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User Manual
Airbridge cBTS3612 CDMA Base Station
2.3.3 BTS High Power Amplifier Module (BHPA) ..................................................... 2-28
2.3.4 BTS Transceiver Backplane Module (BTBM) .................................................. 2-30
2.3.5 Combining Duplexer Unit (CDU)..................................................................... 2-31
2.3.6 Duplexer Filter Unit (DFU) ............................................................................. 2-33
2.3.7 Dual Duplexer Unit (DDU).............................................................................. 2-35
2.3.8 Receive LNA Distribution Unit (RLDU)............................................................ 2-37
2.3.9 BTS RF Fan Module (BRFM) ......................................................................... 2-39
2.4 Antenna & Feeder Subsystem ................................................................................. 2-43
2.4.1 Overview....................................................................................................... 2-43
2.4.2 RF Antenna & Feeder.................................................................................... 2-43
2.4.3 Dual-Satellite Synchronization Antenna & Feeder ........................................... 2-47
2.5 Power Supply Subsystem ........................................................................................ 2-50
2.5.1 Overview....................................................................................................... 2-50
2.5.2 General Structure .......................................................................................... 2-51
2.5.3 Technical Indices .......................................................................................... 2-51
2.5.4 Power Supply Monitoring ............................................................................... 2-54
2.5.5 BTS Direct Current Switchbox (BDCS) ........................................................... 2-55
2.6 Environment Monitoring........................................................................................... 2-55
2.6.1 Alarm Box Input ............................................................................................. 2-56
2.6.2 Alarm Indicator .............................................................................................. 2-56
2.6.3 Interface for Actuators ................................................................................... 2-57
2.6.4 Communication ............................................................................................. 2-57
2.7 Lightning Protection System .................................................................................... 2-57
2.7.1 Overview....................................................................................................... 2-57
2.7.2 Lightning Protection for DC............................................................................ 2-59
2.7.3 Lightning Protection for Trunk Line ................................................................. 2-60
2.7.4 Lightning Protection for Antenna & Feeder Port .............................................. 2-62
3 Software Architecture ....................................................................................................... 3-1
3.1 Overall Architecture................................................................................................... 3-1
3.2 Module Description ................................................................................................... 3-2
3.2.1 Main Control Software ..................................................................................... 3-2
3.2.2 O&M Software................................................................................................. 3-4
3.2.3 Clock Software................................................................................................ 3-6
3.2.4 BCIM Software ................................................................................................ 3-7
3.2.5 BCPM Software............................................................................................... 3-8
3.2.6 BRDM Software .............................................................................................. 3-9
3.2.7 BTRM Software ............................................................................................. 3-10
4 System Function ............................................................................................................... 4-1
4.1 Transmission Networking .......................................................................................... 4-1
4.2 Call Procedure .......................................................................................................... 4-3
4.2.1 Speech Service Call Procedure........................................................................ 4-3
4.2.2 Data Service Call Procedure............................................................................ 4-6
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System Description
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