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12-1
12 Installing the Boards
Summary
This part describes:
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Board types of BTS;
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Installation and replacement methods of the BTS
boards;
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Front panel and interface of some BTS boards;
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Installation sequence of the BTS boards.
12.1 Board Types and Functions of BTS
Modules of the BTS are:
1. DSM
DSM (Data Service Module) lies in the BDS of the BTS. It implements the
trunking, data and signaling processing of Abis interface. It provides 16 E1 lines
externally. Eight are used to connect upstream BSC while other eight to connect
downstream BTS, which support the daisy chain networking mode and can also
function as E1 extension to connect upstream BSC. This board may also connect
to the transmission network to support SDH optical transmission connections.
2. CCM
CCM (Communication Control Module) is the control core for data signaling
routing, signaling processing, resources management and operation/maintenance
of the whole BDS subsystem in BSS.
3.
CHM
CHM (Channel Processing Module) conducts modulation and demodulation of
various CDMA channels and implements some power control functions.
