rfc1232.txt

<VC++网络游戏建摸与实现>源代码

Transmission MIB Working Group                                  [Page 7]

RFC 1232                 DS1 Interface Objects                  May 1991


                  ds1CircuitIdentifier
                      DisplayString (SIZE (0..255))
          }

          ds1CSUIndex OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The index value which uniquely identifies the CSU
                      to which this entry is applicable."
              ::= { ds1ConfigEntry 1 }

          ds1Index OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "An index value that uniquely identifies an
                      interface to a ds1.  The interface identified by a
                      particular value of this index is the same
                      interface as identified by the same value an
                      ifIndex object instance."
              ::= { ds1ConfigEntry 2 }

          ds1TimeElapsed OBJECT-TYPE
              SYNTAX  INTEGER (1..900)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of seconds that have elapsed since the
                      beginning of the current error-measurement period.
                      Any fraction is rounded up."
              ::= { ds1ConfigEntry 3 }

          ds1ValidIntervals OBJECT-TYPE
              SYNTAX  INTEGER (0..96)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The number of previous intervals for which valid
                      data was collected.  The value will be 96 unless
                      the CSU device was brought online within the last
                      24 hours, in which case the value will be the
                      number of complete 15 minute intervals the CSU has
                      been online."
              ::= { ds1ConfigEntry 4 }




Transmission MIB Working Group                                  [Page 8]

RFC 1232                 DS1 Interface Objects                  May 1991


          ds1LineType OBJECT-TYPE
              SYNTAX  INTEGER {
                          other(1),
                          ds1ESF(2),
                          ds1D4(3),
                          ds1ANSI-ESF(4),
                          ds1G704(5),
                          ds1G704-CRC(6)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "This variable indicates the variety of DS1 Line
                      implementing this circuit.  The type of circuit
                      affects the number of bits per second that the
                      circuit can reasonably carry, as well as the
                      interpretation of the usage and error statistics.

                      The values, in sequence, describe:
                      TITLE:       SPECIFICATION:
                      ds1ESF        AT&T Extended SuperFrame DS1 [10]
                      ds1D4         AT&T D4 format DS1 [16], [17]
                      ds1ANSI-ESF   ANSI Extended SuperFrame format [14]
                      ds1G704       CCITT Recommendation G.704 [12]
                                      (section 2.1.3.2)
                      ds1G704-CRC   CCITT Recommendation G.704 [12]
                                      (section 2.1.3.1)
                      "
              ::= { ds1ConfigEntry 5 }

          ds1ZeroCoding OBJECT-TYPE
              SYNTAX  INTEGER {
                          ds1JammedBit(1),
                          ds1B8ZS(2),
                          ds1InvertedHDLC(3),
                          ds1HDB3(4),
                          ds1ZBTSI(5)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "This variable describes the variety of Zero Code
                      Suppression used on the link, which in turn
                      affects a number of its characteristics.

                      ds1JammedBit refers the Jammed bit Zero Encoding,
                      in which the AT&T specification of at least one
                      pulse every 8 bit periods is literally implemented



Transmission MIB Working Group                                  [Page 9]

RFC 1232                 DS1 Interface Objects                  May 1991


                      by forcing a pulse in bit 8 of each channel.
                      Thus, only seven bits per channel, or 1.344 Mbps,
                      is available for data.

                      ds1B8ZS refers to the use of a specified pattern
                      of normal bits and bipolar violations which are
                      used to replace a sequence of eight zero bits (see
                      [14]).  In this context, all eight bits in a
                      channel are technically available for data, but
                      care must be taken with D4 encoded data to avoid
                      having HDLC Flag streams imitate spurious Yellow
                      Alarm conditions.  Typically, one bit per frame is
                      ignored to force flag streams to rotate, thereby
                      avoiding this error type.  CCITT Recommendation
                      G.703 [11] may be referred to for further
                      definition of these.

                      ds1InvertedHDLC refers to the practice, common on
                      HDLC encoded DS1 data links, of inverting the data
                      between the serial interface chip and the CSU.
                      Since HDLC guarantees one zero every 6 bits in the
                      worst case, while the standards call for (in
                      effect) at least one pulse every eight, inverted
                      HDLC enjoys 4/24 one's density on the line, which
                      may improve the effective clock stability of a DS1
                      line.  As with B8ZS, all eight bits in a channel
                      are technically available for data, but care must
                      be taken with D4 encoded data to avoid having HDLC
                      Flag streams imitate spurious Yellow Alarm
                      conditions.  Typically, one bit per frame is
                      ignored to force flag streams to rotate, thereby
                      avoiding this error type.

                      ANSI Clear Channels may use ds1ZBTSI, or Zero Byte
                      Time Slot Interchange (see [14]).

                      G.704 links, with or without CRC, use ds1HDB3 (see
                      [11]).  "
              ::= { ds1ConfigEntry 6 }

          ds1Loopback OBJECT-TYPE
              SYNTAX  INTEGER {
                          ds1NoLoop(1),
                          ds1LocalLoopbackLocalSide(2),
                          ds1LocalLoopbackRemoteSide(3),
                          ds1RemoteLoopbackLocalSide(4),
                          ds1RemoteLoopbackRemoteSide(5)
                      }



Transmission MIB Working Group                                 [Page 10]

RFC 1232                 DS1 Interface Objects                  May 1991


              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "This variable represents the loopback state of
                      the CSU.  Devices supporting read/write access
                      should return badValue in response to a requested
                      loopback state that the CSU does not support.  The
                      values mean:

                      ds1NoLoop

                         Not in the loopback state.  A device that is
                         not capable of performing a loopback on either
                         interface shall always return this as it's
                         value.

