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.

Copyright Notice

Copyright © The Internet Society (1999). All Rights Reserved.

1. 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) interfaces. This document is a companion to the documents that define Managed Objects for the DS1/E1/DS2/E2 and DS3/E3 Interface Types [24][25].

Textual Conventions used in this MIB are defined in [6] and [36].

This memo replaces RFC 1595 [30]. Changes relative to RFC 1595 are summarized in the MIB module's REVISION clause.

Table of Contents

   1 Abstract ..............................................    1
   2 The SNMP Network Management Framework .................    2
   3 Overview ..............................................    3
   3.1 Use of the ifTable ..................................    4
   3.2 Use of ifTable for  SONET/SDH  Medium/Section/Line
       Layer ...............................................    5
   3.3 Use of ifTable for SONET/SDH Paths ..................    6
   3.4 Use of ifTable for SONET/SDH VTs/VCs ................    7
   3.5 SONET/SDH Terminology ...............................    8
   4 Object Definitions ....................................   16
   4.1 The SONET/SDH Medium Group ..........................   19
   4.2 The SONET/SDH Section Group .........................   23
   4.2.1 The SONET/SDH Section Current Group ...............   23
   4.2.2 The SONET/SDH Section Interval Group ..............   26
   4.3 The SONET/SDH Line Group ............................   28
   4.3.1 The SONET/SDH Line Current Group ..................   28
   4.3.2 The SONET/SDH Line Interval Group .................   30
   4.4 The SONET/SDH Far End Line Group ....................   32
   4.4.1 The SONET/SDH Far End Line Current Group ..........   33
   4.4.2 The SONET/SDH Far End Line Interval Group .........   34
   4.5 The SONET/SDH Path Group ............................   37
   4.5.1 The SONET/SDH Path Current Group ..................   37
   4.5.2 The SONET/SDH Path Interval Group .................   39
   4.6 The SONET/SDH Far End Path Group ....................   42
   4.6.1 The SONET/SDH Far End Path Current Group ..........   42
   4.6.2 The SONET/SDH Far End Path Interval Group .........   44
   4.7 The SONET/SDH Virtual Tributary Group ...............   46
   4.7.1 The SONET/SDH VT Current Group ....................   46
   4.7.2 The SONET/SDH VT Interval Group ...................   49
   4.8 The SONET/SDH Far End VT Group ......................   51
   4.8.1 The SONET/SDH Far End VT Current Group ............   51
   4.8.2 The SONET/SDH Far End VT Interval Group ...........   53
   4.9 Conformance Information .............................   55
   4.10 Compliance Statements ..............................   56
   5 Acknowledgments .......................................   65
   6 Security Considerations ...............................   65
   7 References ............................................   66
   8 Author's Address ......................................   69
   9 Intellectual Property .................................   69
   Appendix A ..............................................   70
   Appendix B ..............................................   72
   Full Copyright Statement ................................   74

2. The SNMP Network Management Framework

The SNMP Management Framework presently consists of five major components:

   0    An overall architecture, described in RFC 2271 [1].
   
   0    Mechanisms for describing and naming objects and events for the
        purpose of management.  The first version of this Structure of
        Management Information (SMI) is called SMIv1 and described in
        STD 16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4].
        The second version, called SMIv2, is described in RFC 1902 [5],
        RFC 1903 [6] and RFC 1904 [7].
   
   0    Message protocols for transferring management information.  The
        first version of the SNMP message protocol is called SNMPv1 and
        described in STD 15, RFC 1157 [8].  A second version of the SNMP
        message protocol, which is not an Internet standards track
        protocol, is called SNMPv2c and described in RFC 1901 [9] and
        RFC 1906 [10].  The third version of the message protocol is
        called SNMPv3 and described in RFC 1906 [10], RFC 2272 [11] and
        RFC 2274 [12].
   
   0    Protocol operations for accessing management information.  The
        first set of protocol operations and associated PDU formats is
        described in STD 15, RFC 1157 [8].  A second set of protocol
        operations and associated PDU formats is described in RFC 1905
        [13].
   
   0    A set of fundamental applications described in RFC 2273 [14] and
        the view-based access control mechanism described in RFC 2275
        [15].

Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI.

This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (e.g., use of Counter64). Some machine readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB.

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 [19][20][21] and CCITT
   G.707, 708, 709, and G.783 [26][27][28][29].

3.1. Use of the ifTable

This section specifies how the MIB II interfaces group, as defined in [23], 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 terminates all SONET/SDH layers. For example, a 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 [16], as extended by [23], 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 [23], as follows:

                 _____________________________
                |             |          |    |  >
                |             |          |    |  |
                |    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 [23].

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

Only the ifGeneralInformationGroup 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   Default value is enabled(1).
                             Just read-only access may be supported.
   
    ifHighSpeed       Speed of line in Mega-bits per second
                      (e.g., 155 Mbps)

ifConnectorPresent Set to true(1).

    ifAlias            The (non-volatile) alias name for this interface
                       as assigned by the network manager.

3.3. Use of ifTable for SONET/SDH Paths

Only the ifGeneralInformationGroup 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).

    ifAlias            The (non-volatile) alias name for this interface
                       as assigned by the network manager.

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

Only the ifGeneralInformationGroup 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).

    ifAlias            The (non-volatile) alias name for this interface
                       as assigned by the network manager.

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 T1.231 [22][31][35]. 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 [29]. 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 [29]. If the definition in this document does not match the definition in the T1.231 document, the implementer should follow the definition described in this document. In some cases other or additional references are used as compared with the ones cited above. This will be indicated in the text.

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 word 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.

A 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.

A 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 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

A 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.

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

VT Loss of Pointer

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

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

Line Alarm Indication Signal

A Line Alarm Indication Signal (L-AIS) is defined in ANSI

T1.105. The following criteria are specific to the L-AIS

defect:

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

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

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

STS-Path Alarm Indication Signal

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

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

-- The STS-Path AIS defect is terminated when a valid STS

Pointer is detected with the NDF set to "1001" (inverted) for

one frame, or "0110" (normal) for three contiguous frames.

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

VT-Path Alarm Indication Signal

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

-- VT-Path AIS defect is detected by a VT PTE as all ones in

bytes V1 and V2 in three contiguous VT superframes.

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

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

Line Remote Defect Indication

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

-- Line RDI defect is a "110" code in bits 6, 7, and 8 of the K2 byte of in STS-1 #1 in x consecutive frames, where x = 5 [31][35] or 10 [35].

-- Line RDI defect is terminated when any code other than "110" is detected in bits 6, 7, and 8 of the K2 byte in x consecutive frames, where x = 5 [31][35] or 10 [35].

