 20]

RFC 1595                   SONET/SDH Objects                  March 1994


                Single Mode fiber or Multi-Mode fiber interfaces,
                and coax and UTP for electrical interfaces.  The
                value sonetOther should be used when the Line Type is
                not one of the listed values."
             ::= { sonetMediumEntry 5 }

         sonetMediumCircuitIdentifier OBJECT-TYPE
             SYNTAX  DisplayString (SIZE (0..255))
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "This variable contains the transmission
                vendor's circuit identifier, for the
                purpose of facilitating troubleshooting."
             ::= { sonetMediumEntry 6 }


         -- the SONET/SDH Section group

         -- this group consists of 2 tables:
         -- - the SONET/SDH Section Current Table
         -- - the SONET/SDH Section Interval Table



         -- the SONET/SDH Section Current Table

         -- The SONET/SDH Section
         -- current table contains various statistics
         -- being collected for the current 15 minute interval.

         sonetSectionCurrentTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetSectionCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "The SONET/SDH Section Current table."
              ::= { sonetSection 1 }

         sonetSectionCurrentEntry OBJECT-TYPE
             SYNTAX  SonetSectionCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "An entry in the SONET/SDH Section Current table."
             INDEX   { ifIndex }
              ::= { sonetSectionCurrentTable 1 }




AToM MIB Working Group                                         [Page 21]

RFC 1595                   SONET/SDH Objects                  March 1994


         SonetSectionCurrentEntry ::=
             SEQUENCE {
                 sonetSectionCurrentStatus   Integer32,
                 sonetSectionCurrentESs      Gauge32,
                 sonetSectionCurrentSESs     Gauge32,
                 sonetSectionCurrentSEFSs    Gauge32,
                 sonetSectionCurrentCVs      Gauge32
             }


         sonetSectionCurrentStatus OBJECT-TYPE
             SYNTAX  Integer32 (1..6)
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "This variable indicates the
                status of the interface.
                The sonetSectionCurrentStatus
                is a bit map represented
                as a sum, therefore,
                it can represent multiple defects
                simultaneously.
                The sonetSectionNoDefect should be
                set if and only if
                no other flag is set.

                The various bit positions are:
                      1   sonetSectionNoDefect
                      2   sonetSectionLOS
                      4   sonetSectionLOF"
              ::= { sonetSectionCurrentEntry 1 }

         sonetSectionCurrentESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of Errored
                Seconds encountered by a SONET/SDH
                Section in the current 15 minute interval."
              ::= { sonetSectionCurrentEntry 2 }

         sonetSectionCurrentSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of



AToM MIB Working Group                                         [Page 22]

RFC 1595                   SONET/SDH Objects                  March 1994


                Severely Errored Seconds
                encountered by a SONET/SDH Section in the current 15
                minute interval."
              ::= { sonetSectionCurrentEntry 3 }

         sonetSectionCurrentSEFSs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of
                Severely Errored Framing Seconds
                encountered by a SONET/SDH Section in the current
                15 minute interval."
             ::= { sonetSectionCurrentEntry 4 }

         sonetSectionCurrentCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of Coding
                Violations encountered by a
                SONET/SDH Section in the current 15 minute interval."
              ::= { sonetSectionCurrentEntry 5 }


         -- the SONET/SDH Section Interval Table

         -- The SONET/SDH Section Interval Table
         -- contains various statistics
         -- collected by each system over a maximum
         -- of the previous 24 hours of
         -- operation.  The past 24 hours may be broken into 96
         -- completed 15 minute intervals.
         -- A system is required to store at
         -- least 4 completed 15 minute interval.
         -- The default value is 32 intervals.

         sonetSectionIntervalTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetSectionIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "The SONET/SDH Section Interval table."
              ::= { sonetSection 2 }

         sonetSectionIntervalEntry OBJECT-TYPE



AToM MIB Working Group                                         [Page 23]

RFC 1595                   SONET/SDH Objects                  March 1994


             SYNTAX  SonetSectionIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "An entry in the SONET/SDH Section Interval table."
             INDEX   { ifIndex,
                       sonetSectionIntervalNumber }
              ::= { sonetSectionIntervalTable 1 }

         SonetSectionIntervalEntry ::=
             SEQUENCE {
                  sonetSectionIntervalNumber  Integer32,
                  sonetSectionIntervalESs     Gauge32,
                  sonetSectionIntervalSESs    Gauge32,
                  sonetSectionIntervalSEFSs   Gauge32,
                  sonetSectionIntervalCVs     Gauge32
             }


         sonetSectionIntervalNumber OBJECT-TYPE
             SYNTAX  Integer32 (1..96)
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
               "A number between 1 and 96, which identifies the
               interval for which the set of statistics is available.
               The interval identified by 1 is the most recently
               completed 15 minute interval,
               and the interval identified
               by N is the interval immediately preceding the
               one identified
               by N-1."
              ::= { sonetSectionIntervalEntry 1 }

         sonetSectionIntervalESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of
                Errored Seconds encountered
                by a SONET/SDH Section in a
                particular 15-minute interval
                in the past 24 hours."
              ::= { sonetSectionIntervalEntry 2 }

         sonetSectionIntervalSESs OBJECT-TYPE
             SYNTAX  Gauge32



AToM MIB Working Group                                         [Page 24]

RFC 1595                   SONET/SDH Objects                  March 1994


             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of
                Severely Errored Seconds
                encountered by a SONET/SDH Section in a
                particular 15-minute interval
                in the past 24 hours."
             ::= { sonetSectionIntervalEntry 3 }

         sonetSectionIntervalSEFSs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of
                Severely Errored Framing Seconds
                encountered by a SONET/SDH Section in a
                particular 15-minute interval
                in the past 24 hours."
             ::= { sonetSectionIntervalEntry 4 }

         sonetSectionIntervalCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of Coding
                Violations encountered by a
                SONET/SDH Section in a particular 15-minute interval
                in the past 24 hours."
             ::= { sonetSectionIntervalEntry 5 }


         -- the SONET/SDH Line group

         -- this group consists of 2 tables:
         -- - the SONET/SDH Line Current Table
         -- - the SONET/SDH Line Interval Table


         -- the SONET/SDH Line Current Table

         -- The SONET/SDH Line
         -- current table contains various statistics
         -- being collected for the current 15 minute interval.

         sonetLineCurrentTable OBJECT-TYPE



AToM MIB Working Group                                         [Page 25]

RFC 1595                   SONET/SDH Objects                  March 1994


             SYNTAX  SEQUENCE OF SonetLineCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
               "The SONET/SDH Line Current table."
             ::= { sonetLine 1 }

         sonetLineCurrentEntry OBJECT-TYPE
             SYNTAX  SonetLineCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
               "An entry in the SONET/SDH Line Current table."
             INDEX   { ifIndex }
             ::= { sonetLineCurrentTable 1 }

         SonetLineCurrentEntry ::=
             SEQUENCE {
                  sonetLineCurrentStatus    Integer32,
                  sonetLineCurrentESs       Gauge32,
                  sonetLineCurrentSESs      Gauge32,
                  sonetLineCurrentCVs       Gauge32,
                  sonetLineCurrentUASs      Gauge32
              }


         sonetLineCurrentStatus OBJECT-TYPE
             SYNTAX  Integer32 (1..6)
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "This variable indicates the
                status of the interface.
                The sonetLineCurrentStatus
                is a bit map represented
                as a sum, therefore,
                it can represent multiple defects
                simultaneously.
                The sonetLineNoDefect should be
                set if and only if
                no other flag is set.

