User's Manual Part 1

DSPbR Series – User’s Manual
Document Number 00000.B Page 13/75
Each RFBE and corresponding BPFM module is internally partitioned into Side “A” and Side “B”, effectively
providing two RFBE’s per RFBE module. The BPFM must correspond in terms of frequency compatibility with
the RFBE. Fitting both sides of the module with RFBE’s is optional and dependent on the required configuration
and prospect of future expandability and upgradability.
A four channel single band non-frequency translating DSPbR will use a single RFFE board (side “A” of the
RFFE module) for the uplink and a single RFFE board (side “B” of the same RFFE module) for the downlink.
The full 20 MHz bandwidth of both RFFE boards will be converted from analogue to digital and individual
channels are processed through their respective IF filter profiles and then converted back to analogue and fed
into the respective uplink and downlink RFBE boards.
The Ref Gen + Aux/GPS module is primarily purposed to provide a reference signal against which the DSPbR
is referenced. A reference signal can be sourced via the onboard GPS receiver or from a 10MHz external
reference. A multiband cellular modem option is also available fitted to the Ref Gen+ Aux board for SMS alarm
notification. It will be possible using a firmware upgrade in the future, to bridge an IP network with the cellular
modem in a TCP/IP session where an IP network is not available on site.
The DSP module is partitioned into Side “A” and Side “B” boards, populated according to the number of
channels and bands that require processing.
The CSC module is fitted with the non-replaceable back-up lithium ion batteries. The CSC module controls and
manages all processing requirements, including providing a CAN bus extension to facilitate multi-rack
configurations.
Internal or external uplink and downlink combining
The downlink and uplink RFBE RF outputs can be either internally (8-Channel combiner filter unit contained
within sub rack frame) or externally combined.
An internal 8 channel combiner filter unit option is available which has been designed to fit directly to the
outputs of the RFBE modules, replacing the channel specific Band Pass Filter Modules (BPFM’s). The
transmitter combiner however has a real estate footprint which extends over a total of four consecutive RFBE
modules (8 RFBE channels). The combiner unit fits within the spatial confines of the sub rack frame.
An Internal combiner filter unit is available in all bands. A single combiner can be fitted to either the outputs of
the uplink RFBE’s and or downlink RFBE’s.
External combining can be provided outside of the sub rack frame.
Where external combining is the preferred option, the individual outputs via the RFBE – BPFM’s are extended
to the rear of the sub rack frame where they can be fed via coaxial cables into an external combiner.