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rfc:rfc1595

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.

AToM MIB Working Group [Page 2] 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).

AToM MIB Working Group [Page 6] 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

AToM MIB Working Group [Page 9] 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:
  1. - 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

  1. - 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:
  1. - STS-Path AIS defect is detected as all ones in bytes

H1 and H2 in three contiguous frames.

  1. - 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:
  1. - VT-Path AIS defect is detected by a VT PTE as all

ones in bytes V1 and V2 in three contiguous VT

             superframes.
  1. - 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:
  1. - 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.

  1. - 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:
  1. - 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.
  1. - 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:
  1. - VT-Path RDI defect is the occurrence of a "1" in bit

4 of the VT-Path Overhead byte (V5) in five contiguous

             frames.
  1. - 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;
  1. - 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: tacox@mail.bellcore.com
                       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: kaj@cc.bellcore.com"
            DESCRIPTION
                 "The MIB module to describe
                 SONET/SDH interfaces objects."
            ::= { transmission 39 }
  1. - 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 }
  1. - 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 }
  1. - the SONET/SDH Medium group
  1. - SONET/SDH interfaces for some applications may be
  2. - electrical interfaces and not optical interfaces.
  3. - This group handles the configuration information for
  4. - both optical SONET/SDH interfaces and electrical
  5. - 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 }
  1. - the SONET/SDH Section group
  1. - this group consists of 2 tables:
  2. - - the SONET/SDH Section Current Table
  3. - - the SONET/SDH Section Interval Table
  1. - the SONET/SDH Section Current Table
  1. - The SONET/SDH Section
  2. - current table contains various statistics
  3. - 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 }
  1. - the SONET/SDH Section Interval Table
  1. - The SONET/SDH Section Interval Table
  2. - contains various statistics
  3. - collected by each system over a maximum
  4. - of the previous 24 hours of
  5. - operation. The past 24 hours may be broken into 96
  6. - completed 15 minute intervals.
  7. - A system is required to store at
  8. - least 4 completed 15 minute interval.
  9. - 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 }
  1. - the SONET/SDH Line group
  1. - this group consists of 2 tables:
  2. - - the SONET/SDH Line Current Table
  3. - - the SONET/SDH Line Interval Table
  1. - the SONET/SDH Line Current Table
  1. - The SONET/SDH Line
  2. - current table contains various statistics
  3. - 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 }
  1. - the SONET/SDH Line Interval Table
  1. - The SONET/SDH Line Interval Table

AToM MIB Working Group [Page 27] RFC 1595 SONET/SDH Objects March 1994

  1. - contains various statistics
  2. - collected by each system over a maximum
  3. - of the previous 24 hours of
  4. - operation. The past 24 hours may be broken into 96
  5. - completed 15 minute intervals.
  6. - A system is required to store at
  7. - least 4 completed 15 minute interval.
  8. - 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 }
  1. - The SONET/SDH Far End Line group.
  2. - This group may only be implemented by SONET/SDH (LTEs)
  3. - systems that provide for a far end block error (FEBE)
  4. - information at the SONET/SDH Line Layer.
  1. - This group consists of two tables:
  2. - SONET/SDH Far End Line Current Table
  3. - SONET/SDH Far End Line Interval Table
  1. - The SONET/SDH Far End Line Current Table
  1. - The SONET/SDH Far End Line Current table contains
  2. - various statistics being
  3. - collected for the current 15 minute interval.
  4. - The statistics are collected from the far end
  5. - block error code (FEBE)
  6. - within the third Z2 byte of the Line Overhead
  7. - in Broadband ISDN applications.
  8. - The definitions are the same as described for
  9. - 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 }
  1. - The SONET/SDH Far End Line Interval Table
  1. - The SONET/SDH Far End Line Interval Table
  2. - contains various statistics
  3. - collected by each system over a maximum
  4. - of the previous 24 hours of
  5. - operation. The past 24 hours may be broken into 96
  6. - completed 15 minute intervals.
  7. - A system is required to store at
  8. - least 4 completed 15 minute interval.
  9. - 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 }
  1. - the SONET/SDH Path group
  1. - this group consists of 2 tables:
  2. - - the SONET/SDH Path Current Table
  3. - - the SONET/SDH Path Interval Table
  1. - the SONET/SDH Path Current Table
  1. - The SONET/SDH Path
  2. - current table contains various statistics
  3. - 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

