Vanu Anywave Base Station Subsystem, Руководство оператора

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10
RF Front End
The wideband RF front ends perform transmission and reception over the air interface between the BTS and a number of
GSM mobiles. Using a wideband multi-channel front end allows one BTS unit to transmit and receive multiple carriers over a
wide frequency band of up to 25 MHz.
The RF front ends include both the RF up/down converters and the digital IF subsystem, which perform digital filtering,
timestamp injection and other functions. The BTS software communicates with the RF front ends using digital baseband
samples.
Protium RF Front End Unit
Your deployment includes four Protium RF Front Ends, all of which have a Duplexer, an Up/Down converter, and also do
channelization and resampling. The Protium RF Front End Units are divided into two compartments for noise containment.
The lower compartment contains the Duplexer and associated filters. The upper compartment contains the RF Up/Down
converters, analog-to-digital converters, digital-to-analog converters, and other digital hardware.
The RF signals are piped between the two compartments externally to maintain the noise separation. We will refer to the
lower compartment as the Duplexer and the upper compartment as the Up/Down Converter for simplicity. The units will be
installed and serviced as one box, but for clarity we will describe them here as two components.
Figure 5: Protium Translator System Block Diagram