                The various bit positions are:
                 1   sonetLineNoDefect
                 2   sonetLineAIS
                 4   sonetLineRDI"
              ::= { sonetLineCurrentEntry 1 }




AToM MIB Working Group                                         [Page 26]

RFC 1595                   SONET/SDH Objects                  March 1994


         sonetLineCurrentESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of Errored
              Seconds encountered by a SONET/SDH
              Line in the current 15 minute interval."
             ::= { sonetLineCurrentEntry 2 }

         sonetLineCurrentSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Severely Errored Seconds
              encountered by a SONET/SDH Line in the current 15
              minute
              interval."
             ::= { sonetLineCurrentEntry 3 }

         sonetLineCurrentCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of Coding
              Violations encountered by a
              SONET/SDH Line in the current 15 minute interval."
             ::= { sonetLineCurrentEntry 4 }

         sonetLineCurrentUASs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Unavailable Seconds
              encountered by a SONET/SDH Line in the current 15
              minute
              interval."
             ::= { sonetLineCurrentEntry 5 }


         -- the SONET/SDH Line Interval Table

         -- The SONET/SDH Line Interval Table



AToM MIB Working Group                                         [Page 27]

RFC 1595                   SONET/SDH Objects                  March 1994


         -- contains various statistics
         -- collected by each system over a maximum
         -- of the previous 24 hours of
         -- operation.  The past 24 hours may be broken into 96
         -- completed 15 minute intervals.
         -- A system is required to store at
         -- least 4 completed 15 minute interval.
         -- The default value is 32 intervals.

         sonetLineIntervalTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetLineIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "The SONET/SDH Line Interval table."
              ::= { sonetLine 2 }

         sonetLineIntervalEntry OBJECT-TYPE
             SYNTAX  SonetLineIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "An entry in the SONET/SDH Line Interval table."
            INDEX   { ifIndex,
                      sonetLineIntervalNumber }
            ::= { sonetLineIntervalTable 1 }

         SonetLineIntervalEntry ::=
             SEQUENCE {
                 sonetLineIntervalNumber    Integer32,
                 sonetLineIntervalESs       Gauge32,
                 sonetLineIntervalSESs      Gauge32,
                 sonetLineIntervalCVs       Gauge32,
                 sonetLineIntervalUASs      Gauge32
             }


         sonetLineIntervalNumber OBJECT-TYPE
             SYNTAX  Integer32 (1..96)
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                 "A number between 1 and 96, which identifies the
                 interval for which the set of statistics is available.
                 The interval identified by 1 is the most recently
                 completed 15 minute interval,
                 and the interval identified
                 by N is the interval immediately preceding the



AToM MIB Working Group                                         [Page 28]

RFC 1595                   SONET/SDH Objects                  March 1994


                 one identified
                 by N-1."
              ::= { sonetLineIntervalEntry 1 }

         sonetLineIntervalESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of
                Errored Seconds encountered
                by a SONET/SDH Line in a
                particular 15-minute interval
                in the past 24 hours."
              ::= { sonetLineIntervalEntry 2 }

         sonetLineIntervalSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                "The counter associated with the number of
                Severely Errored Seconds
                encountered by a SONET/SDH Line in a
                particular 15-minute interval
                in the past 24 hours."
               ::= { sonetLineIntervalEntry 3 }

         sonetLineIntervalCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
               "The counter associated with the number of Coding
               Violations encountered by a
               SONET/SDH Line in a
               particular 15-minute interval
               in the past 24 hours."
             ::= { sonetLineIntervalEntry 4 }

         sonetLineIntervalUASs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
               "The counter associated with the
               number of Unavailable Seconds
               encountered by a SONET/SDH Line in



AToM MIB Working Group                                         [Page 29]

RFC 1595                   SONET/SDH Objects                  March 1994


               a particular 15-minute interval
               in the past 24 hours."
             ::= { sonetLineIntervalEntry 5 }


         -- The SONET/SDH Far End Line group.
         -- This group may only be implemented by SONET/SDH (LTEs)
         -- systems that provide for a far end block error (FEBE)
         -- information at the SONET/SDH Line Layer.

         -- This group consists of two tables:
         --    SONET/SDH Far End Line Current Table
         --    SONET/SDH Far End Line Interval Table



         -- The SONET/SDH Far End Line Current Table

         -- The SONET/SDH Far End Line Current table contains
         -- various statistics being
         -- collected for the current 15 minute interval.
         -- The statistics are collected from the far end
         -- block error code (FEBE)
         -- within the third Z2 byte of the Line Overhead
         -- in Broadband ISDN applications.
         -- The definitions are the same as described for
         -- the near-end information.

         sonetFarEndLineCurrentTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetFarEndLineCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
               "The SONET/SDH Far End Line Current table."
             ::= { sonetFarEndLine 1 }

         sonetFarEndLineCurrentEntry OBJECT-TYPE
             SYNTAX  SonetFarEndLineCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
               "An entry in the SONET/SDH Far End Line Current table."
             INDEX   { ifIndex }
             ::= { sonetFarEndLineCurrentTable 1 }

         SonetFarEndLineCurrentEntry ::=
             SEQUENCE {
                 sonetFarEndLineCurrentESs       Gauge32,



AToM MIB Working Group                                         [Page 30]

RFC 1595                   SONET/SDH Objects                  March 1994


                 sonetFarEndLineCurrentSESs      Gauge32,
                 sonetFarEndLineCurrentCVs       Gauge32,
                 sonetFarEndLineCurrentUASs      Gauge32
                }


         sonetFarEndLineCurrentESs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                "The counter associated with the number of Far
                Far End Errored Seconds encountered by a SONET/SDH
                interface in the current 15 minute interval."
            ::= { sonetFarEndLineCurrentEntry 1 }

         sonetFarEndLineCurrentSESs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                "The counter associated with the number of
                Far End Severely Errored Seconds
                encountered by a SONET/SDH Medium/Section/Line
                interface in the current 15 minute
                interval."
            ::= { sonetFarEndLineCurrentEntry 2 }

         sonetFarEndLineCurrentCVs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                "The counter associated with the number of
                Far End Coding Violations reported via
                the far end block error count
                encountered by a
                SONET/SDH Medium/Section/Line
                interface in the current 15 minute interval."
            ::= { sonetFarEndLineCurrentEntry 3 }

         sonetFarEndLineCurrentUASs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                "The counter associated with the number of
                Far End Unavailable Seconds