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

STS-Path Remote Defect Indication

        STS-Path RDI (aka STS-Path FERF) signal shall be generated
        within 100 milliseconds by the STS PTE upon detection of an AIS
        or LOP defect.  Transmission of the STS-Path RDI signal shall
        cease within 100 milliseconds when the STS PTE no longer detects
        STS-Path AIS or STS-Path LOP defect.  The STS-Path RDI  shall
        accurately report the presence or absence of STS-Path AIS or
        STS-Path LOP defects.  STS-Path RDI defect is defined in ANSI

T1.105. The following requirements are specific to the STS-Path RDI defect:

-- STS-Path RDI is detected by all STS PTEs. STS-Path RDI is detected by the upstream STS PTE as a "1" in bit five of the Path Status byte (G1) for x consecutive frames, where x = 5 [31] or 10 [35].

-- Removal of STS-Path Remote Defect Indication is detected by a "0" in bit 5 of the G1 byte in x consecutive frames, where x = 5 [31] or 10 [35].

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

VT-Path Remote Defect Indication

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

-- VT-Path RDI defect is the occurrence of a "1" in bit 4 of the VT-Path Overhead byte (V5) in x consecutive frames, where x = 5 [31] or 10 [35].

-- VT-Path RDI defect is terminated when a "0" is detected in bit 4 of the VT-Path Overhead byte (V5) for x consecutive frames, where x = 5 [31] or 10 [35].

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.

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

According to [22][31][32][34][35] 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. The values of x in RFC1595[30] were based on [22] and [32] (see Appendix B). These values have subsequently been relaxed in [31][34][35]. In addition, according to G.826 [33] SESs are measured as a percentage of errored blocks.

To deal with these sets of definitions this memo defines an object sonetSESThresholdSet that determines the correct interpretation of SES. For backward compatibility, if this object is not implemented the interpretation of Appendix B shall apply. Otherwise, a more recent interpretation is suggested. An agent is not required to support all sets of definitions.

Note that if a manager changes the value of this object all SES statistics collected prior to this change shall be invalidated.

Severely Errored Framing Seconds

A Severely Errored Framing Second (SEFS) is a second 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 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.

Note that this definition implies that the agent cannot determine until after a ten second interval has passed whether a given one-second interval belongs to available or unavailable time. If the agent chooses to update the various performance statistics in real time then it must be prepared to retroactively reduce the ES, SES, and SEFS counts by 10 and increase the UAS count by 10 when it determines that available time has been entered. It must also be prepared to reduce the CV count by the number of violations counted since the onset of unavailable time. The agent must be similarly prepared to retroactively decrease the UAS count by 10 and increase the ES and CV counts as necessary upon entering available time. A special case exists when the 10 second period leading to available or unavailable time crosses a 900 second statistics window boundary, as the foregoing description implies that the CV, ES, SES, SEFS, and UAS counts the PREVIOUS interval must be adjusted. In this case successive GETs of the affected sonetPathIntervalSES and sonetPathIntervalUAS objects (and the analogous Line and VT objects also) objects will return differing values if the first GET occurs during the first few seconds of the window.

According to ANSI T1.231 unavailable time begins at the _onset_ of 10 contiguous severely errored seconds -- that is, unavailable time starts with the _first_ of the 10 contiguous SESs. Also, while an interface is deemed unavailable all counters for that interface are frozen except for the UAS count. It follows that an implementation which strictly complies with this standard must _not_ increment any counters other than the UAS count -- even temporarily -- as a result of anything that happens during those 10 seconds. Since changes in the signal state lag the data to which they apply by 10 seconds, an ANSI- compliant implementation must pass the one-second statistics through a 10-second delay line prior to updating any counters. That can be done by performing the following steps at the end of each one second interval.

   i)   Read near/far end CV counter and alarm status flags from the
   
        hardware.

ii) Accumulate the CV counts for the preceding second and compare

them to the ES and SES threshold for the layer in question. Update the signal state and shift the one-second CV counts and ES/SES flags into the 10-element delay line. Note that far-end one-second statistics are to be flagged as "absent" during any second in which there is an incoming defect at the layer in question or at any lower layer.

iii) Update the current interval statistics using the signal state

from the _previous_ update cycle and the one-second CV counts

and ES/SES flags shifted out of the 10-element delay line.

This approach is further described in Appendix A. An agent may choose to use this approach in lieu of retroactive adjustments to the counters.

In any case, a linkDown trap shall be sent only after the agent has determined for certain that the unavailable state has been entered, but the time on the trap will be that of the first UAS (i.e., 10 seconds earlier). A linkUp trap shall be handled similarly.

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. While a Path is unequipped or has mismatched signal labels ES/SES counts continue, but these conditions do not themselves contribute to ES/SES.

Circuit Identifier

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

4. Object Definitions

SONET-MIB DEFINITIONS ::= BEGIN

IMPORTS

    MODULE-IDENTITY, OBJECT-TYPE,
    Integer32, transmission
          FROM SNMPv2-SMI
    DisplayString, TruthValue
          FROM SNMPv2-TC
    MODULE-COMPLIANCE, OBJECT-GROUP
          FROM SNMPv2-CONF
    ifIndex
          FROM IF-MIB
    PerfCurrentCount, PerfIntervalCount
          FROM PerfHist-TC-MIB;

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

sonetMIB MODULE-IDENTITY

    LAST-UPDATED "9810190000Z"
    ORGANIZATION "IETF AToM MIB Working Group"
    CONTACT-INFO
      "Kaj Tesink
       Telcordia Technologies
       Tel: (732) 758-5254
       Fax: (732) 758-2269
       E-mail: kaj@research.telcordia.com."
    DESCRIPTION
         "The MIB module to describe
         SONET/SDH interfaces objects."
    
    REVISION      "9810190000Z"
    DESCRIPTION
        "The key changes made to this MIB module
        since its initial publication in RFC 1595
        are as follows.

(1) The MODULE-IDENTITY has been updated to reflect the

changes to the MIB.

(2) Where applicable, the textual conventions

PerfCurrentCount and PerfIntervalCount from

PerfHist-TC-MIB have been used in place of Gauge32.

(3) An agent now has the option to delay updates to

the various performance counts in lieu of performing retroactive adjustments upon entering into or exiting from unavailable time. This implementation option is described in Appendix A of this memo.

(4) In order to make the SONET-MIB more useful for

circuit provisioning, the formerly read-only objects sonetMediumType, sonetMediumLineCoding, sonetMediumLineType, and sonetMediumCircuitIdentifier have been given a MAX-ACCESS of read-write. The MIN-ACCESS remains read-only.

(5) The DESCRIPTION clause for sonetMediumTimeElapsed has

been updated to describe its behaviour if the duration

of the current interval exceeds the maximum value.

(6) The DESCRIPTION clause for sonetMediumValidIntervals

has been updated to describe its behaviour when some intervals may be unavailable, and the object sonetMediumInvalidIntervals has been added to keep count of the number of missing intervals (if any).

(7) The object sonetMediumLoopbackConfig has been added

to enable or disable loopback configurations.

