ADTRAN TSU 120e user manual Table B-1. Alarm Conditions, Felp, Oof

Appendix B. Understanding TR-08

Table B-1explains what conditions trigger alarms and how alarms are processed when received by the TSU 120.

	Table B-1.Alarm Conditions
Name	Explanation
FELP	When the TSU 120 receives a FELP alarm, it will loop
	the incoming data directly to the outgoing data. LINE
	ON is placed in history. The alarms and loopback are
	cleared when FELP is no longer received.
Loss of Data	The TSU 120 will send MINOR ALARM and the A
	SHELF ALARM for 2.5s when it quits receiving the
	data link on the T-Span. It will also report TR-08 DL
	Down in the history. After 2.5s, MAJOR ALARM, A
	SHELF ALARM are sent across the Data Link.
OOF	The TSU will send MINOR ALARM and A SHELF
	ALARM upon receiving an out-of-frame condition.
	TR-08 DL Down and RED ALARM are declared in
	history for severe framing errors. After 2.5s, MAJOR
	ALARM, A SHELF ALARM are sent across the Data
	Link.
Loss of Signal	The TSU 120 will send MINOR ALARM and the A
	SHELF ALARM for 2.5s when it quits receiving a
	signal from the far end. It will also report TR-08 DL
	Down and LOS in the history. After 2.5s, MAJOR
	ALARM, A SHELF ALARM are sent across the Data
	Link, and RED ALARM is declared in history.
BPVs	BPVs that are received at a rate greater than the
	threshold set under TR-08options, will cause
	MINOR ALARM and A SHELF ALARM to be sent
	on the DL. If the BPVs remain above the threshold for
	2.5s, the TSU 120 will send MAJOR ALARM on the
	DL. No events are placed in history.
Protection	The TSU will not respond to this alarm.
Line Switch

B-2 TSU 120 User Manual 612020129L1-1