AToM MIB Working Group                                         [Page 31]

RFC 1595                   SONET/SDH Objects                  March 1994


                encountered by a
                SONET/SDH Medium/Section/Line
                interface in the current 15 minute interval."
            ::= { sonetFarEndLineCurrentEntry 4 }


         -- The SONET/SDH Far End Line Interval Table

         -- The SONET/SDH Far End Line Interval Table
         -- contains various statistics
         -- collected by each system over a maximum
         -- of the previous 24 hours of
         -- operation.  The past 24 hours may be broken into 96
         -- completed 15 minute intervals.
         -- A system is required to store at
         -- least 4 completed 15 minute interval.
         -- The default value is 32 intervals.

         sonetFarEndLineIntervalTable OBJECT-TYPE
            SYNTAX  SEQUENCE OF SonetFarEndLineIntervalEntry
            MAX-ACCESS  not-accessible
            STATUS  current
            DESCRIPTION
               "The SONET/SDH Far End Line Interval table."
            ::= { sonetFarEndLine 2 }

         sonetFarEndLineIntervalEntry OBJECT-TYPE
            SYNTAX  SonetFarEndLineIntervalEntry
            MAX-ACCESS  not-accessible
            STATUS  current
            DESCRIPTION
              "An entry in the SONET/SDH Far
              End Line Interval table."
            INDEX   { ifIndex,
                      sonetFarEndLineIntervalNumber }
            ::= { sonetFarEndLineIntervalTable 1 }

         SonetFarEndLineIntervalEntry ::=
             SEQUENCE {
                  sonetFarEndLineIntervalNumber    Integer32,
                  sonetFarEndLineIntervalESs       Gauge32,
                  sonetFarEndLineIntervalSESs      Gauge32,
                  sonetFarEndLineIntervalCVs       Gauge32,
                  sonetFarEndLineIntervalUASs      Gauge32
             }


         sonetFarEndLineIntervalNumber OBJECT-TYPE



AToM MIB Working Group                                         [Page 32]

RFC 1595                   SONET/SDH Objects                  March 1994


            SYNTAX  Integer32 (1..96)
            MAX-ACCESS  not-accessible
            STATUS  current
            DESCRIPTION
                  "A number between 1 and 96, which identifies the
                  interval for which the set of statistics is available.
                  The interval identified by 1 is the most recently
                  completed 15 minute interval,
                  and the interval identified
                  by N is the interval immediately preceding the
                  one identified
                  by N-1."
            ::= { sonetFarEndLineIntervalEntry 1 }

         sonetFarEndLineIntervalESs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                 "The counter associated with the number of
                 Far End Errored Seconds encountered
                 by a SONET/SDH Line
                 interface in a particular 15-minute interval
                 in the past 24 hours."
           ::= { sonetFarEndLineIntervalEntry 2 }

         sonetFarEndLineIntervalSESs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                 "The counter associated with the number of
                 Far End Severely Errored Seconds
                 encountered by a SONET/SDH Line
                 interface in a particular 15-minute interval
                 in the past 24 hours."
           ::= { sonetFarEndLineIntervalEntry 3 }

         sonetFarEndLineIntervalCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Coding Violations reported via
                  the far end block error count
                  encountered by a
                  SONET/SDH Line



AToM MIB Working Group                                         [Page 33]

RFC 1595                   SONET/SDH Objects                  March 1994


                  interface in a particular 15-minute interval
                  in the past 24 hours."
             ::= { sonetFarEndLineIntervalEntry 4 }

         sonetFarEndLineIntervalUASs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                "The counter associated with the number of
                Far End Unavailable Seconds
                encountered by a
                SONET/SDH Line
                interface in a particular 15-minute interval
                in the past 24 hours."
            ::= { sonetFarEndLineIntervalEntry 5 }


         -- the SONET/SDH Path group

         -- this group consists of 2 tables:
         -- - the SONET/SDH Path Current Table
         -- - the SONET/SDH Path Interval Table


         -- the SONET/SDH Path Current Table

         -- The SONET/SDH Path
         -- current table contains various statistics
         -- being collected for the current 15 minute interval.

         sonetPathCurrentTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetPathCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
              "The SONET/SDH Path Current table."
         ::= { sonetPath 1 }

         sonetPathCurrentEntry OBJECT-TYPE
             SYNTAX  SonetPathCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
              "An entry in the SONET/SDH Path Current table."
             INDEX   { ifIndex }
         ::= { sonetPathCurrentTable 1 }




AToM MIB Working Group                                         [Page 34]

RFC 1595                   SONET/SDH Objects                  March 1994


         SonetPathCurrentEntry ::=
             SEQUENCE {
                 sonetPathCurrentWidth      INTEGER,
                 sonetPathCurrentStatus     Integer32,
                 sonetPathCurrentESs        Gauge32,
                 sonetPathCurrentSESs       Gauge32,
                 sonetPathCurrentCVs        Gauge32,
                 sonetPathCurrentUASs       Gauge32
             }


         sonetPathCurrentWidth OBJECT-TYPE
             SYNTAX  INTEGER  {
                     sts1(1),
                     sts3cSTM1(2),
                     sts12cSTM4(3),
                     sts24c(4),
                     sts48cSTM16(5)
              }
             MAX-ACCESS  read-write
             STATUS  current
             DESCRIPTION
              "A value that indicates the type of the SONET/SDH
              Path.  For SONET, the assigned types are
              the STS-Nc SPEs, where N = 1, 3, 12, 24, and 48.
              STS-1 is equal to 51.84 Mbps.  For SDH, the assigned
              types are the STM-Nc VCs, where N = 1, 4, and 16."
         ::= { sonetPathCurrentEntry 1 }

         sonetPathCurrentStatus OBJECT-TYPE
             SYNTAX  Integer32 (1..14)
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
               "This variable indicates the
               status of the interface.
               The sonetPathCurrentStatus
               is a bit map represented
               as a sum, therefore,
               it can represent multiple defects
               simultaneously.
               The sonetPathNoDefect should be
               set if and only if
               no other flag is set.