(8) Because the error count thresholds for declaring

severely errored seconds that are specified in ANSI T1.231-1993, ITU-T G.826-1995, and ANSI T1.231-1997 are all different from each other and from the thresholds specified in RFC 1595, an enumerated INTEGER object sonetSESthresholdSet has been added to allow an agent to specify which threshold set is in use. Text has been added to Section 3 stating that if this object is not implemented the thresholds specified in RFC 1595

should be assumed, and the table containing those

thresholds has been moved to Appendix B of this memo.

(9) A column with SYNTAX TruthValue has been added to each

interval table. The purpose of the additional column is to indicate, for each interval, whether the data is valid in the sense intended by ANSI T1.231 clause 9.1.2.2 [31][35]. The objects in question are:

sonetSectionIntervalValidData sonetLineIntervalValidData sonetFarEndLineIntervalValidData sonetPathIntervalValidData sonetFarEndPathIntervalValidData sonetVTIntervalValidData sonetFarEndVTIntervalValidData

(10) The ranges for sonetPathCurrentStatus and

sonetVTCurrentStatus have been made consistent
with the DESCRIPTION clauses.

(11) The conformance information has been updated. Previous

conformance information from RFC 1595 has been deprecated. Some typographical errors in the deprecated section have been corrected in order to prevent MIB compilation errors."

    REVISION      "9401030000Z"
    DESCRIPTION
        "The RFC1595 version of this MIB module."
    
    ::= { transmission 39 }

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

sonetObjects OBJECT IDENTIFIER ::= { sonetMIB 1 }

sonetObjectsPath OBJECT IDENTIFIER ::= { sonetMIB 2 }

sonetObjectsVT OBJECT IDENTIFIER ::= { sonetMIB 3 }

-- groups in the SONET/SDH MIB module

sonetMedium OBJECT IDENTIFIER ::= { sonetObjects 1 }

sonetSection OBJECT IDENTIFIER ::= { sonetObjects 2 }

sonetLine OBJECT IDENTIFIER ::= { sonetObjects 3 }

sonetFarEndLine OBJECT IDENTIFIER ::= { sonetObjects 4 }

sonetPath OBJECT IDENTIFIER ::= { sonetObjectsPath 1 }

sonetFarEndPath OBJECT IDENTIFIER ::= { sonetObjectsPath 2 }

sonetVT OBJECT IDENTIFIER ::= { sonetObjectsVT 1 }

sonetFarEndVT OBJECT IDENTIFIER ::= { sonetObjectsVT 2 }

-- the SONET/SDH Medium group

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

sonetMediumTable OBJECT-TYPE

    SYNTAX  SEQUENCE OF SonetMediumEntry
    MAX-ACCESS  not-accessible
    STATUS  current
    DESCRIPTION
       "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,
         sonetMediumInvalidIntervals   Integer32,
         sonetMediumLoopbackConfig     BITS
    }

sonetMediumType OBJECT-TYPE

    SYNTAX  INTEGER  {
               sonet(1),
               sdh(2)
            }
    MAX-ACCESS  read-write
    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
       measurement period. If, for some reason, such as an
       adjustment in the system's time-of-day clock, the
       current interval exceeds the maximum value, the
       agent will return the maximum value."
    ::= { sonetMediumEntry 2 }

sonetMediumValidIntervals OBJECT-TYPE

    SYNTAX  Integer32 (0..96)
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
       "The number of previous 15-minute intervals
       for which data was collected.
       A SONET/SDH interface must be capable
       of supporting 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 will be <n> unless the measurement was
       (re-)started within the last (<n>*15) minutes, in which
       case the value will be the number of complete 15
       minute intervals for which the agent has at least
       some data. In certain cases (e.g., in the case
       where the agent is a proxy) it is possible that some
       intervals are unavailable.  In this case, this
       interval is the maximum interval number for
       which data is available. "
    ::= { sonetMediumEntry 3 }

sonetMediumLineCoding OBJECT-TYPE

    SYNTAX  INTEGER {
                sonetMediumOther(1),
                sonetMediumB3ZS(2),
                sonetMediumCMI(3),
                sonetMediumNRZ(4),
                sonetMediumRZ(5)
            }
    MAX-ACCESS  read-write
    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-write
    STATUS  current
    DESCRIPTION
       "This variable describes the line type for
       this interface. The line types are
       Short and Long Range
       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-write
    STATUS  current
    DESCRIPTION
       "This variable contains the transmission
       vendor's circuit identifier, for the
       purpose of facilitating troubleshooting.
       Note that the circuit identifier, if available,

       is also represented by ifPhysAddress."
    ::= { sonetMediumEntry 6 }
sonetMediumInvalidIntervals OBJECT-TYPE
    SYNTAX  Integer32 (0..96)
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
        "The number of intervals in the range from
        0 to sonetMediumValidIntervals for which no
        data is available. This object will typically
        be zero except in cases where the data for some
        intervals are not available (e.g., in proxy
        situations)."
    ::= { sonetMediumEntry 7 }

sonetMediumLoopbackConfig OBJECT-TYPE

    SYNTAX      BITS {
                  sonetNoLoop(0),
                  sonetFacilityLoop(1),
                  sonetTerminalLoop(2),
                  sonetOtherLoop(3) }
    MAX-ACCESS  read-write
    STATUS      current
    DESCRIPTION
       "The current loopback state of the SONET/SDH interface.  The
        values mean:

sonetNoLoop

Not in the loopback state. A device that is not

capable of performing a loopback on this interface

shall always return this value.

sonetFacilityLoop

The received signal at this interface is looped back out through the corresponding transmitter in the return direction.

sonetTerminalLoop

The signal that is about to be transmitted is connected to the associated incoming receiver.

sonetOtherLoop

Loopbacks that are not defined here."

    ::= { sonetMediumEntry 8 }

sonetSESthresholdSet OBJECT-TYPE

SYNTAX INTEGER {

               other(1),
               Bellcore1991(2),
               ansi1993(3),
               itu1995(4),
               ansi1997(5)
                      }
    MAX-ACCESS      read-write
    STATUS          current
    DESCRIPTION
      "An enumerated integer indicating which
       recognized set of SES thresholds that
       the agent uses for determining severely
       errored seconds and unavailable time.

other(1)

None of the following.

