User Manual

Troubleshooting
68P09255A57-2
Aug 2002
SC4812ET Optimization/ATP Manual Software Release R16.1.x.x
PRELIMINARY
6-10
C-CCP Backplane
The C-CCP backplane is a multi-layer board that interconnects all the
C-CCP 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:
 Determine which connector(s) is associated with a specific problem
type.
 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
GLI3 to all other GLI3s in the modem frame. Its basic function is to
provide clock synchronization from the master GLI3 to all other GLI3s
in the frame.
The ISB is also provides the following functions:
 Groom span line when a single span is used for multiple cages.
 Provide MMI connection to/from the master GLI3 to cell site modem.
 Provide interface between GLI3s 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 GLI3 in the C-CCP
shelf. The span line is used for MM/EMX switch control of the Master
GLI3 and also all the BBX traffic.
Power Input (Return A, B, and C 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 C-CCP backplane. These
include a VCC/Ground input connector, a Harting style multiple pin
interface, and a +15 V/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 C-CCP shelf cards.
GLI3 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 GLI3s in the C-CCP backplane.
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