tech-invite   World Map     

IETF     RFCs     Groups     SIP     ABNFs    |    3GPP     Specs     Glossaries     Architecture     IMS     UICC    |    search

RFC 2496


Pages: 60
Top     in Index     Prev     Next
 

Definitions of Managed Object for the DS3/E3 Interface Type

Part 1 of 2, p. 1 to 29
None       Next RFC Part

Obsoleted by:    3896
Obsoletes:    1407


Top       ToC       Page 1 
Network Working Group                                    D. Fowler, Editor
Request for Comments: 2496                              Newbridge Networks
Obsoletes: 1407                                               January 1999
Category: Standards Track


      Definitions of Managed Objects for the DS3/E3 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 (C) The Internet Society (1999).  All Rights Reserved.

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it describes objects used for managing DS3 and E3
   interfaces.  This document is a companion document with Definitions
   of Managed Objects for the DS0 (RFC 2494 [25]), DS1/E1/DS2/E2 (RFC
   2495 [17]), and the work in progress SONET/SDH Interface Types.

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

Table of Contents

   1 The SNMP Management Framework ................................  2
   1.1 Changes from RFC1407 .......................................  3
   2 Overview .....................................................  4
   2.1 Use of ifTable for DS3 Layer ...............................  5
   2.2 Usage Guidelines ...........................................  5
   2.2.1 Usage of ifStackTable ....................................  5
   2.2.2 Usage of Channelization for DS3, DS1, DS0 ................  7
   2.2.3 Usage of Channelization for DS3, DS2, DS1 ................  7
   2.2.4 Usage of Loopbacks .......................................  8
   2.3 Objectives of this MIB Module ..............................  9
   2.4 DS3/E3 Terminology .........................................  9
   2.4.1 Error Events ............................................. 10
   2.4.2 Performance Parameters ................................... 10

Top      ToC       Page 2 
   2.4.3 Performance Defects ...................................... 13
   2.4.4 Other Terms .............................................. 15
   3 Object Definitions ........................................... 15
   3.1 The DS3/E3 Near End Group .................................. 16
   3.1.1 The DS3/E3 Configuration Table ........................... 16
   3.1.2 The DS3/E3 Current Table ................................. 25
   3.1.3 The DS3/E3 Interval Table ................................ 28
   3.1.4 The DS3/E3 Total ......................................... 31
   3.2 The DS3 Far End Group ...................................... 34
   3.2.1 The DS3 Far End Configuration ............................ 35
   3.2.2 The DS3 Far End Current .................................. 37
   3.2.3 The DS3 Far End Interval Table ........................... 39
   3.2.4 The DS3 Far End Total .................................... 41
   3.3 The DS3/E3 Fractional Table ................................ 43
   3.4 The DS3 Trap Group ......................................... 46
   3.5 Conformance Groups ......................................... 46
   4 Appendix A - Use of dsx3IfIndex and dsx3LineIndex ............ 51
   5 Appendix B - The delay approach to Unavialable Seconds.  ..... 54
   6 Intellectual Property ........................................ 56
   7 Acknowledgments .............................................. 56
   8 References ................................................... 56
   9 Security Considerations ...................................... 58
   10 Author's Address ............................................ 59
   11 Full Copyright Statement .................................... 60

1.  The SNMP Management Framework

   The SNMP Management Framework presently consists of five major
   components:

    o   An overall architecture, described in RFC 2271 [1].

    o   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].

    o   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].

Top      ToC       Page 3 
    o   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].

    o   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 (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.

1.1.  Changes from RFC1407

   This MIB obsoletes RFC1407.  The changes from RFC1407 are the
   following:

        (1)  The Fractional Table has been deprecated

        (2)  This document uses SMIv2

        (3)  Values are given for ifTable and ifXTable

        (4)  Example usage of ifStackTable is included

        (5)  dsx3IfIndex has been deprecated

        (6)  The definition of valid intervals has been clarified
             for the case where the agent proxied for other devices.  In
             particular, the treatment of missing intervals has been
             clarified.

        (7)  An inward loopback has been added.

        (8)  Additional lineStatus bits have been added for Near End
             in Unavailable Signal State, Carrier Equipment Out of
             Service, DS@ Payload AIS, and DS@ Performance Threshold

Top      ToC       Page 4 
        (9)  A read-write line Length object has been added.

        (10) Added a lineStatus last change, trap and enabler.

        (11) Textual Conventions for statistics objects have
             been used.

        (12) A new object, dsx3LoopbackStatus, has been introduced to
             reflect the loopbacks established on a DS3/E3 interface and
             the source to the requests.  dsx3LoopbackConfig continues
             to be the desired loopback state while dsx3LoopbackStatus
             reflects the actual state.

        (13) A dual loopback has been added to allow the setting of an
             inward loopback and a line loopback at the same time.

        (14) An object has been added to indicated whether or not this
             is a channelized DS3/E3.

        (15) A new object has been added to indicate which DS1 is to set
             for remote loopback.

2.  Overview

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

        ds3 (30)

   The DS3 definitions contained herein are based on the DS3
   specifications in ANSI T1.102-1987, ANSI T1.107-1988, ANSI T1.107a-
   1990, and ANSI T1.404-1989 [8,9,9a,10].  The E3 definitions contained
   herein are based on the E3 specifications in CCITT G.751 [12].