Bellcore1991(2)

         Bellcore TR-NWT-000253, 1991 [32], or
         ANSI T1M1.3/93-005R2, 1993 [22].
         See also Appendix B.

ansi1993(3)

         ANSI T1.231, 1993 [31], or
         Bellcore GR-253-CORE, Issue 2, 1995 [34]

itu1995(4)

         ITU Recommendation G.826, 1995 [33]

ansi1997(5)

ANSI T1.231, 1997 [35]

       If a manager changes the value of this
       object then the SES statistics collected
       prior to this change must be invalidated."
     ::= { sonetMedium 2 }

-- the SONET/SDH Section group

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

-- the SONET/SDH Section Current Table

-- The SONET/SDH Section

-- current table contains various statistics

-- being collected for the current 15 minute interval.

sonetSectionCurrentTable OBJECT-TYPE

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

sonetSectionCurrentEntry OBJECT-TYPE

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

SonetSectionCurrentEntry ::=

    SEQUENCE {
        sonetSectionCurrentStatus   Integer32,
        sonetSectionCurrentESs      PerfCurrentCount,
        sonetSectionCurrentSESs     PerfCurrentCount,
        sonetSectionCurrentSEFSs    PerfCurrentCount,
        sonetSectionCurrentCVs      PerfCurrentCount
    }

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

sonetSectionCurrentSEFSs OBJECT-TYPE

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

-- the SONET/SDH Section Interval Table

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

sonetSectionIntervalTable OBJECT-TYPE

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

sonetSectionIntervalEntry OBJECT-TYPE

    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     PerfIntervalCount,
         sonetSectionIntervalSESs    PerfIntervalCount,
         sonetSectionIntervalSEFSs   PerfIntervalCount,
         sonetSectionIntervalCVs     PerfIntervalCount,
         sonetSectionIntervalValidData  TruthValue
    }

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  PerfIntervalCount
    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  PerfIntervalCount
    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  PerfIntervalCount
    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  PerfIntervalCount
    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 }

sonetSectionIntervalValidData OBJECT-TYPE

    SYNTAX  TruthValue
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
       "This variable indicates if the data for this
        interval is valid."
    ::= { sonetSectionIntervalEntry 6 }

-- the SONET/SDH Line group

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

-- the SONET/SDH Line Current Table

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

sonetLineCurrentTable OBJECT-TYPE

    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       PerfCurrentCount,
         sonetLineCurrentSESs      PerfCurrentCount,
         sonetLineCurrentCVs       PerfCurrentCount,
         sonetLineCurrentUASs      PerfCurrentCount
     }

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 }

sonetLineCurrentESs OBJECT-TYPE

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

-- the SONET/SDH Line Interval Table

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

sonetLineIntervalTable OBJECT-TYPE

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

sonetLineIntervalEntry OBJECT-TYPE

SYNTAX SonetLineIntervalEntry

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

SonetLineIntervalEntry ::=

    SEQUENCE {
        sonetLineIntervalNumber    Integer32,
        sonetLineIntervalESs       PerfIntervalCount,
        sonetLineIntervalSESs      PerfIntervalCount,
        sonetLineIntervalCVs       PerfIntervalCount,
        sonetLineIntervalUASs      PerfIntervalCount,
        sonetLineIntervalValidData TruthValue
    }

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

sonetLineIntervalESs OBJECT-TYPE

    SYNTAX  PerfIntervalCount
    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 PerfIntervalCount

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

sonetLineIntervalValidData OBJECT-TYPE

    SYNTAX  TruthValue
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
       "This variable indicates if the data for this
        interval is valid."
    ::= { sonetLineIntervalEntry 6 }

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

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

-- The SONET/SDH Far End Line Current Table

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

sonetFarEndLineCurrentTable OBJECT-TYPE

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

sonetFarEndLineCurrentEntry OBJECT-TYPE

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

SonetFarEndLineCurrentEntry ::=

SEQUENCE {

        sonetFarEndLineCurrentESs       PerfCurrentCount,
        sonetFarEndLineCurrentSESs      PerfCurrentCount,
        sonetFarEndLineCurrentCVs       PerfCurrentCount,
        sonetFarEndLineCurrentUASs      PerfCurrentCount
       }

sonetFarEndLineCurrentESs OBJECT-TYPE

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

sonetFarEndLineCurrentSESs OBJECT-TYPE

   SYNTAX  PerfCurrentCount
   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  PerfCurrentCount
   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  PerfCurrentCount
   MAX-ACCESS  read-only
   STATUS  current
   DESCRIPTION
       "The counter associated with the number of
       Far End Unavailable Seconds
       encountered by a
       SONET/SDH Medium/Section/Line
       interface in the current 15 minute interval."
   ::= { sonetFarEndLineCurrentEntry 4 }

-- The SONET/SDH Far End Line Interval Table

-- The SONET/SDH Far End Line Interval Table
-- contains various statistics
-- collected by each system over a maximum

-- of the previous 24 hours of
-- operation. The past 24 hours may be broken into 96
-- completed 15 minute intervals.
-- A system is required to store at
-- least 4 completed 15 minute interval.
-- The default value is 32 intervals.

sonetFarEndLineIntervalTable OBJECT-TYPE

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

sonetFarEndLineIntervalEntry OBJECT-TYPE

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

SonetFarEndLineIntervalEntry ::=

    SEQUENCE {
         sonetFarEndLineIntervalNumber    Integer32,
         sonetFarEndLineIntervalESs       PerfIntervalCount,
         sonetFarEndLineIntervalSESs      PerfIntervalCount,
         sonetFarEndLineIntervalCVs       PerfIntervalCount,
         sonetFarEndLineIntervalUASs      PerfIntervalCount,
         sonetFarEndLineIntervalValidData TruthValue
    }

sonetFarEndLineIntervalNumber 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."
   ::= { sonetFarEndLineIntervalEntry 1 }

sonetFarEndLineIntervalESs OBJECT-TYPE

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

sonetFarEndLineIntervalUASs OBJECT-TYPE

   SYNTAX  PerfIntervalCount
   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 }

sonetFarEndLineIntervalValidData OBJECT-TYPE

    SYNTAX  TruthValue
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
       "This variable indicates if the data for this
        interval is valid."
    ::= { sonetFarEndLineIntervalEntry 6 }

-- the SONET/SDH Path group

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

-- the SONET/SDH Path Current Table

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

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

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

SonetPathCurrentEntry ::=

SEQUENCE {

        sonetPathCurrentWidth      INTEGER,
        sonetPathCurrentStatus     Integer32,
        sonetPathCurrentESs        PerfCurrentCount,
        sonetPathCurrentSESs       PerfCurrentCount,
        sonetPathCurrentCVs        PerfCurrentCount,
        sonetPathCurrentUASs       PerfCurrentCount
    }

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..62)
    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
         4   sonetPathSTSAIS
         8   sonetPathSTSRDI

        16   sonetPathUnequipped
        32   sonetPathSignalLabelMismatch"
::= { sonetPathCurrentEntry 2 }

sonetPathCurrentESs OBJECT-TYPE
    SYNTAX  PerfCurrentCount
    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  PerfCurrentCount
    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  PerfCurrentCount
    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  PerfCurrentCount
    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 }

-- the SONET/SDH Path Interval Table

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

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

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

SonetPathIntervalEntry ::=

    SEQUENCE {
         sonetPathIntervalNumber     Integer32,
         sonetPathIntervalESs        PerfIntervalCount,
         sonetPathIntervalSESs       PerfIntervalCount,
         sonetPathIntervalCVs        PerfIntervalCount,
         sonetPathIntervalUASs       PerfIntervalCount,
         sonetPathIntervalValidData  TruthValue
    }