               The various bit positions are:
                  1   sonetPathNoDefect
                  2   sonetPathSTSLOP



AToM MIB Working Group                                         [Page 35]

RFC 1595                   SONET/SDH Objects                  March 1994


                  4   sonetPathSTSAIS
                  8   sonetPathSTSRDI
                 16   sonetPathUnequipped
                 32   sonetPathSignalLabelMismatch"
         ::= { sonetPathCurrentEntry 2 }

         sonetPathCurrentESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of Errored
              Seconds encountered by a SONET/SDH
              Path in the current 15 minute interval."
         ::= { sonetPathCurrentEntry 3 }

         sonetPathCurrentSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Severely Errored Seconds
              encountered by a SONET/SDH Path in the current 15
              minute
              interval."
         ::= { sonetPathCurrentEntry 4 }

         sonetPathCurrentCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of Coding
              Violations encountered by a
              SONET/SDH Path in the current 15 minute interval."
         ::= { sonetPathCurrentEntry 5 }

         sonetPathCurrentUASs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Unavailable Seconds
              encountered by a Path in the current
              15 minute, interval."
         ::= { sonetPathCurrentEntry 6 }



AToM MIB Working Group                                         [Page 36]

RFC 1595                   SONET/SDH Objects                  March 1994


         -- the SONET/SDH Path Interval Table

         -- The SONET/SDH Path Interval Table
         -- contains various statistics
         -- collected by each system over a maximum
         -- of the previous 24 hours of
         -- operation.  The past 24 hours may be broken into 96
         -- completed 15 minute intervals.
         -- A system is required to store at
         -- least 4 completed 15 minute interval.
         -- The default value is 32 intervals.

         sonetPathIntervalTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetPathIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
              "The SONET/SDH Path Interval table."
         ::= { sonetPath 2 }

         sonetPathIntervalEntry OBJECT-TYPE
             SYNTAX  SonetPathIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
              "An entry in the SONET/SDH Path Interval table."
             INDEX   { ifIndex,
                       sonetPathIntervalNumber }
         ::= { sonetPathIntervalTable 1 }


         SonetPathIntervalEntry ::=
             SEQUENCE {
                  sonetPathIntervalNumber     Integer32,
                  sonetPathIntervalESs        Gauge32,
                  sonetPathIntervalSESs       Gauge32,
                  sonetPathIntervalCVs        Gauge32,
                  sonetPathIntervalUASs       Gauge32
             }


         sonetPathIntervalNumber OBJECT-TYPE
             SYNTAX  Integer32 (1..96)
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "A number between 1 and 96, which identifies the
                interval for which the set of statistics is available.



AToM MIB Working Group                                         [Page 37]

RFC 1595                   SONET/SDH Objects                  March 1994


                The interval identified by 1 is the most recently
                completed 15 minute interval,
                and the interval identified
                by N is the interval immediately preceding the
                one identified
                by N-1."
         ::= { sonetPathIntervalEntry 1 }

         sonetPathIntervalESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Errored Seconds encountered
              by a SONET/SDH Path in a
              particular 15-minute interval
              in the past 24 hours."
         ::= { sonetPathIntervalEntry 2 }

         sonetPathIntervalSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Severely Errored Seconds
              encountered by a SONET/SDH Path in
              a particular 15-minute interval
              in the past 24 hours."
         ::= { sonetPathIntervalEntry 3 }

         sonetPathIntervalCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of Coding
              Violations encountered by a
              SONET/SDH Path in a particular 15-minute interval
              in the past 24 hours."
         ::= { sonetPathIntervalEntry 4 }

         sonetPathIntervalUASs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION



AToM MIB Working Group                                         [Page 38]

RFC 1595                   SONET/SDH Objects                  March 1994


              "The counter associated with the number of
              Unavailable Seconds
              encountered by a Path in a
              particular 15-minute interval
              in the past 24 hours."
         ::= { sonetPathIntervalEntry 5 }


         -- The SONET/SDH Far End Path group

         -- This group consists of two tables:
         --  - SONET/SDH Far End Path Current Table
         --  - SONET/SDH Far End Path Interval Table

         -- The SONET/SDH Far End Path Current Table

         -- The SONET/SDH Far End Path Current table
         -- contains various statistics
         -- being collected for the current 15 minute interval.
         -- The statistics are collected from
         -- the far end block error code
         -- (FEBE) within the G1 byte of the Path Overhead.
         -- The definitions are the same as described for
         -- the near-end information.

         sonetFarEndPathCurrentTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetFarEndPathCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                  "The SONET/SDH Far End Path Current table."
             ::= { sonetFarEndPath 1 }

         sonetFarEndPathCurrentEntry OBJECT-TYPE
             SYNTAX  SonetFarEndPathCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                  "An entry in the SONET/SDH Far End Path Current table."
             INDEX   { ifIndex }
             ::= { sonetFarEndPathCurrentTable 1 }

         SonetFarEndPathCurrentEntry ::=
             SEQUENCE {
                 sonetFarEndPathCurrentESs       Gauge32,
                 sonetFarEndPathCurrentSESs      Gauge32,
                 sonetFarEndPathCurrentCVs       Gauge32,
                 sonetFarEndPathCurrentUASs      Gauge32



AToM MIB Working Group                                         [Page 39]

RFC 1595                   SONET/SDH Objects                  March 1994


             }


         sonetFarEndPathCurrentESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of Far
                  Far End Errored Seconds encountered by a SONET/SDH
                  interface in the current 15 minute interval."
             ::= { sonetFarEndPathCurrentEntry 1 }

         sonetFarEndPathCurrentSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Severely Errored Seconds
                  encountered by a SONET/SDH Path
                  interface in the current 15 minute
                  interval."
             ::= { sonetFarEndPathCurrentEntry 2 }

         sonetFarEndPathCurrentCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Coding Violations reported via
                  the far end block error count
                  encountered by a
                  SONET/SDH Path interface in
                  the current 15 minute interval."
             ::= { sonetFarEndPathCurrentEntry 3 }

         sonetFarEndPathCurrentUASs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                "The counter associated with the number of
                Far End Unavailable Seconds
                encountered by a
                SONET/SDH Path interface in
                the current 15 minute interval."



