Cisco Systems IPMUX-1E Table E-27. E1/T1 Statistics Parameters, Alarm Failure Comments

Appendix E Configuration MenusIPmux-1/1EInstallation and Operation Manual

		Table E-27. E1/T1 Statistics Parameters
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 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, O.161, G.775 and G.821 standards.
Rcv RAI	Remote	Sync LED flashes
(Yellow	Alarm	• For E1/T1, a second during which tan RAI pattern is received from the far
Alarm)	Indication
		end when the far-end framer enters a RED state (Loss of Frame)
AIS	Alarm	Sync LED is Off
	Indication	• For T1: A second during which an unframed “all 1” signal is received for
	Signal–
		3 milliseconds
	Received
	from User	• For E1: A second during which a string of 512 bits contains fewer than
		three zero (0) bits
FEBE	Far End Block	Number of seconds in which the FEBE indication is received from the remote
	Error	E1 device
		(For E1 MF-CRC4 only)

BES	Bursty Errored
	Seconds
	(Errored
	Second
	Type B)

Number of seconds with from two to 319 CRC error events with no AIS nor SEF (Framing Bit Errors) error detection

Complies with AT&T TR-62411 and TR-54016 standards Not applicable if Line Type is set to Unframed (T1-ESF or E1-CRC4 modes)

E-42 Performance Monitoring