User Manual

AS4000 Operations and Maintenance
Section
605-0000-431
3
. Issue 1.6. Date3/2/99
Page 17 of 22 © Copyright Airspan Communications Corporation 1999
2.1.12. BER>10
-3
Message: ‘Modem Card:Poor BER’
‘ST(N):Poor BER’
Source: CT Modem in any slot form 3 to 10. or at ST.
Fault Condition: High noise level in the voice path. If a BER 10
-3
is reported and
indicates a link fail in one direction the alarm is previous information
and the information relating to fail in the other direction has been
unable to be sent back to the shelf controller.
Likely Cause: a. Poor radio path
b. Radio path blockage
Consequential Effect: a. Service is degraded and active call may be dropped.
b. Loss of communication with the ST (intermittent)
Repair Actions: Check the source of the alarm in . This will be ‘ST(N):Poor BER’
for a poor BER at the ST CRU receiver
or
‘Modem Card:Poor BER’ for a poor BER at the CT Modem card
receiver.
CT Faults
If the fault is on the one modem only change the modem card. Go
to DLP-007
If the fault indication is at the CT and there are also indications on
other modem cards at the CT
a) check the CT antenna and feeder installation
b) check for interference source close to CT.
ST Faults
If ST fault Check AGC and PC value and go to Section 5