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Statistics Displays 21-13
Token Ring-Specific Statistics
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FCS Violations
– is the number of frames received that have failed the Frame
Check Sequence (FCS) cyclic redundancy check (CRC).
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Copy Errors
– is the number of frames received with duplicate addresses.
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Trans Absences
– is the number of five half-bit time transitions. The counter is
incremented every time transitions are not detected between SDEL and EDEL
in a repeated frame.
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Frequency Errors
– is the number of frames received with signal frequency
problems.
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Frm with Aborts
– is the number of frames that were aborted in mid transmission.
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Act Mon Regen
– is the number of times the active monitor is lost and regen-
erated.
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No Return Frms
– is the number of frames that fail to return from around the ring
due to a timeout or reception of another frame.
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Underruns
– is the number of frames that were not accepted due to DMA (direct
memory access) underrun errors.
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No Buff Avail
– is the number of frames that could not be received/repeated due
to lack of buffer space.
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A/C Errors
– is the number of AMP and SMP MAC frames with AC (ARI/FCI)
equal to zero when an intervening AMP MAC frame was not received.