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.
       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  PerfIntervalCount
    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  PerfIntervalCount
    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  PerfIntervalCount
    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  PerfIntervalCount
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
     "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 }

sonetPathIntervalValidData OBJECT-TYPE

    SYNTAX  TruthValue
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
       "This variable indicates if the data for this
        interval is valid."
    ::= { sonetPathIntervalEntry 6 }

-- The SONET/SDH Far End Path group

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

-- The SONET/SDH Far End Path Current Table

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

sonetFarEndPathCurrentTable OBJECT-TYPE

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

sonetFarEndPathCurrentEntry OBJECT-TYPE

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

SonetFarEndPathCurrentEntry ::=

    SEQUENCE {
        sonetFarEndPathCurrentESs       PerfCurrentCount,
        sonetFarEndPathCurrentSESs      PerfCurrentCount,
        sonetFarEndPathCurrentCVs       PerfCurrentCount,
        sonetFarEndPathCurrentUASs      PerfCurrentCount
    }

sonetFarEndPathCurrentESs OBJECT-TYPE

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

sonetFarEndPathCurrentSESs OBJECT-TYPE

    SYNTAX  PerfCurrentCount
    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  PerfCurrentCount
    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  PerfCurrentCount
   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."
   ::= { sonetFarEndPathCurrentEntry 4 }

-- The SONET/SDH Far End Path Interval Table

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

sonetFarEndPathIntervalTable OBJECT-TYPE

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

sonetFarEndPathIntervalEntry OBJECT-TYPE

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

SonetFarEndPathIntervalEntry ::=

    SEQUENCE {
         sonetFarEndPathIntervalNumber     Integer32,
         sonetFarEndPathIntervalESs        PerfIntervalCount,
         sonetFarEndPathIntervalSESs       PerfIntervalCount,
         sonetFarEndPathIntervalCVs        PerfIntervalCount,
         sonetFarEndPathIntervalUASs       PerfIntervalCount,
         sonetFarEndPathIntervalValidData  TruthValue
    }

sonetFarEndPathIntervalNumber 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."
   ::= { sonetFarEndPathIntervalEntry 1 }

sonetFarEndPathIntervalESs OBJECT-TYPE

   SYNTAX  PerfIntervalCount
   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  PerfIntervalCount
   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  PerfIntervalCount
    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 }

sonetFarEndPathIntervalUASs OBJECT-TYPE

   SYNTAX  PerfIntervalCount
   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 }

sonetFarEndPathIntervalValidData OBJECT-TYPE

    SYNTAX  TruthValue
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
       "This variable indicates if the data for this
        interval is valid."
    ::= { sonetFarEndPathIntervalEntry 6 }

-- the SONET/SDH Virtual Tributary group

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

-- For SDH signals, virtual tributaries are

-- called VCs instead of VTs

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

-- the SONET/SDH VT Current Table

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

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

sonetVTCurrentEntry OBJECT-TYPE
    SYNTAX  SonetVTCurrentEntry
    MAX-ACCESS  not-accessible
    STATUS  current
    DESCRIPTION
     "An entry in the SONET/SDH VT Current table."
    INDEX   { ifIndex }
::= { sonetVTCurrentTable 1 }

SonetVTCurrentEntry ::=

    SEQUENCE {
        sonetVTCurrentWidth      INTEGER,
        sonetVTCurrentStatus     Integer32,
        sonetVTCurrentESs        PerfCurrentCount,
        sonetVTCurrentSESs       PerfCurrentCount,
        sonetVTCurrentCVs        PerfCurrentCount,
        sonetVTCurrentUASs       PerfCurrentCount
    }

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..126)
    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.

      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  PerfCurrentCount
    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  PerfCurrentCount
    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  PerfCurrentCount
    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  PerfCurrentCount
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
     "The counter associated with the number of
     Unavailable Seconds
     encountered by a VT in the current
     15 minute interval."
::= { sonetVTCurrentEntry 6 }

-- the SONET/SDH VT Interval Table

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

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

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

SonetVTIntervalEntry ::=

    SEQUENCE {
        sonetVTIntervalNumber     Integer32,
        sonetVTIntervalESs        PerfIntervalCount,
        sonetVTIntervalSESs       PerfIntervalCount,
        sonetVTIntervalCVs        PerfIntervalCount,
        sonetVTIntervalUASs       PerfIntervalCount,
        sonetVTIntervalValidData  TruthValue
    }

sonetVTIntervalNumber 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."
::= { sonetVTIntervalEntry 1 }

sonetVTIntervalESs OBJECT-TYPE
    SYNTAX  PerfIntervalCount
    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  PerfIntervalCount
    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  PerfIntervalCount
    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  PerfIntervalCount
    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 }

sonetVTIntervalValidData OBJECT-TYPE

    SYNTAX  TruthValue
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
       "This variable indicates if the data for this
        interval is valid."
    ::= { sonetVTIntervalEntry 6 }

-- The SONET/SDH Far End VT group

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

-- The SONET/SDH Far End VT Current

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

sonetFarEndVTCurrentTable OBJECT-TYPE

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

sonetFarEndVTCurrentEntry OBJECT-TYPE

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

SonetFarEndVTCurrentEntry ::=

    SEQUENCE {
        sonetFarEndVTCurrentESs       PerfCurrentCount,
        sonetFarEndVTCurrentSESs      PerfCurrentCount,
        sonetFarEndVTCurrentCVs       PerfCurrentCount,
        sonetFarEndVTCurrentUASs      PerfCurrentCount
    }

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

sonetFarEndVTCurrentSESs OBJECT-TYPE

    SYNTAX  PerfCurrentCount
    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  PerfCurrentCount
    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  PerfCurrentCount
   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 the current 15 minute interval."
   ::= { sonetFarEndVTCurrentEntry 4 }

-- The SONET/SDH Far End VT Interval Table

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

sonetFarEndVTIntervalTable OBJECT-TYPE

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

sonetFarEndVTIntervalEntry OBJECT-TYPE

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

SonetFarEndVTIntervalEntry ::=

SEQUENCE {

         sonetFarEndVTIntervalNumber     Integer32,
         sonetFarEndVTIntervalESs        PerfIntervalCount,
         sonetFarEndVTIntervalSESs       PerfIntervalCount,
         sonetFarEndVTIntervalCVs        PerfIntervalCount,
         sonetFarEndVTIntervalUASs       PerfIntervalCount,
         sonetFarEndVTIntervalValidData  TruthValue
    }

sonetFarEndVTIntervalNumber 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."
    ::= { sonetFarEndVTIntervalEntry 1 }

sonetFarEndVTIntervalESs OBJECT-TYPE

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

sonetFarEndVTIntervalUASs OBJECT-TYPE

   SYNTAX  PerfIntervalCount
   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 }

sonetFarEndVTIntervalValidData OBJECT-TYPE

    SYNTAX  TruthValue
    MAX-ACCESS  read-only
    STATUS  current
    DESCRIPTION
       "This variable indicates if the data for this
        interval is valid."
    ::= { sonetFarEndVTIntervalEntry 6 }

-- conformance information

sonetConformance OBJECT IDENTIFIER ::= { sonetMIB 4 }

sonetGroups OBJECT IDENTIFIER ::= { sonetConformance 1 }

sonetCompliances OBJECT IDENTIFIER ::= { sonetConformance 2 }

-- deprecated compliance statement

sonetCompliance MODULE-COMPLIANCE

    STATUS  deprecated
    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
             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      sonetPathCurrentWidth
        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      sonetVTCurrentWidth
        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 }

-- current compliance statements

sonetCompliance2 MODULE-COMPLIANCE

    STATUS  current
    DESCRIPTION
            "The compliance statement for SONET/SDH interfaces."
    
