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Reference: IEEE 802.3 Rptr Mgt, 19.2.6.2, aFrameCheckSequenceErrors
Alignment Errors
"This counter is incremented by one for each frame received on this port with
the FCSError and FramingError signals asserted and CollisionEvent signal
deasserted and whose OctetCount is greater than or equal to minFrameSize
and less than or equal to maxFrameSize (Ref: IEEE 802.3 Std, 4.4.2.1). If
rptrMonitorPortAlignmentErrors is incremented then the
rptrMonitorPortFCSErrors Counter shall not be incremented for the same
frame.
The approximate minimum time for rollover of this counter is 80 hours."
Reference: IEEE 802.3 Rptr Mgt, 19.2.6.2, aAlignmentErrors
Frame Too Longs
"This counter is incremented by one for each frame received on this port
whose OctetCount is greater than maxFrameSize (Ref: 4.4.2.1, IEEE 802.3
Std). If rptrMonitorPortFrameTooLongs is incremented then neither the
rptrMonitorPortAlignmentErrors nor the rptrMonitorPortFCSErrors counter
shall be incremented for the frame.
The approximate minimum time for rollover of this counter is 61 days."
Reference: IEEE 802.3 Rptr Mgt, 19.2.6.2, aFramesTooLong
Short Events
"This counter is incremented by one for each CarrierEvent on this port with
ActivityDuration less than ShortEventMaxTime. ShortEventMaxTime is
greater than 74 bit times and less than 82 bit times. ShortEventMaxTime has
tolerances included to provide for circuit losses between a conformance test
point at the AUI and the measurement point within the state machine.
Note: shortEvents may indicate externally generated noise hits which will
cause the repeater to transmit Runts to its other ports, or propagate a collision
(which may be late) back to the transmitting DTE and damaged frames to the
rest of the network.
Implementors may wish to consider selecting the ShortEventMaxTime
towards the lower end of the allowed tolerance range to accommodate bit
GLXY9.book Page 2 Thursday, February 17, 2000 3:04 PM