RAD Data comm IPmux-16 operation manual E1/T1 Alarms and Statistics, Alarm Failure Comments

Chapter 3 OperationIPmux-16Installation and Operation Manual

Table 3-3. E1/T1 Alarms and Statistics

Alarm	Failure	Comments
LOS	Loss of Signal	Sync LED Off.
		• For T1: A second during which 192 contiguous pulse positions have no
		pulse of either positive or negative polarity (signal is more than 30 dB
		below nominal amplitude.
		• For E1: A second during which 255 contiguous pulse positions have no
		pulse of either positive or negative polarity.
LOF	Loss of Frame	Sync LED off.
		• For E1/T1: A second during which an OOF (see below) error persists for
		2.5 seconds and no AIS error (see below) is detected.
LCV	Line Code	• Line Code Violation
	Violation	For T1: A second during which BPV (Bipolar Violation) or EXZ errors have
		occurred.
		• For E1: A second during which two consecutive BPVs of the same
		polarity are received.
		• BPV is the occurrence of a pulse with the same polarity as the previous
		pulse.
		• EXZ is the occurrence of a zero string greater than 15 for AMI or 7 for
		B8ZS.
		• Complies with ITU-TI.431, 0.161, G.775 and G.821 standards.
Rcv RAI	Remote	The Sync LED flashes.
(Yellow	Alarm	• For E1/T1, a second during which an RAI pattern is received from the far
Alarm)	Indication
		end when the far-end framer enters a RED state (Loss of Frame).

AIS	Alarm
	Indication
	Signal–
	Received
	from User

The Sync LED is off.

•For T1: A second during which an unframed “all 1” signal is received for 3 milliseconds.

•For E1: A second during which a string of 512 bits contains fewer than three zero (0) bits.

3-40 Configuring IPmux-16