AToM MIB Working Group                                         [Page 40]

RFC 1595                   SONET/SDH Objects                  March 1994


            ::= { sonetFarEndPathCurrentEntry 4 }


         -- The SONET/SDH Far End Path Interval Table

         -- The SONET/SDH Far End Path Interval Table
         -- contains various statistics
         -- collected by each system over a maximum
         -- of the previous 24 hours of
         -- operation.  The past 24 hours may be broken into 96
         -- completed 15 minute intervals.
         -- A system is required to store at
         -- least 4 completed 15 minute interval.
         -- The default value is 32 intervals.

         sonetFarEndPathIntervalTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetFarEndPathIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                 "The SONET/SDH Far End Path Interval table."
             ::= { sonetFarEndPath 2 }

         sonetFarEndPathIntervalEntry OBJECT-TYPE
             SYNTAX  SonetFarEndPathIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "An entry in the SONET/SDH Far
                End Path Interval table."
             INDEX   { ifIndex,
                       sonetFarEndPathIntervalNumber }
             ::= { sonetFarEndPathIntervalTable 1 }

         SonetFarEndPathIntervalEntry ::=
             SEQUENCE {
                  sonetFarEndPathIntervalNumber     Integer32,
                  sonetFarEndPathIntervalESs        Gauge32,
                  sonetFarEndPathIntervalSESs       Gauge32,
                  sonetFarEndPathIntervalCVs        Gauge32,
                  sonetFarEndPathIntervalUASs       Gauge32
             }


         sonetFarEndPathIntervalNumber OBJECT-TYPE
            SYNTAX  Integer32 (1..96)
            MAX-ACCESS  not-accessible
            STATUS  current



AToM MIB Working Group                                         [Page 41]

RFC 1595                   SONET/SDH Objects                  March 1994


            DESCRIPTION
                 "A number between 1 and 96, which identifies the
                 interval for which the set of statistics is available.
                 The interval identified by 1 is the most recently
                 completed 15 minute interval,
                 and the interval identified
                 by N is the interval immediately preceding the
                 one identified
                 by N-1."
            ::= { sonetFarEndPathIntervalEntry 1 }

         sonetFarEndPathIntervalESs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                 "The counter associated with the number of
                 Far End Errored Seconds encountered
                 by a SONET/SDH Path interface in a
                 particular 15-minute interval
                 in the past 24 hours."
            ::= { sonetFarEndPathIntervalEntry 2 }

         sonetFarEndPathIntervalSESs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                 "The counter associated with the number of
                 Far End Severely Errored Seconds
                 encountered by a SONET/SDH Path interface
                 in a particular 15-minute interval
                 in the past 24 hours."
            ::= { sonetFarEndPathIntervalEntry 3 }

         sonetFarEndPathIntervalCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Coding Violations reported via
                  the far end block error count
                  encountered by a
                  SONET/SDH Path interface
                  in a particular 15-minute interval
                  in the past 24 hours."
             ::= { sonetFarEndPathIntervalEntry 4 }



AToM MIB Working Group                                         [Page 42]

RFC 1595                   SONET/SDH Objects                  March 1994


         sonetFarEndPathIntervalUASs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                "The counter associated with the number of
                Far End Unavailable Seconds
                encountered by a
                SONET/SDH Path interface in
                a particular 15-minute interval
                in the past 24 hours."
            ::= { sonetFarEndPathIntervalEntry 5 }


         -- the SONET/SDH Virtual Tributary group

         -- this group consists of 2 tables:
         -- - the SONET/SDH VT Current Table
         -- - the SONET/SDH VT Interval Table

         -- For SDH signals, virtual tributaries are
         -- called VCs instead of VTs

         -- A VT1.5 = VC11
         -- A VT2 = VC12
         -- A VT3 = none
         -- A VT6 = VC3


         -- the SONET/SDH VT Current Table

         -- The SONET/SDH VT current table
         -- contains various statistics
         -- being collected for the
         -- current 15 minute interval.

         sonetVTCurrentTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetVTCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
              "The SONET/SDH VT Current table."
         ::= { sonetVT 1 }

         sonetVTCurrentEntry OBJECT-TYPE
             SYNTAX  SonetVTCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current



AToM MIB Working Group                                         [Page 43]

RFC 1595                   SONET/SDH Objects                  March 1994


             DESCRIPTION
              "An entry in the SONET/SDH VT Current table."
             INDEX   { ifIndex }
         ::= { sonetVTCurrentTable 1 }

         SonetVTCurrentEntry ::=
             SEQUENCE {
                 sonetVTCurrentWidth      INTEGER,
                 sonetVTCurrentStatus     Integer32,
                 sonetVTCurrentESs        Gauge32,
                 sonetVTCurrentSESs       Gauge32,
                 sonetVTCurrentCVs        Gauge32,
                 sonetVTCurrentUASs       Gauge32
             }


         sonetVTCurrentWidth OBJECT-TYPE
             SYNTAX  INTEGER {
                     vtWidth15VC11(1),
                     vtWidth2VC12(2),
                     vtWidth3(3),
                     vtWidth6VC2(4),
                     vtWidth6c(5)
                  }
             MAX-ACCESS  read-write
             STATUS  current
             DESCRIPTION
             "A value that indicates the type of the SONET
              VT and SDH VC.  Assigned widths are
              VT1.5/VC11, VT2/VC12, VT3, VT6/VC2, and VT6c."
         ::= { sonetVTCurrentEntry 1 }

         sonetVTCurrentStatus OBJECT-TYPE
             SYNTAX  Integer32 (1..30)
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
               "This variable indicates the
               status of the interface.
               The sonetVTCurrentStatus
               is a bit map represented
               as a sum, therefore,
               it can represent multiple defects
               and failures
               simultaneously.
               The sonetVTNoDefect should be
               set if and only if
               no other flag is set.



AToM MIB Working Group                                         [Page 44]

RFC 1595                   SONET/SDH Objects                  March 1994


               The various bit positions are:
                  1   sonetVTNoDefect
                  2   sonetVTLOP
                  4   sonetVTPathAIS
                  8   sonetVTPathRDI
                 16   sonetVTPathRFI
                 32   sonetVTUnequipped
                 64   sonetVTSignalLabelMismatch"
         ::= { sonetVTCurrentEntry 2 }

         sonetVTCurrentESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of Errored
              Seconds encountered by a SONET/SDH
              VT in the current 15 minute interval."
         ::= { sonetVTCurrentEntry 3 }

         sonetVTCurrentSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Severely Errored Seconds
              encountered by a SONET/SDH VT in the current 15 minute
              interval."
         ::= { sonetVTCurrentEntry 4 }

         sonetVTCurrentCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of Coding
              Violations encountered by a
              SONET/SDH VT in the current 15 minute interval."
         ::= { sonetVTCurrentEntry 5 }

         sonetVTCurrentUASs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Unavailable Seconds



AToM MIB Working Group                                         [Page 45]

RFC 1595                   SONET/SDH Objects                  March 1994


              encountered by a VT in the current
              15 minute, interval."
         ::= { sonetVTCurrentEntry 6 }


         -- the SONET/SDH VT Interval Table

         -- The SONET/SDH VT Interval Table
         -- contains various statistics
         -- collected by each system over a maximum
         -- of the previous 24 hours of
         -- operation.  The past 24 hours may be broken into 96
         -- completed 15 minute intervals.
         -- A system is required to store at
         -- least 4 completed 15 minute interval.
         -- The default value is 32 intervals.

         sonetVTIntervalTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetVTIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
              "The SONET/SDH VT Interval table."
         ::= { sonetVT 2 }

         sonetVTIntervalEntry OBJECT-TYPE
             SYNTAX  SonetVTIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
              "An entry in the SONET/SDH VT Interval table."
             INDEX   { ifIndex,
                       sonetVTIntervalNumber }
         ::= { sonetVTIntervalTable 1 }

         SonetVTIntervalEntry ::=
             SEQUENCE {
                 sonetVTIntervalNumber     Integer32,
                 sonetVTIntervalESs        Gauge32,
                 sonetVTIntervalSESs       Gauge32,
                 sonetVTIntervalCVs        Gauge32,
                 sonetVTIntervalUASs       Gauge32
             }


         sonetVTIntervalNumber OBJECT-TYPE
             SYNTAX  Integer32 (1..96)
             MAX-ACCESS  not-accessible



AToM MIB Working Group                                         [Page 46]

RFC 1595                   SONET/SDH Objects                  March 1994


             STATUS  current
             DESCRIPTION
               "A number between 1 and 96, which identifies the
               interval for which the set of statistics is available.
               The interval identified by 1 is the most recently
               completed 15 minute interval,
               and the interval identified
               by N is the interval immediately preceding the
               one identified
               by N-1."
         ::= { sonetVTIntervalEntry 1 }

         sonetVTIntervalESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Errored Seconds encountered
              by a SONET/SDH VT in a particular 15-minute interval
              in the past 24 hours."
         ::= { sonetVTIntervalEntry 2 }

         sonetVTIntervalSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Severely Errored Seconds
              encountered by a SONET/SDH VT
              in a particular 15-minute interval
              in the past 24 hours."
         ::= { sonetVTIntervalEntry 3 }

         sonetVTIntervalCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of Coding
              Violations encountered by a
              SONET/SDH VT in a particular 15-minute interval
              in the past 24 hours."
         ::= { sonetVTIntervalEntry 4 }

         sonetVTIntervalUASs OBJECT-TYPE
             SYNTAX  Gauge32



AToM MIB Working Group                                         [Page 47]

RFC 1595                   SONET/SDH Objects                  March 1994


             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
              "The counter associated with the number of
              Unavailable Seconds
              encountered by a VT in a particular 15-minute interval
              in the past 24 hours."
         ::= { sonetVTIntervalEntry 5 }


         -- The SONET/SDH Far End VT group

         -- This group consists of two tables:
         --    SONET/SDH Far End VT Current Table
         --    SONET/SDH Far End VT Interval Table


         -- The SONET/SDH Far End VT Current

         -- The SONET/SDH Far End VT Current table
         -- contains various statistics
         -- being collected for the current 15 minute interval.
         -- The statistics are collected from
         -- the far end block error code
         -- (FEBE) within the G1 byte of the VT Overhead.
         -- The definitions are the same as described for
         -- the near-end information.

         sonetFarEndVTCurrentTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetFarEndVTCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                 "The SONET/SDH Far End VT Current table."
             ::= { sonetFarEndVT 1 }

         sonetFarEndVTCurrentEntry OBJECT-TYPE
             SYNTAX  SonetFarEndVTCurrentEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                 "An entry in the SONET/SDH Far End VT Current table."
             INDEX   { ifIndex }
             ::= { sonetFarEndVTCurrentTable 1 }

         SonetFarEndVTCurrentEntry ::=
             SEQUENCE {
                 sonetFarEndVTCurrentESs       Gauge32,



AToM MIB Working Group                                         [Page 48]

RFC 1595                   SONET/SDH Objects                  March 1994


                 sonetFarEndVTCurrentSESs      Gauge32,
                 sonetFarEndVTCurrentCVs       Gauge32,
                 sonetFarEndVTCurrentUASs      Gauge32
             }


         sonetFarEndVTCurrentESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of Far
                 Far End Errored Seconds encountered by a SONET/SDH
                 interface in the current 15 minute interval."
         ::= { sonetFarEndVTCurrentEntry 1 }

         sonetFarEndVTCurrentSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Severely Errored Seconds
                 encountered by a SONET/SDH VT interface
                 in the current 15 minute
                 interval."
             ::= { sonetFarEndVTCurrentEntry 2 }

         sonetFarEndVTCurrentCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                 "The counter associated with the number of
                 Far End Coding Violations reported via
                 the far end block error count
                 encountered by a
                 SONET/SDH VT interface
                 in the current 15 minute interval."
             ::= { sonetFarEndVTCurrentEntry 3 }

         sonetFarEndVTCurrentUASs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
               "The counter associated with the number of
               Far End Unavailable Seconds



AToM MIB Working Group                                         [Page 49]

RFC 1595                   SONET/SDH Objects                  March 1994


               encountered by a
               SONET/SDH VT interface
               in the current 15 minute interval."
            ::= { sonetFarEndVTCurrentEntry 4 }


         -- The SONET/SDH Far End VT Interval Table

         -- The SONET/SDH Far End VT Interval Table
         -- contains various statistics
         -- collected by each system over a maximum
         -- of the previous 24 hours of
         -- operation.  The past 24 hours may be broken into 96
         -- completed 15 minute intervals.
         -- A system is required to store at
         -- least 4 completed 15 minute interval.
         -- The default value is 32 intervals.

         sonetFarEndVTIntervalTable OBJECT-TYPE
             SYNTAX  SEQUENCE OF SonetFarEndVTIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "The SONET/SDH Far End VT Interval table."
             ::= { sonetFarEndVT 2 }

         sonetFarEndVTIntervalEntry OBJECT-TYPE
             SYNTAX  SonetFarEndVTIntervalEntry
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
               "An entry in the SONET/SDH Far
               End VT Interval table."
             INDEX   { ifIndex,
                       sonetFarEndVTIntervalNumber }
             ::= { sonetFarEndVTIntervalTable 1 }

         SonetFarEndVTIntervalEntry ::=
            SEQUENCE {
                  sonetFarEndVTIntervalNumber     Integer32,
                  sonetFarEndVTIntervalESs        Gauge32,
                  sonetFarEndVTIntervalSESs       Gauge32,
                  sonetFarEndVTIntervalCVs        Gauge32,
                  sonetFarEndVTIntervalUASs       Gauge32
             }


         sonetFarEndVTIntervalNumber OBJECT-TYPE



AToM MIB Working Group                                         [Page 50]

