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RFC 2558

 
 
 

Definitions of Managed Objects for the SONET/SDH Interface Type

Part 3 of 3, p. 52 to 74
Prev RFC Part

 


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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 }

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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

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    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

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    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 }

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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

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             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."

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        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."

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        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 }

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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 }

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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 }

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-- 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

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            "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,

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              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

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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.

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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.

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   [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.

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   [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.

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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

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11.  Copies of
   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights which may cover technology that may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.

Top      Up      ToC       Page 70 
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

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   +--------------------------------------------------------------+
   | 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.

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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

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                  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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