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+-- *****************************************************************
+-- PerfHist-TC-MIB.my:  Performance History MIB file
+--
+-- May 1999, Igor Chernin
+--
+-- Copyright (c) 1999 by Cisco Systems, Inc.
+-- All rights reserved.
+-- 
+-- *****************************************************************
+--
+-- This mib was extracted from RFC 2493
+
+     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