Top      ToC       Page 5 
2.1.  Use of ifTable for DS3 Layer

   Only the ifGeneralGroup needs to be supported.

           ifTable Object    Use for DS3 Layer
======================================================================
           ifIndex           Interface index.

           ifDescr           See interfaces MIB [5]

           ifType            ds3(30)

           ifSpeed           Speed of line rate
                             DS3 - 44736000
                             E3  - 34368000

           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     See interfaces MIB [5]

           ifOperStatus      See interfaces MIB [5]

           ifLastChange      See interfaces MIB [5]

           ifName            See interfaces MIB [5]

           ifLinkUpDownTrapEnable   Set to enabled(1).

           ifHighSpeed       Speed of line in Mega-bits per second
                             (either 45 or 34)

           ifConnectorPresent Set to true(1) normally, except for
                              cases such as DS3/E3 over AAL1/ATM where
                              false(2) is appropriate

2.2.  Usage Guidelines

2.2.1.  Usage of ifStackTable

   The assignment of the index values could for example be:

           ifIndex  Description
           1        Ethernet
           2        Line#A Router
           3        Line#B Router

Top      ToC       Page 6 
           4        Line#C Router
           5        Line#D Router
           6        Line#A CSU Router
           7        Line#B CSU Router
           8        Line#C CSU Router
           9        Line#D CSU Router
           10       Line#A CSU Network
           11       Line#B CSU Network
           12       Line#C CSU Network
           13       Line#D CSU Network

   The ifStackTable is then used to show the relationships between the
   various DS3 interfaces.

           ifStackTable Entries

           HigherLayer   LowerLayer
           2             6
           3             7
           4             8
           5             9
           6             10
           7             11
           8             12
           9             13

   If the CSU shelf is managed by itself by a local SNMP Agent, the
   situation would be identical, except the Ethernet and the 4 router
   interfaces are deleted.  Interfaces would also be numbered from 1 to
   8.

           ifIndex  Description
           1        Line#A CSU Router
           2        Line#B CSU Router
           3        Line#C CSU Router
           4        Line#D CSU Router
           5        Line#A CSU Network
           6        Line#B CSU Network
           7        Line#C CSU Network
           8        Line#D CSU Network

           ifStackTable Entries

           HigherLayer   LowerLayer
           1             5
           2             6
           3             7
           4             8

Top      ToC       Page 7 
2.2.2.  Usage of Channelization for DS3, DS1, DS0

   An example is given here to explain the channelization objects in the
   DS3, DS1, and DS0 MIBs to help the implementor use the objects
   correctly. Treatment of E3 and E1 would be similar, with the number
   of DS0s being different depending on the framing of the E1.

   Assume that a DS3 (with ifIndex 1) is Channelized into DS1s (without
   DS2s).  The object dsx3Channelization is set to enabledDs1.  When
   this object is set to enabledDS1, 28 ifEntries of type DS1 will be
   created by the agent. If dsx3Channelization is set to disabled, then
   the DS1s are destroyed.

   Assume the entries in the ifTable for the DS1s are created in channel
   order and the ifIndex values are 2 through 29. In the DS1 MIB, there
   will be an entry in the dsx1ChanMappingTable for each ds1.  The
   entries will be as follows:

        dsx1ChanMappingTable Entries

        ifIndex  dsx1Ds1ChannelNumber   dsx1ChanMappedIfIndex

        1        1                      2
        1        2                      3
        ......
        1        28                     29

   In addition, the DS1s are channelized into DS0s.  The object
   dsx1Channelization is set to enabledDS0 for each DS1.  There will be
   24 DS0s in the ifTable for each DS1.  Assume the entries in the
   ifTable are created in channel order and the ifIndex values for the
   DS0s in the first DS1 are 30 through 53.  In the DS0 MIB, there will
   be an entry in the dsx0ChanMappingTable for each DS0.  The entries
   will be as follows:

        dsx0ChanMappingTable Entries

        ifIndex   dsx0Ds0ChannelNumber  dsx0ChanMappedIfIndex
        2         1                     30
        2         2                     31
        ......
        2         24                    53

2.2.3.  Usage of Channelization for DS3, DS2, DS1

   An example is given here to explain the channelization objects in the
   DS3 and DS1 MIBs to help the implementor use the objects correctly.

Top      ToC       Page 8 
   Assume that a DS3 (with ifIndex 1) is Channelized into DS2s.  The
   object dsx3Channelization is set to enabledDs2.  There will be 7 DS2s
   (ifType of DS1) in the ifTable.  Assume the entries in the ifTable
   for the DS2s are created in channel order and the ifIndex values are
   2 through 8. In the DS1 MIB, there will be an entry in the
   dsx1ChanMappingTable for each DS2.  The entries will be as follows:

        dsx1ChanMappingTable Entries

        ifIndex  dsx1Ds1ChannelNumber   dsx1ChanMappedIfIndex
        1        1                      2
        1        2                      3
        ......
        1        7                      8

   In addition, the DS2s are channelized into DS1s.  The object
   dsx1Channelization is set to enabledDS1 for each DS2.  There will be
   4 DS1s in the ifTable for each DS2.  Assume the entries in the
   ifTable are created in channel order and the ifIndex values for the
   DS1s in the first DS2 are 9 through 12, then 13 through 16 for the
   second DS2, and so on.  In the DS1 MIB, there will be an entry in the
   dsx1ChanMappingTable for each DS1.  The entries will be as follows:

        dsx1ChanMappingTable Entries

        ifIndex   dsx1Ds1ChannelNumber  dsx1ChanMappedIfIndex
        2         1                     9
        2         2                     10
        2         3                     11
        2         4                     12
        3         1                     13
        3         2                     14
        ...
        8         4                     36

2.2.4.  Usage of Loopbacks

   This section discusses the behaviour of objects related to loopbacks.

