User's Manual

SCCP Backplane Troubleshooting
PRELIMINARY
SC 4812ETL BTS Optimization/ATP
08/15/2000
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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.
Primary “A” and Redundant “B” ISB (Inter Shelf Bus)
connectors
The 40 pin ISB connectors provide an interface bus from the master
GLI2 to all other GLI2s in the modem frame. Its basic function is to
provide clock synchronization from the master GLI2 to all other GLI2s
in the frame.
The ISB is also provides the following functions:
S Span line grooming when a single span is used for multiple cages
S Provide MMI connection to/from the master GLI2 to cell site modem
S Provide interface between GLI2s and the AMR (for reporting BTS
alarms)
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.
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