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User Manual
Airbridge cBTS3612 CDMA Base Station
RF interface
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The RF interface of BHPA has one input port and one output port. They are
connected respectively with BTRM RF output port via BTBM and CDU/DFU/DDU RF
input port via coaxial cable.
Power supply interface
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Interface with BTS Direct Current Switch box (BDCS).
Alarm interface
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Interface with BTRM. Fan alarm signals and power amplifier alarm signals are sent
via BTBM to BTRM.
IV. Index
Supported frequency band: 450MHz band, 800MHz band, 1900MHz band
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Max. average output power: ¦ 40W (for 450MHz band and 1900MHz band)
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Power supply: +27V
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Power consumption: <380W
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Module size: L%W%T=460mm%233.5mm%64mm
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2.3.4 BTS Transceiver Backplane Module (BTBM)
BTBM interconnects six BTRMs and six BHPAs. It provides six sets of 2mm
connectors for BTRM, six sets of 24W7 combination D -type blind mate connectors
for BHPA, and three DB9 connectors for RLDU alarm collection, and six sets of
temperature sensors.
The above parts form three independent function groups, as shown in Figure 2-18.
BTRM 2mm connector
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Each set of 2mm connectors includes one 5%22pin A-connector and three 3-socket-
N-connectors. A-connector transfers R LDU alarm signals from DB9 connector and
RS485 interface message from BHPA 24W7 combination D-connector. N-connector
transfers the main/diversity input/ output RF signal of BTRM and +27V DC power
signal needed by BTRM.
BHPA 24W7 D-type combination blind mate connector
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Each 24W7 D -type combination blind mate connector includes 2 coaxial contacts
(transferring BHPA input/output RF signals), 2 high-current power contacts
(transferring +27V power supply and PGND signals), one set of RS485 signal
contacts and a group of contacts for temperature sensor signals.
DB9 connector
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There are 3 angled DB9 connectors on BTBM for 3 RLDUs alarm signals transferred
to BTRM.
¦ 30W (for 800MHz band)
2-30
System Description
2 Hardware Architecture
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