Reference Manual Part 1

RBS 2206
HCU
The HCU contains three hybrid combiners. Each hybrid combines two RF
signals, delivered from two dTRUs, into one.
Number of units: 0 – 1
OXU
The following Optional Expansion Unit (OXU) positions are available:
• Four spaces in the DXU/PSU subrack
• One 19-inch OXU position is available between the CXU and the dTRU
subrack.
RUs which typically are located in the OXU slots include the DXX and the
TMA-CM. The 19-inch position above the CXU is used for an ASU in co-sited
cabinets.
TMA-CM
The TMA-CM is used to provide up to six ddTMAs 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. The TMA-CM is mounted in
an OXU position.
Number of units per cabinet: 0 – 2
6 Interfaces
In this section all external and internal connections are listed, as well as the test
interface and the operator interface.
The connection field for external connectors is located at the top of the radio
cabinet inside the door. Internal connections, the test interface and operator
interface are located on some hardware units.
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EN/LZT 720 0225 Uen R6A