   The object dsx3LoopbackConfig represents the desired state of
   loopbacks on this interface.  Using this object a Manager can
   request:
       LineLoopback
       PayloadLoopback (if ESF framing)
       InwardLoopback
       DualLoopback (Line + Inward)
       NoLoopback

Top      ToC       Page 9 
   The remote end can also request lookbacks either through the FDL
   channel if ESF or inband if D4.  The loopbacks that can be request
   this way are:
   LineLoopback
   PayloadLoopback (if ESF framing)
   NoLoopback

   To model the current state of loopbacks on a DS3 interface, the
   object dsx3LoopbackStatus defines which loopback is currently applies
   to an interface.  This objects, which is a bitmap, will have bits
   turned on which reflect the currently active loopbacks on the
   interface as well as the source of those loopbacks.

   The following restrictions/rules apply to loopbacks:

   The far end cannot undo loopbacks set by a manager.

   A manager can undo loopbacks set by the far end.

   Both a line loopback and an inward loopback can be set at the same
   time.  Only these two loopbacks can co-exist and either one may be
   set by the manager or the far end.  A LineLoopback request from the
   far end is incremental to an existing Inward loopback established by
   a manager.  When a NoLoopback is received from the far end in this
   case, the InwardLoopback remains in place.

2.3.  Objectives of this MIB Module

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

2.4.  DS3/E3 Terminology

   The terminology used in this document to describe error conditions on
   a DS3 interface as monitored by a DS3 device are based on the late
   but not final draft of what became the ANSI T1.231 standard [11].  If
   the definition in this document does not match the definition in the
   ANSI T1.231 document, the implementer should follow the definition
   described in this document.

Top      ToC       Page 10 
2.4.1.  Error Events

     Bipolar Violation (BPV) Error Event
          A bipolar violation error event, for B3ZS(HDB3)-coded signals,
          is the occurrence of a pulse of the same polarity as the
          previous pulse without being part of the zero substitution
          code, B3ZS(HDB3).  For B3ZS(HDB3)-coded signals, a bipolar
          violation error event may also include other error patterns
          such as:  three(four) or more consecutive zeros and incorrect
          polarity. (See T1.231 section 7.1.1.1.1)

     Excessive Zeros (EXZ) Error Event
          An EXZ is the occurrence of any zero string length equal to or
          greater than 3 for B3ZS, or greater than 4 for HDB3.  (See
          T1.231 section 7.1.1.1.2)

     Line Coding Violation (LCV) Error Event
          This parameter is a count of both BPVs and EXZs occurring over
          the accumulation period.  An EXZ increments the LCV by one
          regardless of the length of the zero string. (Also known as
          CV-L.  See T1.231 section 7.4.1.1)

     P-bit Coding Violation (PCV) Error Event
          For all DS3 applications, a coding violation error event is a
          P-bit Parity Error event.  A P-bit Parity Error event is the
          occurrence of a received P-bit code on the DS3 M-frame that is
          not identical to the corresponding locally- calculated code.
          (See T1.231 section 7.1.1.2.1)

     C-bit Coding Violation (CCV) Error Event
          For C-bit Parity and SYNTRAN DS3 applications, this is the
          count of coding violations reported via the C-bits.  For C-bit
          Parity, it is a count of CP-bit parity errors occurring in the
          accumulation interval.  For SYNTRAN, it is a count of CRC-9
          errors occurring in the accumulation interval. (See T1.231
          section 7.1.1.2.2)

2.4.2.  Performance Parameters

   All performance parameters are accumulated in fifteen minute
   intervals and up to 96 intervals (24 hours worth) are kept by an
   agent.  Fewer than 96 intervals of data will be available if the
   agent has been restarted within the last 24 hours.  In addition,
   there is a rolling 24-hour total of each performance parameter.

Top      ToC       Page 11 
   There is no requirement for an agent to ensure fixed relationship
   between the start of a fifteen minute interval and any wall clock;
   however some agents may align the fifteen minute intervals with
   quarter hours.

   Performance parameters are of types PerfCurrentCount,
   PerfIntervalCount and PerfTotalCount.  These textual conventions are
   all Gauge32, and they are used because it is possible for these
   objects to decrease.  Objects may decrease when Unavailable Seconds
   occurs across a fifteen minutes interval boundary. See Unavailable
   Seconds discussion later in this section.

     Line Errored Seconds (LES)
          A Line Errored Second is a second in which one or more CV
          occurred OR one or more LOS defects.  (Also known as ES-L. See
          T1.231 section 7.4.1.2)

     P-bit Errored Seconds (PES)
          An PES is a second with one or more PCVs OR one or more Out of
          Frame defects OR a detected incoming AIS. This gauge is not
          incremented when UASs are counted.  (Also known as ESP-P. See
          T1.231 section 7.4.2.2)

     P-bit Severely Errored Seconds (PSES)
          A PSES is a second with 44 or more PCVs OR one or more Out of
          Frame defects OR a detected incoming AIS. This gauge is not
          incremented when UASs are counted.  (Also known as SESP-P. See
          T1.231 section 7.4.2.5)

     C-bit Errored Seconds (CES)
          An CES is a second with one or more CCVs OR one or more Out of
          Frame defects OR a detected incoming AIS.  This count is only
          for the SYNTRAN and C-bit Parity DS3 applications. This gauge
          is not incremented when UASs are counted. (Also known as
          ESCP-P. See T1.231 section 7.4.2.2)

     C-bit Severely Errored Seconds (CSES)
          A CSES is a second with 44 or more CCVs OR one or more Out of
          Frame defects OR a detected incoming AIS.  This count is only
          for the SYNTRAN and C-bit Parity DS3 applications.  This gauge
          is not incremented when UASs are counted. (Also known as
          SESCP-P. See T1.231 section 7.4.2.5)

     Severely Errored Framing Seconds (SEFS)
          A SEFS is a second with one or more Out of Frame defects OR a
          detected incoming AIS. This item is not incremented during
          unavailable seconds.  (Also known as SAS-P. See T1.231 section
          7.4.2.6)

