Product Description
Limited Internal
PRODUCT DESCRIPTION 15 ( 27 )
EAB/SEMCON Staffan Paulusson EN/LZT 720 0491 Uen
EAB/RKW Lena Jonsson Borg 2004-12-28 R1A
Prepared (also subject responsible if other) No
Approved Checked Date Rev Reference
E
IDM
The Internal Distribution Module (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
The PSU converts 120 – 250 V to regulated +24 V DC.
Number of units: 2 – 3
DF
The Distribution Frame (DF) is a connection field for external alarms,
ESB, PCM links, GPS, and DC out. It also provides space for optional
configuration-dependent overvoltage protection.
Number of units: 1
5.2 Optional Hardware Units
This section describes the RBS 2107 optional hardware units.
Battery Backup
Batteries can be installed inside the cabinet in the upper or both battery shelves
located to the left. An external source of battery supply can also be used
through the DC filter. If this is the case, then internal batteries cannot 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 injectors are attached at the
antenna feeder inlet.
Number of units: 0 – 6
DC/DC Converter
The DC/DC converter can supply -48 V DC power to transmission equipment in
the TM compartment. It converts +24 V DC to -48 V DC.
Number of units: 0 – 2
DC Filter
The DC filter is the interface between a +24 V DC external power source, such
as a battery, and the IDM inside the RBS.
The DC filter has the following main functions:
• ElectroMagnetic Combatibility (EMC) filtering
• Connection of +24 V DC to the cabinet