Reference Manual

Unit Description, ASU
12 Unit Description, ASU
This chapter describes the Antenna Sharing Unit (ASU).
Antenna sharing is part of co-siting, that is, using another cabinet
together with a GSM cabinet in the same sector. The ASU allows a
TDMA (or other) cabinet and a GSM cabinet to share RX antennas. It
does this by sharing the RX signals, which come from the CDU,
between both cabinets.
The ASU is a broadband product, which means that it covers 800–1910
MHz.
12.1 Block Diagram
Coupler 1
Coupler 6
Coupler 2
Coupler 3
Coupler 4
Coupler 5
Atten.
control
DC/DC
converter
CXU-RX1 (CDU1)
CDU1-RX1
CXU-RX2 (CDU1)
CDU1-RX2
CXU-RX1 (CDU2)
CDU2-RX1
CXU-RX2 (CDU2)
CDU2-RX2
CXU-RX1 (CDU3)
CDU3-RX1
CXU-RX1 (CDU3)
CDU3-RX2
+ 24 V
Ant. S1
Ant. S2
Ant. S3
Ant. S4
Ant. S5
Ant. S6
TMA
No TMA
P008480A
Figure 97 ASU block diagram
12.1.1 ASU Design
The ASU is located between the CDU and the CXU. See figure below.
The ASU connector panel is protected by a protective plate (when
used). This is mounted above the CXU. The plate prevents heavy
objects from hitting against connectors that may be damaged otherwise.
EN/LZT 720 0008 P2A
2001-11-28
171 (485)
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