User's Manual

Troubleshooting: SCCP Backplane68P09255A69-3

Aug 2002

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

PRELIMINARY

6-21

CIO Connectors

 RF RX antenna path signal inputs are routed through RX paths of the

DRDCs or TRDCs at the RF interface panel (rear of frame), and

through coaxial cables to the two MPC modules. The three “A” (main)

signals go to one MPC; the three “B” (diversity) to the other. The

MPC outputs the low-noise-amplified signals through the SCCP

backplane to the CIO where the signals are split and sent to the

appropriate BBX.

 A digital bus then routes the baseband signal through the BBX, to the

backplane, and then on to the MCC slots.

 Digital TX antenna path signals originate at the MCCs. Each output is

routed from the MCC slot through the backplane to the appropriate

BBX.

 TX RF path signal originates from the BBX, travels through the

backplane to the CIO, through the CIO, and then through

multi-conductor coaxial cabling to the trunking module and LPAs in

the LPA shelf.

SCCP Backplane Troubleshooting Procedure

The following tables provide standard procedures for troubleshooting

problems that appear to be related to a defective SCCP backplane. The

tables are broken down into possible problems and steps which should

be taken in an attempt to find the root cause.

NOTE

All steps in all tables should be followed before any attempt to

replace the SCCP backplane.