PerfHist-TC-MIB DEFINITIONS ::= BEGIN

     IMPORTS
        MODULE-IDENTITY,
        Gauge32, mib-2
            FROM SNMPv2-SMI
        TEXTUAL-CONVENTION
            FROM SNMPv2-TC;

     perfHistTCMIB MODULE-IDENTITY
          LAST-UPDATED "9811071100Z"
          ORGANIZATION "IETF AToMMIB and TrunkMIB WGs"
          CONTACT-INFO
                       "Kaj Tesink
              Postal:  Bellcore
                       331 Newman Springs Road
                       Red Bank, NJ 07701
                       USA
              Tel:     +1 732 758 5254
              Fax:     +1 732 758 2269
              E-mail:  kaj@bellcore.com"
          DESCRIPTION
           "This MIB Module provides Textual Conventions
             to be used by systems supporting 15 minute
             based performance history counts."
          ::= { mib-2 58 }

     -- The Textual Conventions defined below are organized
     -- alphabetically

     -- Use of these TCs assumes the following:
     -- 0  The agent supports 15 minute based history
     --    counters.
     -- 0  The agent is capable of keeping a history of n
     --    intervals of 15 minute performance data. The
     --    value of n is defined by the specific MIB
     --    module but shall be 0 < n =< 96.
     -- 0  The agent may optionally support performance
     --    data aggregating the history intervals.
     -- 0  The agent will keep separate tables for the
     --    current interval, the history intervals, and
     --    the total aggregates.
     -- 0  The agent will keep the following objects.
     --    If performance data is kept for multiple instances
     --    of a measured entity, then
     --    these objects are applied to each instance of
     --    the measured entity (e.g., interfaces).
     --

     -- xyzTimeElapsed 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 current measurement period.
     --       If, for some reason, such as an adjustment in the
     --       system's time-of-day clock, the current interval
     --       exceeds the maximum value, the agent will return
     --       the maximum value."
     --       ::= { xxx }

     -- xyzValidIntervals OBJECT-TYPE
     --       SYNTAX  INTEGER (0..<n>)
     --       MAX-ACCESS  read-only
     --       STATUS  current
     --       DESCRIPTION
     --       "The number of previous near end intervals
     --       for which data was collected.
     --          [ The overall constraint on <n> is 1 =< n =< 96; ]
     --          [ Define any additional constraints on <n> here. ]
     --       The value will be <n> unless the measurement was
     --       (re-)started within the last (<n>*15) minutes, in which
     --       case the value will be the number of complete 15
     --       minute intervals for which the agent has at least
     --       some data. In certain cases (e.g., in the case
     --       where the agent is a proxy) it is possible that some
     --       intervals are unavailable.  In this case, this
     --       interval is the maximum interval number for
     --       which data is available."
     --       ::= { xxx }

     -- xyzInvalidIntervals OBJECT-TYPE
     --     SYNTAX  INTEGER (0..<n>)
     --     MAX-ACCESS  read-only
     --     STATUS  current
     --     DESCRIPTION
     --       "The number of intervals in the range from
     --        0 to xyzValidIntervals 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)."
     --       ::= { xxx }

     PerfCurrentCount ::= TEXTUAL-CONVENTION
           STATUS  current
           DESCRIPTION
              "A counter associated with a
               performance measurement in a current 15
               minute measurement interval. The value
               of this counter starts from zero and is
               increased when associated events occur,
               until the end of the 15 minute interval.
               At that time the value of the counter is
               stored in the first 15 minute history
               interval, and the CurrentCount is
               restarted at zero. In the
               case where the agent has no valid data
               available for the current interval the
               corresponding object instance is not
               available and upon a retrieval request
               a corresponding error message shall be
               returned to indicate that this instance
               does not exist (for example, a noSuchName
               error for SNMPv1 and a noSuchInstance for
               SNMPv2 GET operation)."
            SYNTAX  Gauge32

     PerfIntervalCount ::= TEXTUAL-CONVENTION
           STATUS  current
           DESCRIPTION
              "A counter associated with a
               performance measurement in a previous
               15 minute measurement interval. In the
               case where the agent has no valid data
               available for a particular interval the
               corresponding object instance is not
               available and upon a retrieval request
               a corresponding error message shall be
               returned to indicate that this instance
               does not exist (for example, a noSuchName
               error for SNMPv1 and a noSuchInstance for
               SNMPv2 GET operation).
               In a system supporting
               a history of n intervals with
               IntervalCount(1) and IntervalCount(n) the
               most and least recent intervals
               respectively, the following applies at
               the end of a 15 minute interval:
               - discard the value of IntervalCount(n)
               - the value of IntervalCount(i) becomes that
                 of IntervalCount(i-1) for n >= i > 1
               - the value of IntervalCount(1) becomes that
                 of CurrentCount
               - the TotalCount, if supported, is adjusted."
            SYNTAX  Gauge32

     PerfTotalCount ::= TEXTUAL-CONVENTION
           STATUS  current
           DESCRIPTION
              "A counter associated with a
               performance measurements aggregating the
               previous valid 15 minute measurement
               intervals. (Intervals for which no valid
               data was available are not counted)"
            SYNTAX  Gauge32

END