RFC 1595                   SONET/SDH Objects                  March 1994


             SYNTAX  Integer32 (1..96)
             MAX-ACCESS  not-accessible
             STATUS  current
             DESCRIPTION
                "A number between 1 and 96, which identifies the
                interval for which the set of statistics is available.
                The interval identified by 1 is the most recently
                completed 15 minute interval,
                and the interval identified
                by N is the interval immediately preceding the
                one identified
                by N-1."
             ::= { sonetFarEndVTIntervalEntry 1 }

         sonetFarEndVTIntervalESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                   "The counter associated with the number of
                   Far End Errored Seconds encountered
                   by a SONET/SDH VT interface
                   in a particular 15-minute interval
                   in the past 24 hours."
            ::= { sonetFarEndVTIntervalEntry 2 }

         sonetFarEndVTIntervalSESs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                   "The counter associated with the number of
                   Far End Severely Errored Seconds
                   encountered by a SONET/SDH VT interface
                   in a particular 15-minute interval
                   in the past 24 hours."
             ::= { sonetFarEndVTIntervalEntry 3 }

         sonetFarEndVTIntervalCVs OBJECT-TYPE
             SYNTAX  Gauge32
             MAX-ACCESS  read-only
             STATUS  current
             DESCRIPTION
                  "The counter associated with the number of
                  Far End Coding Violations reported via
                  the far end block error count
                  encountered by a
                  SONET/SDH VT interface in a



AToM MIB Working Group                                         [Page 51]

RFC 1595                   SONET/SDH Objects                  March 1994


                  particular 15-minute interval
                  in the past 24 hours."
             ::= { sonetFarEndVTIntervalEntry 4 }

         sonetFarEndVTIntervalUASs OBJECT-TYPE
            SYNTAX  Gauge32
            MAX-ACCESS  read-only
            STATUS  current
            DESCRIPTION
                "The counter associated with the number of
                Far End Unavailable Seconds
                encountered by a
                SONET/SDH VT interface in a
                particular 15-minute interval
                in the past 24 hours."
            ::= { sonetFarEndVTIntervalEntry 5 }


         -- conformance information

         sonetConformance OBJECT IDENTIFIER ::= { sonetMIB 4 }

         sonetGroups      OBJECT IDENTIFIER ::= { sonetConformance 1 }
         sonetCompliances OBJECT IDENTIFIER ::= { sonetConformance 2 }


         -- compliance statements

         sonetCompliance MODULE-COMPLIANCE
             STATUS  current
             DESCRIPTION
                     "The compliance statement for SONET/SDH
                      interfaces."

             MODULE  -- this module
                 MANDATORY-GROUPS { sonetMediumStuff, sonetSectionStuff }

                 GROUP       sonetLineStuff
                 DESCRIPTION
                     "Implementation of this group is mandatory for all
                      SONET/SDH systems that terminate SONET/SDH Lines,
                      Paths or Virtual Tributaries."

                 GROUP       sonetFarEndLineStuff
                 DESCRIPTION
                     "Implementation of this group is optional for all
                      SONET/SDH systems that terminate SONET/SDH Lines,
                      Paths or Virtual Tributaries, and that



AToM MIB Working Group                                         [Page 52]

RFC 1595                   SONET/SDH Objects                  March 1994


                      provide for a far end block error (FEBE)
                      information at the SONET/SDH Line Layer."

                 GROUP       sonetPathStuff
                 DESCRIPTION
                     "Implementation of this group is mandatory for all
                      SONET/SDH systems that terminate SONET/SDH
                      Paths or Virtual
                      Tributaries."

                 OBJECT      sonetPathWidth
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Write access is not required."

                 GROUP       sonetFarEndPathStuff
                 DESCRIPTION
                     "Implementation of this group is optional for all
                      SONET/SDH systems that terminate SONET/SDH
                      Paths or Virtual
                      Tributaries, and that process
                      Far End information."

                 GROUP       sonetVTStuff
                 DESCRIPTION
                     "Implementation of this group is mandatory for all
                      SONET/SDH systems that terminate SONET/SDH
                      Virtual Tributaries."

                 OBJECT      sonetVTWidth
                 MIN-ACCESS  read-only
                 DESCRIPTION
                     "Write access is not required."

                 GROUP       sonetFarEndVTStuff
                 DESCRIPTION
                     "Implementation of this group is optional for
                      all SONET/SDH systems that terminate the
                      SONET/SDH floating Virtual Tributaries, and
                      that process Far End information."

             ::= { sonetCompliances 1 }

         -- units of conformance

         sonetMediumStuff    OBJECT-GROUP
             OBJECTS { sonetMediumType,
                       sonetMediumTimeElapsed,



AToM MIB Working Group                                         [Page 53]

RFC 1595                   SONET/SDH Objects                  March 1994


                       sonetMediumValidIntervals,
                       sonetMediumLineCoding,
                       sonetMediumLineType,
                       sonetMediumCircuitIdentifier }
             STATUS  current
             DESCRIPTION
                     "A collection of objects providing configuration
                     information applicable to all SONET/SDH
                     interfaces."
             ::= { sonetGroups 1 }

         sonetSectionStuff    OBJECT-GROUP
             OBJECTS { sonetSectionCurrentStatus,
                       sonetSectionCurrentESs,
                       sonetSectionCurrentSESs,
                       sonetSectionCurrentSEFSs,
                       sonetSectionCurrentCVs,
                       sonetSectionIntervalESs,
                       sonetSectionIntervalSESs,
                       sonetSectionIntervalSEFSs,
                       sonetSectionIntervalCVs
          }
             STATUS  current
             DESCRIPTION
                     "A collection of objects providing information
                     specific to SONET/SDH Section interfaces."
             ::= { sonetGroups 2 }

         sonetLineStuff    OBJECT-GROUP
             OBJECTS { sonetLineCurrentStatus,
                       sonetLineCurrentESs,
                       sonetLineCurrentSESs,
                       sonetLineCurrentCVs,
                       sonetLineCurrentUASs,
                       sonetLineIntervalESs,
                       sonetLineIntervalSESs,
                       sonetLineIntervalCVs,
                       sonetLineIntervalUASs }
             STATUS  current
             DESCRIPTION
                     "A collection of objects providing information
                     specific to SONET/SDH Line interfaces."
             ::= { sonetGroups 3 }

         sonetFarEndLineStuff    OBJECT-GROUP
             OBJECTS { sonetFarEndLineCurrentESs,
                       sonetFarEndLineCurrentSESs,
                       sonetFarEndLineCurrentCVs,



AToM MIB Working Group                                         [Page 54]

