User Manual

Troubleshooting: CSM Checklist
Jan 2002
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SC4812ET BTS Optimization/ATP — CDMA LMF
Problem Description
Many of the Clock Synchronization Manager (CSM) boards may be
resolved in the field before sending the boards to the factory for repair.
This section describes known CSM problems identified in field returns,
some of which are field-repairable. Check these problems before
returning suspect CSM boards.
Intermittent 19.6608 MHz
Reference Clock/GPS
Receiver Operation
If having any problems with CSM board kit numbers, SGLN1145 or
SGLN4132, check the suffix with the kit number. If the kit has version
“AB,” then replace with version ‘‘BC’’ or higher, and return model AB
to the repair center.
No GPS Reference Source
Check the CSM boards for proper hardware configuration. RF–GPS
(Local GPS) – CSM kit SGLN1145, which should be installed in Slot l,
has an on–board GPS receiver; while kit SGLN4132, in Slot 2, does not
have a GPS receiver.
Remote GPS (R–GPS) – Kit SGLN4132ED or later, which should be
installed in both Slot 1 and Slot 2, does not have a GPS receiver. Any
incorrectly configured board must be returned to the repair center. Do not
attempt to change hardware configuration in the field. Also, verify the
GPS antenna is not damaged and is installed per recommended
guidelines.
Checksum Failure
The CSM could have corrupted data in its firmware resulting in a
non-executable code. The problem is usually caused by either electrical
disturbance, or interruption of data during a download. Attempt another
download with no interruptions in the data transfer. Return CSM board
back to repair center if the attempt to reload fails.
GPS Bad RX Message Type
This is believed to be caused by a later version of CSM software (3.5 or
higher) being downloaded, via LMF, followed by an earlier version of
CSM software (3.4 or lower), being downloaded from the CBSC.
Download again with CSM software code 3.5 or higher. Return CSM
board back to repair center if attempt to reload fails.
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