Enterasys NetSight Element Manager, User Manual

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Port Level Statistics 3-21
Token Ring Statistics
The Station Statistics Window Soft Error Fields
The following fields break down soft errors for the selected station.
Line Errors
The count of line errors detected by the selected station port. This error indicates a
non-data bit between the starting and ending delimiters of data, or a frame check
sequence error.
Burst Errors
The count of burst errors detected by the selected station port. This error indicates
a bit information-encoding error when there are no transitions between 0 and 1
over five half-bit times.
A.C. Errors
The number of Protocol Data Units (PDUs) containing errors in the A or C bits
detected by the selected station port.
Abort Sequences
The number of times the selected port has transmitted abort sequences during
transmission.
Internal Errors
The number of recoverable internal errors detected by the selected port,
indicating that its attached station is in marginal operating condition.
Lost Frames
The number of frames that the selected port has transmitted that have not
returned because the Timer Return to Repeat (TRR) timer has expired.
Congestion Errors
The number of times the selected port has not been able to copy a PDU addressed
to it because of a lack of internal buffering.
F.C. Errors
The number of PDU addressed to the selected station that have 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 selected station, while acting as the active monitor, has
detected an error that required the transmission of a token.