RFC 1595                   SONET/SDH Objects                  March 1994


                       sonetFarEndLineCurrentUASs,
                       sonetFarEndLineIntervalESs,
                       sonetFarEndLineIntervalSESs,
                       sonetFarEndLineIntervalCVs,
                       sonetFarEndLineIntervalUASs }
             STATUS  current
             DESCRIPTION
                     "A collection of objects providing information
                     specific to SONET/SDH Line interfaces,
                     and maintaining Line Far End information."
             ::= { sonetGroups 4 }

         sonetPathStuff    OBJECT-GROUP
             OBJECTS { sonetPathCurrentWidth,
                       sonetPathCurrentStatus,
                       sonetPathCurrentESs,
                       sonetPathCurrentSESs,
                       sonetPathCurrentCVs,
                       sonetPathCurrentUASs,
                       sonetPathIntervalESs,
                       sonetPathIntervalSESs,
                       sonetPathIntervalCVs,
                       sonetPathIntervalUASs }
             STATUS  current
             DESCRIPTION
                     "A collection of objects providing information
                     specific to SONET/SDH Path interfaces."
             ::= { sonetGroups 5 }

         sonetFarEndPathStuff    OBJECT-GROUP
             OBJECTS { sonetFarEndPathCurrentESs,
                       sonetFarEndPathCurrentSESs,
                       sonetFarEndPathCurrentCVs,
                       sonetFarEndPathCurrentUASs,
                       sonetFarEndPathIntervalESs,
                       sonetFarEndPathIntervalSESs,
                       sonetFarEndPathIntervalCVs,
                       sonetFarEndPathIntervalUASs }
             STATUS  current
             DESCRIPTION
                     "A collection of objects providing information
                     specific to SONET/SDH Path interfaces,
                     and maintaining Path Far End information."
             ::= { sonetGroups 6 }

         sonetVTStuff    OBJECT-GROUP
             OBJECTS { sonetVTCurrentWidth,
                       sonetVTCurrentStatus,



AToM MIB Working Group                                         [Page 55]

RFC 1595                   SONET/SDH Objects                  March 1994


                       sonetVTCurrentESs,
                       sonetVTCurrentSESs,
                       sonetVTCurrentCVs,
                       sonetVTCurrentUASs,
                       sonetVTIntervalESs,
                       sonetVTIntervalSESs,
                       sonetVTIntervalCVs,
                       sonetVTIntervalUASs }
             STATUS  current
             DESCRIPTION
                     "A collection of objects providing information
                     specific to SONET/SDH VT interfaces."
             ::= { sonetGroups 7 }

         sonetFarEndVTStuff    OBJECT-GROUP
             OBJECTS { sonetFarEndVTCurrentESs,
                       sonetFarEndVTCurrentSESs,
                       sonetFarEndVTCurrentCVs,
                       sonetFarEndVTCurrentUASs,
                       sonetFarEndVTIntervalESs,
                       sonetFarEndVTIntervalSESs,
                       sonetFarEndVTIntervalCVs,
                       sonetFarEndVTIntervalUASs }
             STATUS  current
             DESCRIPTION
                     "A collection of objects providing information
                     specific to SONET/SDH VT interfaces,
                     and maintaining VT Far End information."
             ::= { sonetGroups 8 }



         END

5.  Acknowledgments

  This specification is a product of the AToM MIB Working Group.














AToM MIB Working Group                                         [Page 56]

RFC 1595                   SONET/SDH Objects                  March 1994


6.  References

  [1] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Structure
      of Management Information for version 2 of the Simple Network
      Management Protocol (SNMPv2)", RFC 1442, SNMP Research, Inc.,
      Hughes LAN Systems, Dover Beach Consulting, Inc., Carnegie Mellon
      University, April 1993.

  [2] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Textual
      Conventions for version 2 of the the Simple Network Management
      Protocol (SNMPv2)", RFC 1443, SNMP Research, Inc., Hughes LAN
      Systems, Dover Beach Consulting, Inc., Carnegie Mellon
      University, April 1993.

  [3] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser,
      "Conformance Statements for version 2 of the the Simple Network
      Management Protocol (SNMPv2)", RFC 1444, SNMP Research, Inc.,
      Hughes LAN Systems, Dover Beach Consulting, Inc., Carnegie Mellon
      University, April 1993.

  [4] Galvin, J., and K. McCloghrie, "Administrative Model for version
      2 of the Simple Network Management Protocol (SNMPv2)", RFC 1445,
      Trusted Information Systems, Hughes LAN Systems, April 1993.

  [5] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol
      Operations for version 2 of the Simple Network Management
      Protocol (SNMPv2)", RFC 1448, SNMP Research, Inc., Hughes LAN
      Systems, Dover Beach Consulting, Inc., Carnegie Mellon
      University, April 1993.

  [6] McCloghrie, K., and M. Rose, "Management Information Base for
      Network Management of TCP/IP-based internets: MIB-II", STD 17,
      RFC 1213, Hughes LAN Systems, Inc., 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 - Optical Interface Rates and Formats Specification,
      ANSI T1.105-1988.



AToM MIB Working Group                                         [Page 57]

RFC 1595                   SONET/SDH Objects                  March 1994


 [9a] ANSI T1.105-1991.

 [10] American National Standard for Telecommunications - Digital
      Hierarchy - Optical Interface Specification (Single-Mode), ANSI
      T1.106-1988.

 [11] American National Standard for Telecommunications -- Layer 1 In-
      Service Digital Transmission Performance Monitoring T1M1.3/93-
      005R2, July 1993.

 [12] McCloghrie, K.,  and F. Kastenholz, "Evolution of Interfaces
      Group of MIB-II", RFC 1573, Hughes LAN Systems, FTP Software,
      January 1994.

 [13] Cox, T., and K. Tesink, Editors, "Definitions of Managed Objects
      for the DS3/E3 Interface Type", RFC 1407, Bellcore, January 1993.

 [14] Baker, F.,  and J. Watt, Editors, "Definitions of Managed Objects
      for the DS1/E1 Interface Type", RFC 1406, Advanced Computer
      Communications, Newbridge Networks Corporation, January 1993.

 [15] CCITT Recommendation G.707, "Synchronous Digital Hierarchy Bit
      Rates", June 1992.

 [16] CCITT Recommendation G.708, "Network Node Interface for the
      Synchronous Digital Hierarchy", June 1992.

 [17] CCITT Recommendation G.709, "Synchronous Multiplexing Structure",
      June 1992.

 [18] CCITT Recommendation G.783, "Characteristics of Synchronous
      Digital Hierarchy (SDH) Multiplexing Equipment Functional
      Blocks", November 1992.


















AToM MIB Working Group                                         [Page 58]

RFC 1595                   SONET/SDH Objects                  March 1994


7.  Security Considerations

  Security issues are not discussed in this memo.

8.  Authors' Addresses

  Tracy A. Brown
  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]



























AToM MIB Working Group                                         [Page 59]