Top      ToC       Page 12 
     Unavailable Seconds (UAS)
          UAS are calculated by counting the number of seconds that the
          interface is unavailable.  The DS3 interface is said to be
          unavailable from the onset of 10 contiguous PSESs, or the
          onset of the condition leading to a failure (see Failure
          States).  If the condition leading to the failure was
          immediately preceded by one or more contiguous PSESs, then the
          DS3 interface unavailability starts from the onset of these
          PSESs.  Once unavailable, and if no failure is present, the
          DS3 interface becomes available at the onset of 10 contiguous
          seconds with no PSESs.  Once unavailable, and if a failure is
          present, the DS3 interface becomes available at the onset of
          10 contiguous seconds with no PSESs, if the failure clearing
          time is less than or equal to 10 seconds.  If the failure
          clearing time is more than 10 seconds, the DS3 interface
          becomes available at the onset of 10 contiguous seconds with
          no PSESs, or the onset period leading to the successful
          clearing condition, whichever occurs later. With respect to
          the DS3 error counts, all counters are incremented while the
          DS3 interface is deemed available.  While the interface is
          deemed unavailable, the only count that is incremented is
          UASs.

          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 PES, PSES, CES, and CSES 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
          adjust the PCV, CCV, and SEFS count as necessary since these
          parameters are not accumulated during unavailable time.  It
          must be similarly prepared to retroactively decrease the UAS
          count by 10 and increase the PES, CES, PCV, and CCV 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 PCV, CCV, PES, CES,
          PSES, CSEC, SEFS, and UAS counts for the PREVIOUS interval
          must be adjusted.  In this case successive GETs of the
          affected dsx3IntervalPSESs and dsx3IntervalUASs objects will
          return differing values if the first GET occurs during the
          first few seconds of the window.

Top      ToC       Page 13 
          The agent may instead choose to delay updates to the various
          statistics by 10 seconds in order to avoid retroactive
          adjustments to the counters.  A way to do this is sketched in
          Appendix B.

          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.

          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 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 B.

2.4.3.  Performance Defects

     Failure States:
          The Remote Alarm Indication (RAI) failure, in SYNTRAN
          applications, is declared after detecting the Yellow Alarm

Top      ToC       Page 14 
          Signal on the alarm channel.  See ANSI T1.107a-1990 [9a]. The
          Remote Alarm Indication failure, in C-bit Parity DS3
          applications, is declared as soon as the presence of either
          one or two alarm signals are detected on the Far End Alarm
          Channel.  See [9].  The Remote Alarm Indication failure may
          also be declared after detecting the far-end SEF/AIS defect
          (aka yellow).  The Remote Alarm Indication failure is cleared
          as soon as the presence of the any of the above alarms are
          removed.

          Also, the incoming failure state is declared when a defect
          persists for at least 2-10 seconds.  The defects are the
          following:  Loss of Signal (LOS), an Out of Frame (OOF) or an
          incoming Alarm Indication Signal (AIS).  The Failure State is
          cleared when the defect is absent for less than or equal to 20
          seconds.

     Far End SEF/AIS defect (aka yellow)
          A Far End SEF/AIS defect is the occurrence of the two X-bits
          in a M-frame set to zero.  The Far End SEF/AIS defect is
          terminated when the two X-bits in a M-frame are set to one.
          (Also known as SASCP-PFE. See T1.231 section 7.4.4.2.6)

     Out of Frame (OOF) defect
          A DS3 OOF defect is detected when any three or more errors in
          sixteen or fewer consecutive F-bits occur within a DS3 M-
          frame.  An OOF defect may also be called a Severely Errored
          Frame (SEF) defect.  An OOF defect is cleared when reframe
          occurs.  A DS3 Loss of Frame (LOF) failure is declared when
          the DS3 OOF defect is consistent for 2 to 10 seconds.  The DS3
          OOF defect ends when reframe occurs.  The DS3 LOF failure is
          cleared when the DS3 OOF defect is absent for 10 to 20
          seconds. (See T1.231 section 7.1.2.2.1)

          An E3 OOF defect is detected when four consecutive frame
          alignment signals have been incorrectly received in there
          predicted positions in an E3 signal. E3 frame alignment occurs
          when the presence of three consecutive frame alignment signals
          have been detected.

     Loss of Signal (LOS) defect
          The DS3 LOS defect is declared upon observing 175 +/- 75
          contiguous pulse positions with no pulses of either positive
          or negative polarity.  The DS3 LOS defect is terminated upon
          observing an average pulse density of at least 33% over a
          period of 175 +/- 75 contiguous pulse positions starting with
          the receipt of a pulse. (See T1.231 section 7.1.2.1.1)

Top      ToC       Page 15 
     Alarm Indication Signal (AIS) defect
          The DS3 AIS is framed with "stuck stuffing."  This implies
          that it has a valid M-subframe alignments bits, M-frame
          alignment bits, and P bits.  The information bits are set to a
          1010... sequence, starting with a one (1) after each M-
          subframe alignment bit, M-frame alignment bit, X bit, P bit,
          and C bit.  The C bits are all set to zero giving what is
          called "stuck stuffing."  The X bits are set to one. The DS3
          AIS defect is declared after DS3 AIS is present in contiguous
          M-frames for a time equal to or greater than T, where 0.2 ms
          <= T <= 100 ms.  The DS3 AIS defect is terminated after AIS is
          absent in contiguous M-frames for a time equal to or greater
          than T.  (See T1.231 section 7.1.2.2.3)

          The E3 binary content of the AIS is nominally a continuous
          stream of ones.  AIS detection and the application of
          consequent actions, should be completed within a time limit of
          1 ms.