    MODULE  -- this module
        MANDATORY-GROUPS { sonetMediumStuff2, sonetSectionStuff2 }
    
        OBJECT      sonetMediumType
        MIN-ACCESS  read-only
        DESCRIPTION
            "Write access is not required."
    
        OBJECT      sonetMediumLineCoding
        MIN-ACCESS  read-only
        DESCRIPTION
            "Write access is not required."
    
        OBJECT      sonetMediumLineType
        MIN-ACCESS  read-only
        DESCRIPTION
            "Write access is not required."
    
        OBJECT      sonetMediumCircuitIdentifier
        MIN-ACCESS  read-only
        DESCRIPTION
            "Write access is not required."
    
        OBJECT      sonetMediumLoopbackConfig
        MIN-ACCESS  read-only
        DESCRIPTION
            "Write access is not required."
    
        OBJECT      sonetSESthresholdSet
        MIN-ACCESS  read-only
        DESCRIPTION
          "Write access is not required, and only one
          of the enumerated values need be supported."
    
        GROUP       sonetLineStuff2
        DESCRIPTION
            "Implementation of this group is mandatory for all
             SONET/SDH systems that terminate SONET/SDH Lines,
             Paths or Virtual Tributaries."
    
        GROUP       sonetFarEndLineStuff2
        DESCRIPTION
            "Implementation of this group is optional for all
             SONET/SDH systems that terminate SONET/SDH Lines,
             Paths or Virtual Tributaries, and that
             provide for a far end block error (FEBE)
             information at the SONET/SDH Line Layer."
    
        GROUP       sonetPathStuff2
        DESCRIPTION
            "Implementation of this group is mandatory for all
             SONET/SDH systems that terminate SONET/SDH
             Paths or Virtual Tributaries."
    
        OBJECT      sonetPathCurrentWidth
        MIN-ACCESS  read-only
        DESCRIPTION
            "Write access is not required."
    
        GROUP       sonetFarEndPathStuff2
        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       sonetVTStuff2
        DESCRIPTION
            "Implementation of this group is mandatory for all
             SONET/SDH systems that terminate SONET/SDH Virtual
             Tributaries."
    
        OBJECT      sonetVTCurrentWidth
        MIN-ACCESS  read-only
        DESCRIPTION
            "Write access is not required."
    
        GROUP       sonetFarEndVTStuff2
        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 2 }

-- units of conformance

-- deprecated groups

sonetMediumStuff    OBJECT-GROUP
    OBJECTS { sonetMediumType,
              sonetMediumTimeElapsed,
              sonetMediumValidIntervals,
              sonetMediumLineCoding,
              sonetMediumLineType,
              sonetMediumCircuitIdentifier }
    STATUS  deprecated
    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  deprecated
    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  deprecated
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH Line interfaces."
    ::= { sonetGroups 3 }

sonetFarEndLineStuff    OBJECT-GROUP
    OBJECTS { sonetFarEndLineCurrentESs,
              sonetFarEndLineCurrentSESs,
              sonetFarEndLineCurrentCVs,
              sonetFarEndLineCurrentUASs,
              sonetFarEndLineIntervalESs,
              sonetFarEndLineIntervalSESs,
              sonetFarEndLineIntervalCVs,
              sonetFarEndLineIntervalUASs }
    STATUS  deprecated
    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  deprecated
    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  deprecated
    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,
              sonetVTCurrentESs,
              sonetVTCurrentSESs,
              sonetVTCurrentCVs,
              sonetVTCurrentUASs,
              sonetVTIntervalESs,
              sonetVTIntervalSESs,
              sonetVTIntervalCVs,
              sonetVTIntervalUASs }
    STATUS  deprecated
    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  deprecated
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH VT interfaces,
            and maintaining VT Far End information."
    ::= { sonetGroups 8 }

-- current groups

sonetMediumStuff2    OBJECT-GROUP
    OBJECTS { sonetMediumType,
              sonetMediumTimeElapsed,
              sonetMediumValidIntervals,
              sonetMediumLineCoding,
              sonetMediumLineType,
              sonetMediumCircuitIdentifier,
              sonetMediumInvalidIntervals,
              sonetMediumLoopbackConfig,
              sonetSESthresholdSet }
    STATUS  current
    DESCRIPTION
            "A collection of objects providing configuration
            information applicable to all SONET/SDH interfaces."
    ::= { sonetGroups 9 }

sonetSectionStuff2    OBJECT-GROUP
    OBJECTS { sonetSectionCurrentStatus,
              sonetSectionCurrentESs,
              sonetSectionCurrentSESs,
              sonetSectionCurrentSEFSs,
              sonetSectionCurrentCVs,
              sonetSectionIntervalESs,
              sonetSectionIntervalSESs,
              sonetSectionIntervalSEFSs,
              sonetSectionIntervalCVs,
              sonetSectionIntervalValidData }
    STATUS  current
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH Section interfaces."
    ::= { sonetGroups 10 }

sonetLineStuff2    OBJECT-GROUP
    OBJECTS { sonetLineCurrentStatus,
              sonetLineCurrentESs,
              sonetLineCurrentSESs,
              sonetLineCurrentCVs,
              sonetLineCurrentUASs,
              sonetLineIntervalESs,
              sonetLineIntervalSESs,
              sonetLineIntervalCVs,
              sonetLineIntervalUASs,
              sonetLineIntervalValidData }
    STATUS  current
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH Line interfaces."
    ::= { sonetGroups 11 }

sonetPathStuff2    OBJECT-GROUP
    OBJECTS { sonetPathCurrentWidth,
              sonetPathCurrentStatus,
              sonetPathCurrentESs,
              sonetPathCurrentSESs,
              sonetPathCurrentCVs,
              sonetPathCurrentUASs,
              sonetPathIntervalESs,
              sonetPathIntervalSESs,
              sonetPathIntervalCVs,
              sonetPathIntervalUASs,
              sonetPathIntervalValidData }
    STATUS  current
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH Path interfaces."
    ::= { sonetGroups 12 }

