User Manual

Cabinet description
Nortel Networks Confidential
1–34
PE/DCL/DD/0063
411–9001–063
Standard 12.07/EN September 2000
GSM/BSS V12
four Data Signaling Concentration boards (DSC)
two synchronization boards (SYNC)
three 48 V / ±5 V / 12A converters (one converter is optional)
one Power Sypply Command board (PSCMD)
Two CBCF boards are visible on the front panel of the CBCF module:
Compact Main Common Function (CMCF)
Compact PCMI (CPMI)
The fuse panel in the base cabinet contains three fuses:
4A–fuse to protect the BCF unit or CBCF Module
1A–fuse to protect the alarm collecting board (ALCO or RECAL)
10A–fuse to protect the user compartment
Since there is no BCF or CBCF in the extension cabinet, a filling plate occupies the
place of these units.
The fuse panel in the extension cabinet contains only two fuses: a 1A fuse for the
alarm collecting board and a 10A–fuse for the user compartment.
DRX (or e–DRX) interconnection compartment
The interconnection compartment centralizes DRX (or e–DRX) outputs. It connects
the modules to the Power Amplifiers (PA) on the one hand, and interconnects them
by means of the FH bus, on the other.
DRX (or e–DRX) compartment
The compartment receives up to eight modules.
RX–splitter compartment
The RX–splitter compartment receives up to six RX–splitters, which receive RF
signals from the LNA splitter and distribute them to the DRXs (or e–DRXs) RX
inputs.
Power system compartment
The power system compartment may be configured according to two types:
The first type is a Power Controller Unit (PCU) and up to six 600W rectifiers
(one of them redundant) which convert Mains Voltage to –48 V dc to be used in
the cabinet. According to the number of DRXs (or e–DRXs) per cell, the number
of rectifiers may be decreased.
The other type is an integrated power system including a Controller Module, a
Distribution Module and up to seven 500W rectifiers (one of them redundant).