Asante Technologies 9000 manual Very Long Events, Mismatches, Auto Partitions

802.3Std) while the ActivityDuration is greater than the LateEventThreshold. Such a CarrierEvent is counted twice, as both a collision and as a lateEvent.

The LateEventThreshold 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."

Reference: IEEE 802.3 Rptr Mgt, 19.2.6.2, aLateEvents

Very Long Events

"This counter is incremented by one for each CarrierEvent on this port whose ActivityDuration is greater than the MAU Jabber Lockup Protection timer TW3 (Ref: 9.6.1 & 9.6.5, IEEE 802.3 Std).

Other counters may be incremented as appropriate." Reference: IEEE 802.3 Rptr Mgt, 19.2.6.2, aVeryLongEvents

D.R. Mismatches

"This counter is incremented by one for each frame received on this port that meets all of the following conditions:

a)The CollisionEvent signal is not asserted.

b)The ActivityDuration is greater than ValidPacketMinTime.

c)The frequency (data rate) is detectably mismatched from the local transmit frequency.

The exact degree of mismatch is vendor specific and is to be defined by the vendor for conformance testing.

When this event occurs, other counters whose increment conditions were satisfied may or may not also be incremented, at the implementor's discretion. Whether or not the repeater was able to maintain data integrity is beyond the scope of this standard."

Reference: IEEE 802.3 Rptr Mgt, 19.2.6.2, aDataRateMismatches

Auto Partitions

"This counter is incremented by one for each time the repeater has automatically partitioned this port. The conditions that cause port partitioning are specified in the partition state machine in Section 9 [IEEE 802.3 Std]. They are not differentiated here."

Page B-4