sonetVTStuff2    OBJECT-GROUP
    OBJECTS { sonetVTCurrentWidth,
              sonetVTCurrentStatus,
              sonetVTCurrentESs,
              sonetVTCurrentSESs,
              sonetVTCurrentCVs,
              sonetVTCurrentUASs,
              sonetVTIntervalESs,
              sonetVTIntervalSESs,
              sonetVTIntervalCVs,
              sonetVTIntervalUASs,
              sonetVTIntervalValidData }
    STATUS  current
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH VT interfaces."
    ::= { sonetGroups 13 }

sonetFarEndLineStuff2    OBJECT-GROUP
    OBJECTS { sonetFarEndLineCurrentESs,
              sonetFarEndLineCurrentSESs,
              sonetFarEndLineCurrentCVs,
              sonetFarEndLineCurrentUASs,
              sonetFarEndLineIntervalESs,
              sonetFarEndLineIntervalSESs,
              sonetFarEndLineIntervalCVs,
              sonetFarEndLineIntervalUASs,
              sonetFarEndLineIntervalValidData }
    STATUS  current
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH Line interfaces,
            and maintaining Line Far End information."
    ::= { sonetGroups 14 }

sonetFarEndPathStuff2    OBJECT-GROUP
    OBJECTS { sonetFarEndPathCurrentESs,
              sonetFarEndPathCurrentSESs,
              sonetFarEndPathCurrentCVs,
              sonetFarEndPathCurrentUASs,
              sonetFarEndPathIntervalESs,
              sonetFarEndPathIntervalSESs,
              sonetFarEndPathIntervalCVs,
              sonetFarEndPathIntervalUASs,
              sonetFarEndPathIntervalValidData }
    STATUS  current
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH Path interfaces,
            and maintaining Path Far End information."
    ::= { sonetGroups 15 }

sonetFarEndVTStuff2    OBJECT-GROUP
    OBJECTS { sonetFarEndVTCurrentESs,
              sonetFarEndVTCurrentSESs,
              sonetFarEndVTCurrentCVs,
              sonetFarEndVTCurrentUASs,
              sonetFarEndVTIntervalESs,
              sonetFarEndVTIntervalSESs,
              sonetFarEndVTIntervalCVs,
              sonetFarEndVTIntervalUASs,
              sonetFarEndVTIntervalValidData }
    STATUS  current
    DESCRIPTION
            "A collection of objects providing information
            specific to SONET/SDH VT interfaces,
            and maintaining VT Far End information."
    ::= { sonetGroups 16 }

END

5. Acknowledgments

This specification is a product of the AToM MIB Working Group. The author would like to acknowledge Mike Heard for his many valuable contributions to this memo.

6. Security Considerations

There are a number of management objects defined in this MIB that have a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations.

The managed objects in this MIB contain sensitive information since, collectively, they allow influencing of interfaces in SONET/SDH equipment or networks and provide information of their configuration.

It is thus important to control even GET access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP. Not all versions of SNMP provide features for such a secure environment.

SNMPv1 by itself is not a secure environment. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB.

It is recommended that the implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User-based Security Model RFC 2274 [12] and the View-based Access Control Model RFC 2275 [15] is recommended.

It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them.

7. References

   [1]  Harrington, D., Presuhn, R. and B. Wijnen, "An tecture for
        Describing SNMP Management Frameworks", RFC 2271, January 1998.
   
   [2]  Rose, M. and K. McCloghrie, "Structure and Identification of
        Management Information for TCP/IP-based Internets", STD 16, RFC
        1155, May 1990.
   
   [3]  Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16,
        RFC 1212, March 1991.
   
   [4]  Rose, M., "A Convention for Defining Traps for use with the
        SNMP", RFC 1215, March 1991
   
   [5]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.  and S.
        Waldbusser, "Structure of Management Information for Version 2
        of the Simple Network Management Protocol (SNMPv2)", RFC 1902,
        January 1996.
   
   [6]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.  and S.
        Waldbusser, "Textual Conventions for Version 2 of the Simple
        Network Management Protocol (SNMPv2)", RFC 1903, January 1996.
   
   [7]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.  and S.
        Waldbusser, "Conformance Statements for Version 2 of the Simple
        Network Management Protocol (SNMPv2)", RFC 1904, January 1996.
   
   [8]  Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
        Network Management Protocol", STD 15, RFC 1157, May 1990.
   
   [9]  SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M.  and S.
        Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901,
        January 1996.

[10] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S.

Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, January 1996.

   [11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
        Processing and Dispatching for the Simple Network Management
        Protocol (SNMP)", RFC 2272, January 1998.
   
   [12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)
        for version 3 of the Simple Network Management Protocol
        (SNMPv3)", RFC 2274, January 1998.

[13] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S.

Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, January 1996.

   [14] Levi, D., Meyer, P. and B. Stewart, SNMPv3 Applications", RFC
        2273, January 1998.
   
   [15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access
        Control Model (VACM) for the Simple Network Management Protocol
        (SNMP)", RFC 2275, January 1998.
   
   [16] McCloghrie, K. and M. Rose, "Management Information Base for
        Network Management of TCP/IP-based internets - MIB-II", STD 17,
        RFC 1213, March 1991.
   
   [17] Information processing systems - Open Systems Interconnection -
        Specification of Abstract Syntax Notation One (ASN.1),
        International Organization for Standardization.  International
        Standard 8824, (December, 1987).
   
   [18] 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).

[19] American National Standard for Telecommunications - Digital

Hierarchy - Optical Interface Rates and Formats Specification, ANSI T1.105-1988.

[20] American National Standard for Telecommunications - Digital

Hierarchy - Optical Interface Rates and Formats Specification, ANSI T1.105-1991.

[21] American National Standard for Telecommunications - Digital

        Hierarchy - Optical Interface Specification (Single-Mode), ANSI
        T1.106-1988.

[22] Draft American National Standard for Telecommunications -

Digital Hierarchy - Layer 1 In-Service Digital Transmission

Performance Monitoring, T1M1.3/93-005R2, July 1993.

   [23] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB",
        RFC 2233, November 1997.
   
   [24] Fowler, D., "Definitions of Managed Objects for the DS3/E3
        Interface Type", RFC 2496, January 1999.
   
   [25] Fowler, D., "Definitions of Managed Objects for the DS1, E1, DS2
        and E2 Interface Types", RFC 2495, January 1999.
   
   [26] CCITT Recommendation G.707, "Synchronous Digital Hierarchy Bit
        Rates", June 1992.
   
   [27] CCITT Recommendation G.708, "Network Node Interface for the
        Synchronous Digital Hierarchy", June 1992.
   
   [28] CCITT Recommendation G.709, "Synchronous Multiplexing
        Structure", June 1992.
   
