Product Info

Troubleshooting
DN9913495 © Nokia Corporation Draft 25 (52)
Issue 3-0 en Nokia Proprietary and Confidential
No transmission
connection to the BSC
(yellow or red LED on
transmission unit).
1. Abis cable not
connected or connected
incorrectly.
1. Check that the cable is
connected on the
transmission unit and at
the BSC. Check that the
RX and TX cables are
connected to the correct
connectors.
2. Abis cable broken. 2. Replace the cable.
3. Line interface broken. 3. Connect a jumper cable
from the TX connector of
each transmission
interface to its RX
connector. If the green
LED is lit the line interface
is OK. Otherwise, change
the transmission unit.
4. Transmission unit
broken
4. Replace the
transmission unit.
Transmission connection
works but there is a yellow
LED lit on the
transmission unit.
No real time connection
from the network to the
transmission unit.
Establish the BSC
connection.
The device status report
in the BTS Manager
indicates that the BCCH
TRX and a slave TRX are
in the ‘Supervisory’ state,
but the yellow LED blinks
on both TRXs.
Objects are locked from
the BSC/NMS.
Request the state from the
BSC/NMS. Request an
unlock from the BSC/NMS
if necessary.
Table 2. Troubleshooting checklist (Continued)
Symptom Possible fault Action