User Manual

Base Station User Guide 15
Base Station Top Section
The top section of the BSR houses the Diplexer module (including the TX/RX Diplexer
and the directional couplers), the upstream LNA module (including upstream LNA, Band
Pass Filter and splitters), the upstream Downconverter modules (including
Downconverter and splitter), ground-bus to facility point, and electric power to facility
point. The antenna connection ports are located on the top of the rack.
The Diplexer, LNA, and Downconverter each consist of three units. Each unit serves a
single sector. The units serving sector 1 are located towards the front of the rack, the
units serving sector 2 are located towards the rear of the rack, and the units serving
sector 3 are located in the middle.
The test point cluster for the top section includes test Points 5, 6 and 7, which provide
RF samples of the upstream signal post-LNA (prior to Downconverter).
Figure 6: Top Section Physical Layout – Front and Back Views
The various components of the Base Station are described below.
Base Station Main Components
The Base Station includes the following main components:
 WMTS, described on page 3.
 Upconverter, described on page 3.
 Power Amplifier, described on page 3.
 Diplexer, described on page 3.