Monitor Port Info
ATX MIB Reference Guide
7-11
rptrMonitorPortRunts
{rptrMonitorPortEntry 9}
Counter Read-Only
This counter is incremented by one for each CarrierEvent on this port that meets
one of the following two conditions. Only one test need be made. a) The
ActivityDuration is greater than ShortEventMaxTime and less than
ValidPacketMinTime and the CollisionEvent signal is deasserted. b) The
OctetCount is less than 64, the ActivityDuration is greater than
ShortEventMaxTime and the CollisionEvent signal is deasserted.
ValidPacketMinTime is greater than or equal to 552 bit times and less than 565
bit times. An event whose length is greater than 74 bit times but less than 82 bit
times shall increment either the shortEvents counter or the runts counter but not
both. A CarrierEvent greater than or equal to 552 bit times but less than 565 bit
times may or may not be counted as a runt. ValidPacketMinTime has tolerances
included to provide for circuit losses between a conformance test point at the AUI
and the measurement point within the state machine. Runts usually indicate
collision fragments, a normal network event. In certain situations associated with
large diameter networks a percentage of runts may exceed ValidPacketMinTime.
The approximate minimum time for rollover of this counter is 16 hours.
rptrMonitorPortCollisions
{rptrMonitorPortEntry 10}
Counter Read-Only
This counter is incremented by one for any CarrierEvent on any port for which
the CollisionEvent Signal on this port is asserted. The approximate minimum
time for rollover of this counter is 16 hours.
rptrMonitorPortLateEvents
{rptrMonitorPortEntry 11}
Counter Read-Only
This counter is incremented by one for each CarrierEvent on this port in which
the Collin (X) variable transitions to the value SQE (Ref 9.6.6.2, IEEE 802.3 Std)
while the ActivityDuration is greater than the LateEventThreshold. Such a
CarrierEvent is counted twice, as both a collision and as a lateEvent. The
LateEventTheshold is greater than 480 bit times and less than 565 bit times.
LateEventThreshold has tolerances included to permit an implementation to
build a single threshold to serve as both the LateEventThreshold and
ValidPacketMinTime threshold. The approximate minimum time for rollover of
this counter is 81 hours.
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Страница 62: ...Chapter 4 Token Ring MIB 4 8 ATX MIB Reference Guide ...
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