Description: 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.