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

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