External Interfaces; Indices - Huawei Airbridge BTS3612A-1900 Technical Manual

Technical Manual
Airbridge BTS3612A CDMA Base Station
I. Filter
The filter on the transmitting channel filters transmitting signal.
The filter on the main/diversity receive channel filters main/diversity receive signals
respectively. Then it sends them to low noise amplifier in the RLDU for amplification.
II. Duplexer
The duplexer is used to isolate transmitting and receiving signals, suppress
transmission spurious and reduce antenna quantity.
III. Directional coupler
The directional coupler couples forward/reverse power for RLDU, and monitors the
antenna VSWR.

3.6.3 External Interfaces

DFU is a module shared by the transmit and receive paths of the BTS. Therefore, it has
interfaces with other modules in both the transmit and receive paths.
Its external interfaces include a set of 8W8 D-type combination blind mate connectors
on the backside, and a set of N connectors and SMA connectors on the front side. The
interface signals include:
The signals between DFU and BHPA, which are transferred through the blind
mate connectors on the backside.
BTS transmitting signals, which are transferred to the cabinet-bottom antenna
interface through the RF cable connected with the N-connector at the front side of
the module.
BTS receiving signals, which are transferred from the cabinet-bottom antenna
interface to DFU for filtering through the RF cable connected with the N-connector
on the front side of the module.
BTS receiving signals output from the duplexer and diversity receive filter. They
are sent to RLDU via the blind mate connector on the backside.
Forward/reverse coupled RF signals, which are sent to RLDU via the blind mate
connectors on the backside.
Forward/reverse coupled test signals, which are output through the standard SMA
connector on the front side.

3.6.4 Indices

Supported frequency band: 450MHz
Module dimensions: 450mm%100mm%344.8mm (Length % Width % Depth)
Chapter 3 Radio Frequency Subsystem
3-13
System Principle