Product Description Part 2

RBS 2207
PSU - Power Supply Units
The PSUs are available in two versions, PSU AC for co nnection to AC mains,
or PSU DC for connection to -48 to -60 V DC power supply. The PSU AC
converts 120 - 250 V to re gulated +24 V DC. The PSU DC converts -48 to -60
V DC to regulated +24 V DC.
Number of units: 0 - 2
DC Filte r
The DC filter unit is the inter fa ce for +24 V DC power supply or ba ttery back-up.
Number of units: 0 - 1
5.2 Optional Hardware Units
This section describes the optional RBS 220 7 hardware units.
Bias injector
The bias injector is used to p rovide the ddTMA with DC power, from the
TMA-CM, o ver the RX/TX feeder cables. Six bias injectors can be connected
to one TMA-CM. The BIAS-IC is mounted o utside the cabinet, as close to the
RF output as possib le.
Number of units: 0 - 6
BBS
The RBS 2207 can be provided with battery back-up from an external c abinet,
either a BBS 2000 or a BBS 2202 equipped with BFU-21 or BFU-22.
ddTMA - dual duplex Tower Mounted Amplifier
The ddTMA is to be mast-mounted and placed close to the an te nna. It improv es
the receiver sensitivity. The ddTMA sa ves feeder cables by duplexing RX and
TX signals to the same cable.
Number of units: 0 - 6
TMA-CM - Tower Mounted Amplifier - Control Module
The Control Module is used to provide up to six d dTMAs with 15 V DC power
through the bias injector. It is also used to identify TMA faults and forward this
information to the alarm module in the RBS.
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N/LZT 720 0134 Uen R3A