Reference Manual Part 1

RBS 2106
DXX
The Digital Cross Connector (DXX) is a plug-in unit which combines
cross-connect, control and interface functions. It has four 2 Mbit/s interfaces
complying with the G.703 standard. If the DXX option is used, then it is located
in an Optional Expansion Unit (OXU) position in the DXU/ PSU subrack.
Number of units: 0 – 1
ESB
TG synchronization is the technology used to expand one RBS 2106 cabinet
with another RBS cabinet in the same cell. The External Synchronization Bus
(ESB) is the cable connected between the DXUs.
Number of units: 0 – 1
Gas Collecting Kit
The acid leads can be supplied with gas evaporating kit. This is to eliminate
gases from the cabinet.
Number of units: 0 – 1
HCU
The HCU contains three hybrid combiners. Each hybrid combines two RF
signals, delivered from the dTRU, 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 Antenna Sharing
Unit (ASU) in co-sited cabinets.
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N/LZT 720 0222 Uen R6A