User Manual

Table Of Contents
Combining and Distribution Unit
1 Product Overview
This section includes a product overview of CDU-C+, a combining and
distribution unit used in high-capacity cells where low coverage is needed.
CDU-C+ can also serve as a replacement for the older CDU-C.
One or two CDU-C+ can be used, as well as one CDU-C+ together with one
CDU-C.
1.1 Main Functions
This section describes the main functions of CDU-C+:
Combining of two TX signals to one antenna
Distribution of two RX signals from two independent RX antennas
An extra receiver distribution amplier for use in small congurations
Simultaneous transmission and reception on one antenna (GSM 900
version)
Diversity reception (two CDU-C+s required)
Handling of up to six TRUs in one cell (three CDU-C+s required)
Baseband and synthesizer frequency hopping support
Power and supervision of an external Tower Mounted Amplier (TMA) via
the RX antenna cables (GSM 1800 and GSM 1900 versions)
Note: TMA is optional for GSM 1800 and GSM 1900.
1.2 Variants
CDU-C+ is available for:
•GSM900
GSM 1800
GSM 1900
All versions are identical, except for the frequency bands.
CDU-C+ is equipped with a duplexer which is bypassed when TMA is used.
Separate antenna feeders for the TX and RX signals in both the A and B signal
paths are then required.
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EN/LZT 720 0278 Uen R1B 2010-08-09