2.4.4.  Other Terms

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

     Proxy
          In this document, the word proxy is meant to indicate an
          application which receives SNMP messages and replies to them
          on behalf of the devices which implement the actual DS3/E3
          interfaces.  The proxy may have already collected the
          information about the DS3/E3 interfaces into its local
          database and may not necessarily forward the requests to the
          actual DS3/E3 interface.  It is expected in such an
          application that there are periods of time where the proxy is
          not communicating with the DS3/E3 interfaces.  In these
          instances the proxy will not necessarily have up-to-date
          configuration information and will most likely have missed the
          collection of some statistics data.  Missed statistics data
          collection will result in invalid data in the interval table.

3.  Object Definitions

     DS3-MIB DEFINITIONS ::= BEGIN

     IMPORTS
          MODULE-IDENTITY, OBJECT-TYPE,
          NOTIFICATION-TYPE, transmission         FROM SNMPv2-SMI

Top      ToC       Page 16 
          DisplayString, TimeStamp, TruthValue    FROM SNMPv2-TC
          MODULE-COMPLIANCE, OBJECT-GROUP,
          NOTIFICATION-GROUP                      FROM SNMPv2-CONF
          InterfaceIndex                          FROM IF-MIB
          PerfCurrentCount, PerfIntervalCount,
          PerfTotalCount                          FROM PerfHist-TC-MIB;


     ds3 MODULE-IDENTITY
         LAST-UPDATED "9808012130Z"
         ORGANIZATION "IETF Trunk MIB Working Group"
         CONTACT-INFO
           "        David Fowler

            Postal: Newbridge Networks Corporation
                    600 March Road
                    Kanata, Ontario, Canada K2K 2E6

                    Tel: +1 613 591 3600
                    Fax: +1 613 599 3667

            E-mail: davef@newbridge.com"
         DESCRIPTION
              "The is the MIB module that describes
               DS3 and E3 interfaces objects."

         ::= { transmission 30 }

     -- The DS3/E3 Near End Group

     -- The DS3/E3 Near End Group consists of four tables:
     --    DS3/E3 Configuration
     --    DS3/E3 Current
     --    DS3/E3 Interval
     --    DS3/E3 Total

     -- the DS3/E3 Configuration Table

     dsx3ConfigTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3ConfigEntry
          MAX-ACCESS  not-accessible
          STATUS  current
          DESCRIPTION
                 "The DS3/E3 Configuration table."
          ::= { ds3 5 }

     dsx3ConfigEntry OBJECT-TYPE
          SYNTAX  Dsx3ConfigEntry

Top      ToC       Page 17 
          MAX-ACCESS  not-accessible
          STATUS  current
          DESCRIPTION
                 "An entry in the DS3/E3 Configuration table."
          INDEX   { dsx3LineIndex }
          ::= { dsx3ConfigTable 1 }

     Dsx3ConfigEntry ::=
          SEQUENCE {
              dsx3LineIndex                        InterfaceIndex,
              dsx3IfIndex                          InterfaceIndex,
              dsx3TimeElapsed                      INTEGER,
              dsx3ValidIntervals                   INTEGER,
              dsx3LineType                         INTEGER,
              dsx3LineCoding                       INTEGER,
              dsx3SendCode                         INTEGER,
              dsx3CircuitIdentifier                DisplayString,
              dsx3LoopbackConfig                   INTEGER,
              dsx3LineStatus                       INTEGER,
              dsx3TransmitClockSource              INTEGER,
              dsx3InvalidIntervals                 INTEGER,
              dsx3LineLength                       INTEGER,
              dsx3LineStatusLastChange             TimeStamp,
              dsx3LineStatusChangeTrapEnable       INTEGER,
              dsx3LoopbackStatus                   INTEGER,
              dsx3Channelization                   INTEGER,
              dsx3Ds1ForRemoteLoop                 INTEGER
     }

     dsx3LineIndex OBJECT-TYPE
          SYNTAX  InterfaceIndex
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "This object should be made equal to ifIndex.  The
                 next paragraph describes its previous usage.
                 Making the object equal to ifIndex allows propoer
                 use of ifStackTable.

                 Previously, this object was the identifier of a
                 DS3/E3 Interface on a managed device.  If there is
                 an ifEntry that is directly associated with this
                 and only this DS3/E3 interface, it should have the
                 same value as ifIndex.  Otherwise, number the
                 dsx3LineIndices with an unique identifier
                 following the rules of choosing a number that is
                 greater than ifNumber and numbering the inside
                 interfaces (e.g., equipment side) with even

Top      ToC       Page 18 
                 numbers and outside interfaces (e.g, network side)
                 with odd numbers."
          ::= { dsx3ConfigEntry 1 }

     dsx3IfIndex OBJECT-TYPE
          SYNTAX  InterfaceIndex
          MAX-ACCESS  read-only
          STATUS  deprecated
          DESCRIPTION
                 "This value for this object is equal to the value
                 of ifIndex from the Interfaces table of MIB II
                 (RFC 1213)."
          ::= { dsx3ConfigEntry 2 }

     dsx3TimeElapsed OBJECT-TYPE
          SYNTAX  INTEGER (0..899)
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The number of seconds that have elapsed since the
                 beginning of the near end current error-
                 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."

