When to look at ?
If a customer is facing issues with their pri line,calls being
disconnected,you think that their pri line is down have a look here.This
can tell a lot about the PRI line.
Below is a sample output
***** w1g1: E1 Rx Alarms (Framer) *****
ALOS: OFF | LOS: OFF
RED: OFF | AIS: OFF
LOF: OFF | RAI: OFF
***** w1g1: E1 Rx Alarms (LIU) *****
Short Circuit: OFF
Open Circuit: OFF
Loss of Signal: OFF
***** w1g1: E1 Tx Alarms *****
AIS: OFF | YEL: OFF
***** w1g1: E1 Performance Monitoring Counters *****
Line Code Violation : 330
Far End Block Errors : 4215
CRC4 Errors : 0
FAS Errors : 3
Rx Level : > -2.5db
When trying to read the output from above try to use the following rules of thumb:
1. First check the Rx Level
The correct value is -2.5db
Anything other than -2.5db indicates that there is a problem with the cable.
Rx = -44dB -> either
there is no cable plugged into the port, the cable is in very poor shape
(so replace cable), or the incorrect type of cable is
used(straight-through vs cross-over).
Rx = -2.5dB -> rx level is perfect.
Rx = [-10dB - 20dB] -> there is something on the line but very
weak. indicates a cable problem. i.e the cable length between synapse
pri port and pri modem port should not be more than 1 meter.
2. Rx Alarms : Anything if ON indicates problem.The right value should be OFF.
Rx Alarms indicated that there is something wrong on the line and have the following meanings:
RED - We are not receiving any kind of signal on the line (Usually indicates that the line is not active).
AIS - The remote end is keeping us down on purpose (eg. Line in maintenance).
RAI -The remote end is down.
Note: If the only alarm you experience is LOF & RED, try changing between CRC4 and NCRC4.
These statistics usually indicate cable issues or that the port is not plugged in at all.