Ericsson RBS 2106 Hardware Reference Manual page 60

Radio Base Station
IDM – Internal Distribution Module
The IDM is a panel for distributing the internal +24 V DC power to the various
units. Each distribution circuit in the cabinet is connected to a circuit breaker in
the IDM.
Number of units: 1
PSU – Power Supply Unit
The PSU converts 120 – 250 V to regulated +24 V DC.
Number of units: 1 – 4
5.2 Optional Hardware Units
This section describes the RBS 2106 optional hardware units.
ASU – Antenna Sharing Unit
Antenna sharing is part of co-siting, that is, using another cabinet together with
a GSM RBS 2106 cabinet in the same sector. The ASU allows a TDMA (or
other) cabinet and a GSM RBS 2106 cabinet to share RX antennas.
Number of units: 0 – 1
ADM – Auxiliary Distribution Module
The ADM handles distribution and fuse connection of system voltage
(+24 V DC and -48 V DC) to the transport module (TM).
Number of units: 0 – 1
Battery Back-up
Batteries can be installed inside the cabinet in either of the TM/BM spaces
located to the left of the BFU. It is also possible to use an external source of
battery supply via the DC filter; if this is done, internal batteries may not be
used.
Bias injector
The bias injectors are used to provide the TMA with DC power from the
TMA-CM, over the RX/TX feeder cables. The bias injector is mounted
between the antenna feeder and the CDU.
Number of units: 0 – 6
16 (30)
RBS 2106
EN/LZT 720 0222 R3A