User's Manual

C–CCP Backplane Troubleshooting – continued
SC 4812T CDMA BTS Optimization/ATP
May 2000
6-14
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 C–CCP
Power Modules convert +27 or –48 Volts to a regulated +15, +6.5, and
+5.0 Volts to be used by the C–CCP shelf cards. In the –48 V BTS, the
LPA power modules convert –48 Volts to a regulated +27 Volts.
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 C–CCP backplane.
GLI2 Ethernet “A” and “B” Connections
These BNC connectors are located on the C–CCP backplane and routed
to the GLI2 board. This interface provides all the control and data
communications between the master GLI2 and the other GLI2, between
gateways, and for the LMF on the LAN.
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 C–CCP backplane.
CIO Connectors
 RX RF antenna path signal inputs are routed through RX Tri–Filters
(on the I/O plate), and via coaxial cables to the two MPC modules –
the six “A” (main) signals go to one MPC; the six “B” (diversity) to
the other. The MPC outputs the low–noise–amplified signals via the
C–CCP backplane to the CIO where the signals are split and sent to
the appropriate BBX2.
 A digital bus then routes the baseband signal through the BBX2, to
the backplane, then on to the MCC24 slots.
 Digital TX antenna path signals originate at the MCC24s. Each
output is routed from the MCC24 slot via the backplane appropriate
BBX2.
 TX RF path signal originates from the BBX2, through the backplane
to the CIO, through the CIO, and via multi-conductor coaxial cabling
to the LPAs in the LPA shelf.
C–CCP Backplane
Troubleshooting Procedure
Table 6-15 through Table 6-24 provide procedures for troubleshooting
problems that appear to be related to a defective C–CCP backplane. The
tables are broken down into possible problems and steps that should be
taken in an attempt to find the root cause.
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