Enterasys Networks MicroMMAC-T - Manual (Page 73)

Management Station Statistics 3-17
Token Ring Statistics
A.C. Errors
The count detected by the management station of frames (Protocol Data Units or
PDUs) containing errors in the A or C bits.
Abort Sequences
The management station’s count of abort sequences detected on the ring, which
were issued by ring stations during transmission.
Internal Errors
The number of recoverable internal errors detected by the management station,
indicating a ring station in marginal operating condition.
Lost Frames
The number of frames detected by the management station that were transmitted
on the ring, but did not return to the transmitting station because the Timer
Return to Repeat (TRR) timer expired.
Congestion Errors
The number of times the management station has not been able to copy a PDU
addressed to it because of a lack of internal buffering.
FC Errors
The management station’s count of PDU detected on the ring with the A bits
already set to 1, which indicates a possible electrical line disturbance, or a
duplicate address on the ring.
Token Errors
The number of times the ring’s active monitor detected an error that required the
transmission of a token.
Frequency Errors
The number of times that the management station has detected that the incoming
frequency differs from the expected frequency by more than allowed.
Soft Errors
The total number of soft errors the management station has detected.
Hard Errors Fields
If a particular type of hard error is detected by the management station,
“Detected” will be displayed in the appropriate hard error field. If no hard errors
are detected, the field will display “None.”
Signals Lost
These errors occur if the management station has detected a loss of signal
condition, which can be the result of a broken ring, a faulty wiring concentrator,
or a receiver or transmitter malfunction.