User's Manual Part 2

DSPbR Series – User’s Manual
Document Number 00000.B Page 25/75
A DSP board in side “A” is wired to take inputs from RFFE boards in slots 9 & 8 and drives RFBE boards in
slots 1, 2, 5 & 6. A DSP board in side “B” takes inputs from RFFE boards in slot 7 and drives RFBE boards in
slots 3, 4, 7 & 8.
The DSP module can be removed and replaced whilst the DSPbR is powered, however the functionality will
cease, inhibiting the signal path between RFFE and RFBE’s whilst a DSP module is unplugged. An arrow with
the letters “UP” on the rear face indicates the module orientation.
3.3.6 RFFE – RF Front End Module
An RFFE module is partitioned into side “A” and side “B”. Two RFFE boards are fitted into an RFFE module.
The RFFE boards can be in different bands, however the BPFM fasted to the RFFE module must have the
corresponding Side “A” and Side “B” band pass filters.
The motherboard architecture accommodates up to six RFFE boards (three modules). The 1
st
slot allocation for
the RFFE module is slot 9 (please note that slot 9 is dedicated to an RFFE slot only) followed by slots 8 and 7
respectively.
The frequency bandwidth of each RFFE is a contiguous 20MHz. One RFFE can feed any number of
corresponding channelized RFBE’s. This is true for bi-directional uplink and downlink configurations.
Although the individual channel frequency and its characteristics within an RFFE band is adjustable, the RFFE
band is fixed and is not adjustable. A different RFFE module is required for each 20MHz band.
Figure 8 – DSP Module