     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

