At 06:41 AM 4/28/01 -0700, Jamal Elsaadi wrote:
aRunts, what is this variable means
See the definition below taken from Clause 30.
This is an error condition.
In a CSMA/CD network there is a window of event size that "shouldn't
happen". That is, the event is longer than a legal collision
fragment and smaller than a legal frame. If you are going to try to have
all carrier events reported in 10 Gig and use the same buckets that are
used at lower speed (so that you can use the same management) then you
gotta have it included.
Generalized nonresettable counter.This counter has a maximum increment
rate of 75 000 counts
per second at 10 Mb/s
BEHAVIOUR DEFINED AS:
Increment counter by one for each CarrierEvent that meets one of the
following two conditions.
Only one test need be made.
ActivityDuration is greater than ShortEventMaxTime and less than
ValidPacketMinTime and the CollisionEvent signal is deasserted.
OctetCount is less than 64,the ActivityDuration is greater than
ShortEventMaxTime,and the CollisionEvent signal
is deasserted. For 10 and 100 Mb/s repeaters,ValidPacketMinTime is
greater than or equal to 552 BT and less than 565 BT.A CarrierEvent
greater than or equal to 552 BT but less than 565 BT may or may not be
counted as a runt.At 10 Mb/s an event whose length is greater than 74 BT
less than 82 BT shall increment
either the aShortEvents attribute or the aRunts attribute,but not
both.ValidPacketMinTime has tolerances included to provide for circuit
losses between a
conformance test point at the AUI and the measurement point within the
For 1000 Mb/s repeaters,ValidPacketMinTime is 4136 BT.
NOTE: Runts usually indicate
collision fragments,a normal network event.
In certain situations associated with large diameter networks a
percentage of runts may exceed ValidPacketMinTime.;