User's Manual

Troubleshooting: CSM Check-list

68P09255A69-3

Aug 2002

1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x

PRELIMINARY

6-18

Troubleshooting: CSM Check-list

Problem Description

Many Clock Synchronization Manager (CSM) board problems 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

Correct Hardware

Check the CSM boards for proper hardware configuration for the type of

GPS in use and the cage slot where they are installed.

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 (RGPS) - 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.

RGPS Expansion Cabling

20-pair Punchblock Connections - For companion frame installations

with RGPS, verify the 20-pair punchblock RGPS distribution

connections in the RGPS expansion primary frame are correctly punched

down in accordance with Table 3-9.

50-pair Punchblock Connections - For companion frame installations

with RGPS, verify the 50-pair punchblock RGPS distribution

connections in both the RGPS expansion primary and secondary frames

are correctly punched down in accordance with Table 3-7 and Table 3-8.

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.