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Technical Manual
Airbridge BTS3612A CDMA Base Station
3.3.3 External Interfaces
External interfaces of the BHPA module are D-type combination blind mate connectors,
including:
RF interface
The RF interface of BHPA has one input port and one output port. They are connected
respectively with BTRM RF output port via BTRB and CDU/DFU/DDU RF input port via
coaxial cable.
Power supply interface
Interface with BTS3612A TRx Backplane (BTRB), This interface is used to provide
+24V power supply to BTRM.
The +24V power is supplied with the BTS Direct Current Switch box (BDCS).
Alarm interface
Interface with BTRM. Fan alarm signals and power amplifier alarm signals are sent via
BTRB to BTRM.
3.3.4 Indices
Supported frequency band: 450MHz, 800MHz, and 1900MHz
Power supply: +24V
Power consumption: <380W
Dimensions: 460mm %233.5mm %64mm (Length % Width % Depth)
3.4 BTRB
3.4.1 Overview
The BTS3612A TRx Backplane (BTRB) accomplishes the following functions:
Fastening the connection between BTRM and BHPA.
Fastening the RLDU.
Monitoring BHPA temperature.
Providing alarm signal interface between BTRM and RLDU.
Key internal parts of BTRB include connectors and temperature sensors.
3.4.2 Structure and Principle
The BTRB structure is as shown in Figure 3-4.
Chapter 3 Radio Frequency Subsystem
3-8
System Principle
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