  1. - the SONET/SDH Path Interval Table
  1. - The SONET/SDH Path Interval Table
  2. - contains various statistics
  3. - collected by each system over a maximum
  4. - of the previous 24 hours of
  5. - operation. The past 24 hours may be broken into 96
  6. - completed 15 minute intervals.
  7. - A system is required to store at
  8. - least 4 completed 15 minute interval.
  9. - 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 }
  1. - The SONET/SDH Far End Path group
  1. - This group consists of two tables:
  2. - - SONET/SDH Far End Path Current Table
  3. - - SONET/SDH Far End Path Interval Table
  1. - The SONET/SDH Far End Path Current Table
  1. - The SONET/SDH Far End Path Current table
  2. - contains various statistics
  3. - being collected for the current 15 minute interval.
  4. - The statistics are collected from
  5. - the far end block error code
  6. - (FEBE) within the G1 byte of the Path Overhead.
  7. - The definitions are the same as described for
  8. - 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 }
  1. - The SONET/SDH Far End Path Interval Table
  1. - The SONET/SDH Far End Path Interval Table
  2. - contains various statistics
  3. - collected by each system over a maximum
  4. - of the previous 24 hours of
  5. - operation. The past 24 hours may be broken into 96
  6. - completed 15 minute intervals.
  7. - A system is required to store at
  8. - least 4 completed 15 minute interval.
  9. - 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 }
  1. - the SONET/SDH Virtual Tributary group
  1. - this group consists of 2 tables:
  2. - - the SONET/SDH VT Current Table
  3. - - the SONET/SDH VT Interval Table
  1. - For SDH signals, virtual tributaries are
  2. - called VCs instead of VTs
  1. - A VT1.5 = VC11
  2. - A VT2 = VC12
  3. - A VT3 = none
  4. - A VT6 = VC3
  1. - the SONET/SDH VT Current Table
  1. - The SONET/SDH VT current table
  2. - contains various statistics
  3. - being collected for the
  4. - 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 }
  1. - the SONET/SDH VT Interval Table
  1. - The SONET/SDH VT Interval Table
  2. - contains various statistics
  3. - collected by each system over a maximum
  4. - of the previous 24 hours of
  5. - operation. The past 24 hours may be broken into 96
  6. - completed 15 minute intervals.
  7. - A system is required to store at
  8. - least 4 completed 15 minute interval.
  9. - 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 }
  1. - The SONET/SDH Far End VT group
  1. - This group consists of two tables:
  2. - SONET/SDH Far End VT Current Table
  3. - SONET/SDH Far End VT Interval Table
  1. - The SONET/SDH Far End VT Current
  1. - The SONET/SDH Far End VT Current table
  2. - contains various statistics
  3. - being collected for the current 15 minute interval.
  4. - The statistics are collected from
  5. - the far end block error code
  6. - (FEBE) within the G1 byte of the VT Overhead.
  7. - The definitions are the same as described for
  8. - 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 }
  1. - The SONET/SDH Far End VT Interval Table
  1. - The SONET/SDH Far End VT Interval Table
  2. - contains various statistics
  3. - collected by each system over a maximum
  4. - of the previous 24 hours of
  5. - operation. The past 24 hours may be broken into 96
  6. - completed 15 minute intervals.
  7. - A system is required to store at
  8. - least 4 completed 15 minute interval.
  9. - 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 }
  1. - conformance information
        sonetConformance OBJECT IDENTIFIER ::= { sonetMIB 4 }
        sonetGroups      OBJECT IDENTIFIER ::= { sonetConformance 1 }
        sonetCompliances OBJECT IDENTIFIER ::= { sonetConformance 2 }
  1. - 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 }
  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: tacox@mail.bellcore.com
 Kaj Tesink
 Bell Communications Research
 331 Newman Springs Road
 P.O. Box 7020
 Red Bank, NJ  07701-7020
 Phone: (908) 758-5254
 EMail: kaj@cc.bellcore.com

AToM MIB Working Group [Page 59]

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