User's Manual

SCCP Backplane Troubleshooting
PRELIMINARY
1X SCt4812ET Lite BTS Optimization/ATP
08/01/2001
6-20
Introduction
The SCCP backplane is a multi–layer 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
allow the Cellular Field Engineer (CFE) to:
S Determine which connector(s) is associated with a specific problem
type.
S Allow the isolation of 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 GLI2 in the SCCP
shelf. The span line is used for MM/EMX switch control of the Master
GLI2 and also all the BBX2 traffic.
Power Input (Return A and B connectors)
Provides a 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.
GLI2 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 GLI2s in the SCCP backplane.
GLI2 Ethernet “A” and “B” Connections
These SMB connectors are located on the SCCP backplane and connect
to the GLI2 board. This interface provides all the control and data
communications over the Ethernet LAN between the master GLI2, the
other GLI2, and the LMF.
BBX2 Connector
Each BBX2 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 BBX2s in the SCCP backplane.
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