                      ds1LocalLoopbackLocalSide

                         Signal received from the local side of the
                         device is looped back at the local connector
                         (eg, without involving the CSU).

                      ds1LocalLoopbackRemoteSide

                         Signal received from the local side of the
                         device is looped back at the remote connector
                         (eg, through the CSU).

                      ds1RemoteLoopbackLocalSide

                         Signal received from the remote side of the
                         device is looped back at the local connector
                         (eg, through the CSU).

                      ds1RemoteLoopbackRemoteSide

                         Signal received from the remote side of the
                         device is looped back at the remote connector
                         (eg, without involving the CSU)."
              ::= { ds1ConfigEntry 7 }

          ds1SendCode OBJECT-TYPE
              SYNTAX  INTEGER {
                          ds1OtherTest(1),
                          ds1SendNoCode(2),
                          ds1SendSetCode(3),
                          ds1SendResetCode(4),
                          ds1SendQRSS(5)



Transmission MIB Working Group                                 [Page 11]

RFC 1232                 DS1 Interface Objects                  May 1991


                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                 "This variable indicates what type of code is
                 being sent across the DS1 circuit by the CSU.  The
                 values mean:

                 ds1SendNoCode    sending looped or normal data
                 ds1SendSetCode   sending a loopback request
                 ds1SendResetCode sending a loopback termination request
                 ds1SendQRSS      sending the BERT pattern described in
                                  ANSI T1.403-1989 section 5.6
                 ds1OtherTest     sending a different BERT/BLERT pattern,
                                  such as all zeroes, all ones, etc."
              ::= { ds1ConfigEntry 8 }

          ds1YellowAlarm OBJECT-TYPE
              SYNTAX  INTEGER {
                          ds1NoYellowAlarm (1),
                          ds1YellowAlarm (2)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "This variable indicates if a Yellow Alarm
                      condition exists.

                      Note that G.704 interfaces do not support Yellow
                      Alarms.  Accordingly, such agents should return
                      the value ds1NoYellowAlarm."
              ::= { ds1ConfigEntry 9 }

          ds1RedAlarm OBJECT-TYPE
              SYNTAX  INTEGER {
                          ds1NoRedAlarm (1),
                          ds1RedAlarm (2)
                      }
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "This variable indicates if a Red Alarm condition
                      exists.

                      Note that G.704 interfaces do not support Red
                      Alarms.  Accordingly, such agents should return
                      the value ds1NoRedAlarm."
              ::= { ds1ConfigEntry 10 }



Transmission MIB Working Group                                 [Page 12]

RFC 1232                 DS1 Interface Objects                  May 1991


          ds1CircuitIdentifier OBJECT-TYPE
              SYNTAX  DisplayString (SIZE (0..255))
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "This variable contains the transmission vendor's
                      circuit identifier, for the purpose of
                      facilitating troubleshooting."
              ::= { ds1ConfigEntry 11 }


          -- the DS1 Interval group

          -- Implementation of this group is mandatory for all systems
          -- that attach to a ds1.

          -- It is recognized that some currently deployed CSUs do not
          -- record the entire set of statistics specified in this
          -- group.  Accordingly, some agents queried for these objects
          -- may treat these objects as having an ACCESS clause value
          -- of not-accessible.

          -- The DS1 Interval Table contains various statistics
          -- collected by each CSU over the previous 24 hours of
          -- operation.  The past 24 hours are broken into 96 completed
          -- 15 minute intervals.

          ds1IntervalTable OBJECT-TYPE
              SYNTAX  SEQUENCE OF DS1IntervalEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "The DS1 Interval table."
              ::= { ds1 2 }

          ds1IntervalEntry OBJECT-TYPE
              SYNTAX  DS1IntervalEntry
              ACCESS  not-accessible
              STATUS  mandatory
              DESCRIPTION
                      "An entry in the DS1 Interval table."
              INDEX   { ds1IntervalIndex, ds1IntervalNumber }
              ::= { ds1IntervalTable 1 }

          DS1IntervalEntry ::=
              SEQUENCE {
                  ds1IntervalIndex
                      INTEGER,



Transmission MIB Working Group                                 [Page 13]

RFC 1232                 DS1 Interface Objects                  May 1991


                  ds1IntervalNumber
                      INTEGER (1..96),
                  ds1IntervalESs
                      Counter,
                  ds1IntervalSESs
                      Counter,
                  ds1IntervalSEFSs
                      Counter,
                  ds1IntervalUASs
                      Counter,
                  ds1IntervalCSSs
                      Counter,
                  ds1IntervalBPVs
                      Counter,
                  ds1IntervalCVs
                      Counter
              }

          ds1IntervalIndex OBJECT-TYPE
              SYNTAX  INTEGER
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The index value which uniquely identifies the CSU
                      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 ds1CSUIndex object instance."
              ::= { ds1IntervalEntry 1 }

          ds1IntervalNumber OBJECT-TYPE
              SYNTAX  INTEGER (1..96)
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "A number between 1 and 96, where 1 is the most
                      recently completed 15 minute interval and 96 is
                      the least recently completed 15 minute interval
                      (assuming that all 96 intervals are valid)."
              ::= { ds1IntervalEntry 2 }

          ds1IntervalESs OBJECT-TYPE
              SYNTAX  Counter
              ACCESS  read-only
              STATUS  mandatory
              DESCRIPTION
                      "The counter associated with the number of Errored
                      Seconds, as defined by ANSI Draft Standard



Transmission MIB Working Group                                 [Page 14]