Alarm Conﬁguration

The Alarm Type list displays the variables available for alarms, the current status of each alarm, and the current threshold setting. To change the status or threshold for an alarm, you must ﬁrst select it in this list. You can set an alarm threshold for the following variables:

Ring Purges	The number of times the active monitor has purged the
	ring since the network was created, or since the
	TRMMIM was last reset. This includes the purge at the
	end of the active monitor selection process; however, the
	count is not reset when the active monitor changes.
Active Monitor	The number of times a duplicate active monitor has been
Participant	detected on the ring. When any station which considers
Errors	itself to be the active monitor receives a ring purge or
	AMP (active monitor present) frame that it did not
	transmit, it will become a standby monitor. If this process
	leaves the ring without an active monitor (because both
	active monitors have switched to standby mode), the
	monitor contention process will begin.
Token Errors	The number of times the active monitor either does not
	see a token circulating on the ring before its TVX (Timer,
	Valid Transmission) timer expires (e.g., a Lost Frame
	error has occurred), or sees a recirculating frame or
	token. Each time a token error is noted, the active
	monitor purges the ring and issues a new token.
Claim Token	The number of times a claim token has been released by a
Errors	station on the ring. A claim token is released when a
	station detects that the active monitor is missing or
	malfunctioning, or following a beaconing condition; the
	issuing of a claim token initiates the monitor contention
	process, through which a new active monitor will be
	chosen.
Lost Frames	The number of times a station’s TRR (Timer, Return to
	Repeat) timer expires before the frame it is transmitting
	returns. This timer, which is set to 4.1 milliseconds,
	ensures that each station returns to the data repeat state
	after transmitting: retrieves its token, strips it of data,
	and issues a new token. Lost frame errors will cause the
	active monitor to initiate the ring purge process and issue
	a new token; these errors are usually caused by stations
	entering or leaving the ring while a frame is circulating
	(since stations entering or leaving brieﬂy throw the ring
	out of sync).
Frame Count	The number of frames detected on the ring.

4-4	Setting and Viewing Ring Alarms