Cabletron Systems 1800 - Manual (Page 339)

St atistics Displays 21-13
Token Ring-Specific Statistics
● FCS Violations – is the number of frames received that have failed the Frame
Check Sequence (FCS) cyclic redundancy check (CRC).
● Copy Errors – is the number of frames received with duplicate addresses.
● 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.
● Frequency Errors – is the number of frames received with signal frequency
problems.
● Frm with Aborts – is the number of frames that were aborted in mid transmission.
● Act Mon Regen – is the number of times the active monitor is lost and regen-
erated.
● 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.
● Underruns – is the number of frames that were not accepted due to DMA (direct
memory access) underrun errors.
● No Buff Avail – is the number of frames that could not be received/repeated due
to lack of buffer space.
● 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.