User's Manual

Troubleshooting: SCCP Backplane

68P09255A69-3

Aug 2002

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

PRELIMINARY

6-20

Troubleshooting: SCCP Backplane

Introduction

The SCCP backplane is a multi-layer printed circuit board that

interconnects all the SCCP modules. The complexity of this board lends

itself to possible improper diagnoses when problems occur.

Connector Functionality

The following connector overview describes the major types of

backplane connectors along with the functionality of each. This will

assist the CFE to:

 Determine which connector(s) is associated with a specific problem

type.

 Isolate problems to a specific cable or connector.

Span Line Connector

The span line input is an 8 pin RJ-45 connector that provides a primary

and secondary (if used) span line interface to each GLI in the SCCP

shelf. The span line is used for MM/EMX switch control of the Master

GLI and also all the BBX traffic.

Power Input (Return A and B connectors)

Provides 27 volt input for use by the power supply modules.

Power Supply Module Interface

Each power supply module has a series of three different connectors to

provide the needed inputs/outputs to the SCCP backplane. These include

a VCC/Ground input connector, a Harting-style multiple pin interface,

and a +15V/Analog Ground output connector. The Transceiver Power

Module converts 27/48 Volts to a regulated +15, +6.5, +5.0 volts to be

used by the SCCP shelf cards.

GLI Connector

This connector consists of a Harting 4SU digital connector and a

6-conductor coaxial connector for RDM distribution. The connectors

provide inputs/outputs for the GLIs in the SCCP backplane.

GLI Ethernet “A” and “B” Connections

These SMB connectors are located on the SCCP backplane and connect

to the GLI board. This interface provides all the control and data

communications over the Ethernet LAN between the master GLI, the

redundant GLI, and the LMF.

BBX Connector

Each BBX connector consists of a Harting 2SU/1SU digital connector

and two 6-conductor coaxial connectors. These connectors provide DC,

digital, and RF inputs/outputs for the BBXs in the SCCP backplane.