Ericsson RBS 2106 Reference Manual page 95

RUs which typically are located in the OXU slots include the Mini-
DXC, 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.
Mini-DXC
Mini-DXC together with the DXU improves the BTS site access. This
in turn improves utilization of the PCM links, and minimizes both
traffic disturbances upon reconfiguration, and the effect of link failures.
If the Mini-DXC option is used, it is located in one of the four Optional
Expansion Unit (OXU) positions in the DXU/PSU subrack.
DXX
Digital Cross Connect (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, it is
located in the Optional Expansion Unit (OXU) positions in the DXU/
PSU subrack.
TMA-CM
The control module for the tower-mounted amplifier (TMA-CM) is used
to provide the Dual Duplex Tower Mounted Amplifiers (ddTMA) with
15 V DC power through the bias injector. It also identifies ddTMA
faults and forwards this information to the alarm module in the RBS. If
the TMA-CM is used, it is located in one of the four Optional
Expansion Unit (OXU) positions in the DXU/PSU subrack.
Antenna Sharing Unit (ASU)
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, for example, a TDMA (or other) cabinet and a GSM RBS 2106
cabinet to share RX antennas. It does this by sharing the RX signals,
which come from the CDU, between both cabinets.
The ASU occupies the OXU 19" space, see Figure 32 on page 87.
TM
The Transport Module (TM) is an empty space in the RBS 2106 cabinet
where certain transmission equipment units can be mounted. Further
information on the TM can be found in Section 5.6.3 on page 107.
EN/LZT 720 0008 P2A
2001-11-28
© Ericsson Radio Systems AB
— All Rights Reserved —
Product Data RBS 2106
93 (485)