          ::= { dsx3ConfigEntry 3 }

     dsx3ValidIntervals OBJECT-TYPE
          SYNTAX  INTEGER (0..96)
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The number of previous near end intervals for
                 which data was collected.  The value will be
                 96 unless the interface was brought online within
                 the last 24 hours, in which case the value will be
                 the number of complete 15 minute near end
                 intervals since the interface has been online.  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."
          ::= { dsx3ConfigEntry 4 }

     dsx3LineType OBJECT-TYPE
          SYNTAX  INTEGER {
                     dsx3other(1),

Top      ToC       Page 19 
                     dsx3M23(2),
                     dsx3SYNTRAN(3),
                     dsx3CbitParity(4),
                     dsx3ClearChannel(5),
                     e3other(6),
                     e3Framed(7),
                     e3Plcp(8)
                 }
          MAX-ACCESS  read-write
          STATUS  current
          DESCRIPTION
                 "This variable indicates the variety of DS3 C-bit
                 or E3 application implementing this interface. The
                 type of interface affects the interpretation of
                 the usage and error statistics.  The rate of DS3
                 is 44.736 Mbps and E3 is 34.368 Mbps.  The
                 dsx3ClearChannel value means that the C-bits are
                 not used except for sending/receiving AIS.
                 The values, in sequence, describe:

                 TITLE:            SPECIFICATION:
                 dsx3M23            ANSI T1.107-1988 [9]
                 dsx3SYNTRAN        ANSI T1.107-1988 [9]
                 dsx3CbitParity     ANSI T1.107a-1990 [9a]
                 dsx3ClearChannel   ANSI T1.102-1987 [8]
                 e3Framed           CCITT G.751 [12]
                 e3Plcp             ETSI T/NA(91)18 [13]."
          ::= { dsx3ConfigEntry 5 }

     dsx3LineCoding OBJECT-TYPE
          SYNTAX  INTEGER {
                     dsx3Other(1),
                     dsx3B3ZS(2),
                     e3HDB3(3)
                 }
          MAX-ACCESS  read-write
          STATUS  current
          DESCRIPTION
                 "This variable describes the variety of Zero Code
                 Suppression used on this interface, which in turn
                 affects a number of its characteristics.

                 dsx3B3ZS and e3HDB3 refer to the use of specified
                 patterns of normal bits and bipolar violations
                 which are used to replace sequences of zero bits
                 of a specified length."
          ::= { dsx3ConfigEntry 6 }

Top      ToC       Page 20 
     dsx3SendCode OBJECT-TYPE
          SYNTAX  INTEGER {
                    dsx3SendNoCode(1),
                    dsx3SendLineCode(2),
                    dsx3SendPayloadCode(3),
                    dsx3SendResetCode(4),
                    dsx3SendDS1LoopCode(5),
                    dsx3SendTestPattern(6)
                    }
          MAX-ACCESS  read-write
          STATUS  current
          DESCRIPTION
                 "This variable indicates what type of code is
                 being sent across the DS3/E3 interface by the
                 device.  (These are optional for E3 interfaces.)
                 Setting this variable causes the interface to
                 begin sending the code requested.
                 The values mean:

                    dsx3SendNoCode
                        sending looped or normal data

                    dsx3SendLineCode
                        sending a request for a line loopback

                    dsx3SendPayloadCode
                        sending a request for a payload loopback
                        (i.e., all DS1/E1s in a DS3/E3 frame)

                    dsx3SendResetCode
                        sending a loopback deactivation request

                    dsx3SendDS1LoopCode
                        requesting to loopback a particular DS1/E1
                        within a DS3/E3 frame.  The DS1/E1 is
                        indicated in dsx3Ds1ForRemoteLoop.

                    dsx3SendTestPattern
                        sending a test pattern."
          ::= { dsx3ConfigEntry 7 }

     dsx3CircuitIdentifier 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

Top      ToC       Page 21 
                 facilitating troubleshooting."
          ::= { dsx3ConfigEntry 8 }

     dsx3LoopbackConfig OBJECT-TYPE
          SYNTAX  INTEGER {
                      dsx3NoLoop(1),
                      dsx3PayloadLoop(2),
                      dsx3LineLoop(3),
                      dsx3OtherLoop(4),
                      dsx3InwardLoop(5),
                      dsx3DualLoop(6)
                    }
          MAX-ACCESS  read-write
          STATUS  current
          DESCRIPTION
               "This variable represents the desired loopback
               configuration of the DS3/E3 interface.

               The values mean:

               dsx3NoLoop
                 Not in the loopback state.  A device that is
                 not capable of performing a loopback on
                 the interface shall always return this as
                 its value.

               dsx3PayloadLoop
                 The received signal at this interface is looped
                 through the device.  Typically the received signal
                 is looped back for retransmission after it has
                 passed through the device's framing function.

               dsx3LineLoop
                 The received signal at this interface does not
                 go through the device (minimum penetration) but
                 is looped back out.

               dsx3OtherLoop
                 Loopbacks that are not defined here.

               dsx3InwardLoop
                 The sent signal at this interface is looped back
                 through the device.

               dsx3DualLoop
                 Both dsx1LineLoop and dsx1InwardLoop will be
                 active simultaneously."
          ::= { dsx3ConfigEntry 9 }

Top      ToC       Page 22 
     dsx3LineStatus OBJECT-TYPE
          SYNTAX  INTEGER (1..4095)
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "This variable indicates the Line Status of the
                 interface.  It contains loopback state information
                 and failure state information.  The dsx3LineStatus
                 is a bit map represented as a sum, therefore, it
                 can represent multiple failures and a loopback
                 (see dsx3LoopbackConfig object for the type of
                 loopback) simultaneously.  The dsx3NoAlarm must be
                 set if and only if no other flag is set.

