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Technical Manual
Airbridge BTS3612A CDMA Base Station
Figure 2-6 Functions of all slots in the BASB
A backplane includes two parts: connector and board slot.
The connector part includes 2 input connectors of backplane +24V power/ground, and
3 DB37 D-connectors. Power input connector, D-connector are all crimped devices.
The slots of the backplane are defined as follows:
Slots 0~1 are for BCIMs.
Sots 5~6 are for BCKMs.
Slots 7~8 are for BRDMs.
Slots 2~4, 9~11 are for BCPMs.
2.6.3 External Interfaces
The interfaces between the backplane and external devices include:
System power interface
Remote maintenance serial port
Environment alarm interface
Fan alarm serial port in baseband subrack
System external synchronization interface
Sixteen E1/T1 interfaces
2.6.4 Indices
Dimensions: 368mm %262mm (Length%Width)
2.7 BESP
2.7.1 Overview
The E1 Surge Protector (BESP) is placed between the transmission equipment
subrack and the power supply subrack. It is a functional entity for the BTS to implement
Chapter 2 Baseband Subsystem
2-14
System Principle
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- Physical Structure
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