Cabletron Systems SPECTRUM TRMMIM, User Manual

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Ring Map
3-22 Viewing Ring-level Information
Last Beacon Type
This field displays the type of beaconing frames last detected on the monitored
ring. When a beaconing condition begins, the content of the beacon frames varies
depending on the condition that caused the beaconing process. Beacon frames are
identified by a sub-vector which pinpoints the reason for the adapter’s
transmission of beacon frames. Possible beacon types are:
Signal Loss Error This beacon is transmitted by a station when it detects
signal loss from its upstream neighbor (most likely
because of a cable fault), enters monitor contention, and
monitor contention times out.
If a station detects signal loss while transmitting
streamingSignal beacons (the two following entries),
they will be changed to signalLossError beacons.
If a station detects a signal while transmitting
signalLossError beacons, they will be changed to
streamingSignalNotClaimToken (bit streaming) beacons.
Streaming Signal This beacon is transmitted by a station when a
Not Claim Token monitor contention time-out occurs in its adapter while it
is in monitor contention transmit mode, and it did not
receive any claim token MAC frames during the monitor
contention period.
Streaming Signal This beacon is transmitted by a station when monitor
Claim Token contention times out while its adapter was in monitor
contention mode (transmit or repeat), and one or more
claim token MAC frames were received during the
contention period. This indicates that monitor contention
could not be resolved within one second.
Recovery Mode Set This beacon is transmitted when the ring has begun the
recovery process.
No Beacon Frames There has been no beacon condition detected on the
Detected ring yet.
Longest Beacon
Displays the duration of the longest beaconing occurrence, in an
hours:minutes:seconds format.
Last Beacon
Displays the duration of the last beaconing occurrence, also in an
hours:minutes:seconds format.