                 If the dsx3loopbackState bit is set, the loopback
                 in effect can be determined from the
                 dsx3loopbackConfig object.
       The various bit positions are:
        1     dsx3NoAlarm         No alarm present
        2     dsx3RcvRAIFailure   Receiving Yellow/Remote
                                  Alarm Indication
        4     dsx3XmitRAIAlarm    Transmitting Yellow/Remote
                                  Alarm Indication
        8     dsx3RcvAIS          Receiving AIS failure state
       16     dsx3XmitAIS         Transmitting AIS
       32     dsx3LOF             Receiving LOF failure state
       64     dsx3LOS             Receiving LOS failure state
      128     dsx3LoopbackState   Looping the received signal
      256     dsx3RcvTestCode     Receiving a Test Pattern
      512     dsx3OtherFailure    any line status not defined
                                  here
     1024     dsx3UnavailSigState Near End in Unavailable Signal
                                  State
     2048     dsx3NetEquipOOS     Carrier Equipment Out of Service"
     ::= { dsx3ConfigEntry 10 }

dsx3TransmitClockSource OBJECT-TYPE
     SYNTAX  INTEGER {
                loopTiming(1),
                localTiming(2),
                throughTiming(3)
            }
     MAX-ACCESS  read-write
     STATUS  current
     DESCRIPTION
            "The source of Transmit Clock.

            loopTiming indicates that the recovered receive clock

Top      ToC       Page 23 
            is used as the transmit clock.

            localTiming indicates that a local clock source is used
            or that an external clock is attached to the box
            containing the interface.

            throughTiming indicates that transmit clock is derived
            from the recovered receive clock of another DS3
            interface."
          ::= { dsx3ConfigEntry 11 }

     dsx3InvalidIntervals OBJECT-TYPE
          SYNTAX  INTEGER (0..96)
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                      "The number of intervals in the range from 0 to
                 dsx3ValidIntervals 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)."
          ::= { dsx3ConfigEntry 12 }

     dsx3LineLength OBJECT-TYPE
          SYNTAX  INTEGER (0..64000)
          UNITS "meters"
          MAX-ACCESS  read-write
          STATUS  current
          DESCRIPTION
                 "The length of the ds3 line in meters.  This
                 object provides information for line build out
                 circuitry if it exists and can use this object to
                 adjust the line build out."
          ::= { dsx3ConfigEntry 13 }

     dsx3LineStatusLastChange OBJECT-TYPE
          SYNTAX  TimeStamp
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The value of MIB II's sysUpTime object at the
                 time this DS3/E3 entered its current line status
                 state.  If the current state was entered prior to
                 the last re-initialization of the proxy-agent,
                 then this object contains a zero value."
          ::= { dsx3ConfigEntry 14 }

     dsx3LineStatusChangeTrapEnable  OBJECT-TYPE

Top      ToC       Page 24 
          SYNTAX      INTEGER {
                         enabled(1),
                         disabled(2)
                      }
          MAX-ACCESS  read-write
          STATUS      current
          DESCRIPTION
                 "Indicates whether dsx3LineStatusChange traps
                 should be generated for this interface."
          DEFVAL { disabled }
          ::= { dsx3ConfigEntry 15 }

     dsx3LoopbackStatus  OBJECT-TYPE
          SYNTAX      INTEGER (1..127)
          MAX-ACCESS  read-only
          STATUS      current
          DESCRIPTION
                 "This variable represents the current state of the
                 loopback on the DS3 interface.  It contains
                 information about loopbacks established by a
                 manager and remotely from the far end.

                 The dsx3LoopbackStatus is a bit map represented as
                 a sum, therefore is can represent multiple
                 loopbacks simultaneously.

                 The various bit positions are:
                  1  dsx3NoLoopback
                  2  dsx3NearEndPayloadLoopback
                  4  dsx3NearEndLineLoopback
                  8  dsx3NearEndOtherLoopback
                 16  dsx3NearEndInwardLoopback
                 32  dsx3FarEndPayloadLoopback
                 64  dsx3FarEndLineLoopback"

     ::= { dsx3ConfigEntry 16 }

     dsx3Channelization  OBJECT-TYPE
          SYNTAX      INTEGER {
                         disabled(1),
                         enabledDs1(2),
                         enabledDs2(3)
                      }
          MAX-ACCESS  read-write
          STATUS      current
          DESCRIPTION
                 "Indicates whether this ds3/e3 is channelized or
                 unchannelized.  The value of enabledDs1 indicates

Top      ToC       Page 25 
                 that this is a DS3 channelized into DS1s.  The
                 value of enabledDs3 indicated that this is a DS3
                 channelized into DS2s.  Setting this object will
                 cause the creation or deletion of DS2 or DS1
                 entries in the ifTable.  "
     ::= { dsx3ConfigEntry 17 }

     dsx3Ds1ForRemoteLoop  OBJECT-TYPE
          SYNTAX      INTEGER (0..29)

          MAX-ACCESS  read-write
          STATUS      current
          DESCRIPTION
                 "Indicates which ds1/e1 on this ds3/e3 will be
                 indicated in the remote ds1 loopback request.  A
                 value of 0 means no DS1 will be looped.  A value
                 of 29 means all ds1s/e1s will be looped."
     ::= { dsx3ConfigEntry 18 }


     -- the DS3/E3 Current Table


     dsx3CurrentTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3CurrentEntry
          MAX-ACCESS  not-accessible
          STATUS  current
          DESCRIPTION
                 "The DS3/E3 current table contains various
                 statistics being collected for the current 15
                 minute interval."
          ::= { ds3 6 }

     dsx3CurrentEntry OBJECT-TYPE
          SYNTAX  Dsx3CurrentEntry
          MAX-ACCESS  not-accessible
          STATUS  current
          DESCRIPTION
                 "An entry in the DS3/E3 Current table."
          INDEX   { dsx3CurrentIndex }
          ::= { dsx3CurrentTable 1 }

     Dsx3CurrentEntry ::=
          SEQUENCE {
              dsx3CurrentIndex           InterfaceIndex,
              dsx3CurrentPESs            PerfCurrentCount,
              dsx3CurrentPSESs           PerfCurrentCount,
              dsx3CurrentSEFSs           PerfCurrentCount,