   [29] CCITT Recommendation G.783, "Characteristics of Synchronous
        Digital Hierarchy (SDH) Multiplexing Equipment Functional
        Blocks", November 1992.
   
   [30] Brown, T. and K. Tesink, "Definitions of Managed Objects for the
        SONET/SDH Interface Type", RFC 1595, March 1994.

[31] American National Standard for Telecommunications - Digital

Hierarchy - Layer 1 In-Service Digital Transmission Performance Monitoring, ANSI T1.231-1993, September 1993.

   [32] Bellcore TR-NWT-000253, Issue 1, "Synchronous Optical Network
        (SONET) Transport Systems:  Common Generic Criteria", December
        1991.
   
   [33] ITU Recommendation G.826, "Error Performance Parameters and
        Objectives for International Constant Bit Rate Digital Paths at
        or above Primary Rate", September 1995 (COM 13-R57E).
   
   [34] Bellcore GR-253-CORE, Issue 2, "Synchronous Optical Network
        (SONET) Transport Systems Common Generic Criteria", December
        1995.

[35] American National Standard for Telecommunications - Digital

Hierarchy - Layer 1 In-Service Digital Transmission Performance Monitoring, ANSI T1.231-1997, September 1997.

   [36] Tesink, K., " Textual Conventions for MIB Modules Using
        Performance History Based on 15 Minute Intervals", RFC 2493,
        January 1999.

8. Author's Address

   Kaj Tesink
   Telcordia Technologies
   331 Newman Springs Road
   P.O. Box 7020
   Red Bank, NJ  07701-7020
   
   Phone: (732) 758-5254
   EMail: kaj@research.telcordia.com

9. Intellectual Property

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Appendix A: The delay-line approach to statistics collection.

According to ANSI T1.231 unavailable time begins at the onset of 10 contiguous severely errored seconds -- that is, unavailable time starts with the first of the 10 contiguous SESs -- and while an interface is deemed unavailable all counters for that interface are frozen except for the UAS count. Since changes in the signal state lag the data to which they apply by 10 seconds, an implementation which wishes to avoid making retroactive adjustments to the counts must pass the the one-second statistics through a 10-second delay line prior to updating any counters. That can be done by performing the following steps at the end of each one second interval.

   i)   Read near/far end line and path CV counts and alarm status flags
        from the hardware.

ii) Accumulate the CV counts for the preceding second and compare

them to the ES and SES threshold for the layer in question. Update the signal state and shift the one-second CV counts and ES/SES flags into the 10-element delay line. Note that far-end one-second statistics are to be flagged as "absent" during any second in which there is an incoming defect at the layer in question or at any lower layer.

iii) Update the current interval statistics using the signal state

from the previous update cycle and the one-second CV counts and ES/SES flags shifted out of the 10-element delay line.

   This procedure guarantees that the statistical counters will be
   correctly updated at all times, although they lag real time by 10
   seconds.  It is illustrated in the figure below.  At the end of each
   15 minutes interval the current interval counts are transferred to
   the  most recent interval entry and each interval is shifted up by
   one position, with the oldest being discarded if necessary in order
   to make room.  The current interval counts then start over from zero.
   Note, however, that the signal state calculation does not start anew
   at each interval boundary;  rather, signal state information is
   retained across interval boundaries.
   
   +--------------------------------------------------------------+
   |          READ COUNTERS & STATUS INFO FROM HARDWARE           |
   |                                                              |
   |LOS OOF/ SECT  LINE LINE LINE LINE  PATH PATH PATH PATH PATH  |
   |    LOF   CV    AIS  CV   RDI FEBE   AIS  LOP  CV   RDI  CV   |
   +--------------------------------------------------------------+
     |   |     |     |    |    |   |      |    |    |    |    |
     |   |     |     |    |    |   |      |    |    |    |    |
     V   V     V     V    V    V   V      V    V    V    V    V
   
   +--------------------------------------------------------------+
   | ACCUM ONE-SEC STATS, CHK ERR THRESHOLDS, & UPDT SIGNAL STATE |
   |                                                              |
   |                                                              |
   |                  NEAR END/FAR END       NEAR END/FAR END     |
   |SECT SECT SECT  LINE LINE LINE  LINE   PATH PATH PATH  PATH   |
   |CV   ES   SES    CV   ES   SES AVA/UNA  CV   ES   SES AVA/UNA |
   +--------------------------------------------------------------+
     |    |    |      |    |    |     |      |    |    |     |
     |    |    |      |    |    |     |      |    |    |     |
     V    V    V      V    V    V     |      V    V    V     |
   +-------------+  +-------------+   |    +-------------+   |
   |ONE-SEC DELAY|  |ONE-SEC DELAY|   |    |ONE-SEC DELAY|   |
   | (1 OF 10)   |  | (1 OF 10)   |   |    | (1 OF 10)   |   |
   |CV   ES   SES|  |CV   ES   SES|   |    |CV   ES   SES|   |
   +-------------+  +-------------+   |    +-------------+   |
     |    |    |      |    |    |     |      |    |    |     |
     /    /    /      /    /    /     /      /    /    /     /
     /    /    /      /    /    /     /      /    /    /     /
     |    |    |      |    |    |     |      |    |    |     |
     V    V    V      V    V    V     |      V    V    V     |
   +-------------+  +-------------+   |    +-------------+   |
   |ONE-SEC DELAY|  |ONE-SEC DELAY|   |    |ONE-SEC DELAY|   |
   | (10 OF 10)  |  | (10 OF 10)  |   |    | (10 OF 10)  |   |
   |CV   ES   SES|  |CV   ES   SES|   |    |CV   ES   SES|   |
   +-------------+  +-------------+   |    +-------------+   |
     |    |    |      |    |    |     |      |    |    |     |
     |    |    |      |    |    |     |      |    |    |     |
     V    V    V      V    V    V     V      V    V    V     V
   +--------------------------------------------------------------+
   |              UPDATE STATISTICS COUNTERS                      |
   |                                                              |
   |                   NEAR END/FAR END       NEAR END/FAR END    |
   |   SECTION               LINE                   PATH          |
   | CV ES EFS SES   CV ES EFS SES AS UAS   CV ES EFS SES AS UAS  |
   +--------------------------------------------------------------+

Note that if such a procedure is adopted there is no current interval data for the first ten seconds after a system comes up. noSuchInstance must be returned if a management station attempts to access the current interval counters during this time.

It is an implementation-specific matter whether an agent assumes that the initial state of the interface is available or unavailable.

Appendix B - RFC1595 SES interpretation

This appendix contains the values for x for the Section, Line, Path, and VT Layers as used in [22][30][32].

Value for x for SONET/SDH Section SES Definition

             Rate            x               Minimum Bit Error Rate
             =======================================================
             OC-1             9                      1.5 x 10^-7
             OC-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
             OC-3            32                       2 x 10^-7
             OC-9            47                       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

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