Top      ToC       Page 26 
              dsx3CurrentUASs            PerfCurrentCount,
              dsx3CurrentLCVs            PerfCurrentCount,
              dsx3CurrentPCVs            PerfCurrentCount,
              dsx3CurrentLESs            PerfCurrentCount,
              dsx3CurrentCCVs            PerfCurrentCount,
              dsx3CurrentCESs            PerfCurrentCount,
              dsx3CurrentCSESs           PerfCurrentCount
         }

     dsx3CurrentIndex OBJECT-TYPE
          SYNTAX  InterfaceIndex
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The index value which uniquely identifies the
                 DS3/E3 interface to which this entry is
                 applicable.  The interface identified by a
                 particular value of this index is the same
                 interface as identified by the same value an
                 dsx3LineIndex object instance."
          ::= { dsx3CurrentEntry 1 }

     dsx3CurrentPESs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The counter associated with the number of P-bit
                 Errored Seconds."
          ::= { dsx3CurrentEntry 2 }

     dsx3CurrentPSESs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The counter associated with the number of P-bit
                 Severely Errored Seconds."
          ::= { dsx3CurrentEntry 3 }

     dsx3CurrentSEFSs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The counter associated with the number of
                 Severely Errored Framing Seconds."
          ::= { dsx3CurrentEntry 4 }

Top      ToC       Page 27 
     dsx3CurrentUASs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The counter associated with the number of
                 Unavailable Seconds."
          ::= { dsx3CurrentEntry 5 }

     dsx3CurrentLCVs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The counter associated with the number of Line
                 Coding Violations."
          ::= { dsx3CurrentEntry 6 }

     dsx3CurrentPCVs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The counter associated with the number of P-bit
                 Coding Violations."
          ::= { dsx3CurrentEntry 7 }

     dsx3CurrentLESs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The number of Line Errored Seconds."
          ::= { dsx3CurrentEntry 8 }

     dsx3CurrentCCVs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The number of C-bit Coding Violations."
          ::= { dsx3CurrentEntry 9 }

     dsx3CurrentCESs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION

Top      ToC       Page 28 
                 "The number of C-bit Errored Seconds."
          ::= { dsx3CurrentEntry 10 }

     dsx3CurrentCSESs OBJECT-TYPE
          SYNTAX  PerfCurrentCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The number of C-bit Severely Errored Seconds."
          ::= { dsx3CurrentEntry 11 }

     -- the DS3/E3 Interval Table

     dsx3IntervalTable OBJECT-TYPE
          SYNTAX  SEQUENCE OF Dsx3IntervalEntry
          MAX-ACCESS  not-accessible
          STATUS  current
          DESCRIPTION
                 "The DS3/E3 Interval Table contains various
                 statistics collected by each DS3/E3 Interface over
                 the previous 24 hours of operation.  The past 24
                 hours are broken into 96 completed 15 minute
                 intervals.  Each row in this table represents one
                 such interval (identified by dsx3IntervalNumber)
                 and for one specific interface (identifed by
                 dsx3IntervalIndex)."

          ::= { ds3 7 }

     dsx3IntervalEntry OBJECT-TYPE
          SYNTAX  Dsx3IntervalEntry
          MAX-ACCESS  not-accessible
          STATUS  current
          DESCRIPTION
                 "An entry in the DS3/E3 Interval table."
          INDEX   { dsx3IntervalIndex, dsx3IntervalNumber }
          ::= { dsx3IntervalTable 1 }

     Dsx3IntervalEntry ::=
          SEQUENCE {
              dsx3IntervalIndex           InterfaceIndex,
              dsx3IntervalNumber          INTEGER,
              dsx3IntervalPESs            PerfIntervalCount,
              dsx3IntervalPSESs           PerfIntervalCount,
              dsx3IntervalSEFSs           PerfIntervalCount,
              dsx3IntervalUASs            PerfIntervalCount,
              dsx3IntervalLCVs            PerfIntervalCount,
              dsx3IntervalPCVs            PerfIntervalCount,

Top      ToC       Page 29 
              dsx3IntervalLESs            PerfIntervalCount,
              dsx3IntervalCCVs            PerfIntervalCount,
              dsx3IntervalCESs            PerfIntervalCount,
              dsx3IntervalCSESs           PerfIntervalCount,
              dsx3IntervalValidData       TruthValue
          }

     dsx3IntervalIndex OBJECT-TYPE
          SYNTAX  InterfaceIndex
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The index value which uniquely identifies the
                 DS3/E3 interface to which this entry is
                 applicable.  The interface identified by a
                 particular value of this index is the same
                 interface as identified by the same value an
                 dsx3LineIndex object instance."
          ::= { dsx3IntervalEntry 1 }

     dsx3IntervalNumber OBJECT-TYPE
          SYNTAX  INTEGER (1..96)
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "A number between 1 and 96, where 1 is the most
                 recently completed 15 minute interval and 96 is
                 the 15 minutes interval completed 23 hours and 45
                 minutes prior to interval 1."
          ::= { dsx3IntervalEntry 2 }

     dsx3IntervalPESs OBJECT-TYPE
          SYNTAX  PerfIntervalCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The counter associated with the number of P-bit
                 Errored Seconds."
          ::= { dsx3IntervalEntry 3 }

     dsx3IntervalPSESs OBJECT-TYPE
          SYNTAX  PerfIntervalCount
          MAX-ACCESS  read-only
          STATUS  current
          DESCRIPTION
                 "The counter associated with the number of P-bit
                 Severely Errored Seconds."
          ::= { dsx3IntervalEntry 4 }


Next RFC Part