User Manual

CDU-DCombining and Distribution Unit
TXBP (FU)
The TXBP lets TX signals between two specified levels
pass and removes unwanted out-of-band signals
MCU
The MCU measures forward and reflected signal levels
at the CDU output. The measurements are used for
tuning the filters and measuring the antenna VSWR.
4.2 RX Part
The RX part consists of the following units:
• FUd (if duplexer – GSM 900 and GSM 1800 versions)
• Distribution Unit (DU)
FUd
See Page 7.
DU
The DU amplifies the RX signal and distributes it to the TRUs. The amplification
and distribution functions are doubled to be able to distribute the signal from
two antennas. It consists of the following units:
• Two RX Band-Pass Filters (RXBP)
• RX Distribution Amplifier (RXDA)
• Splitters
• Bias Injector
Bias Injector
The bias injector provides power to and supervises an
optional TMA.
RXBP The RXBP lets RX signals between two specified levels
pass and removes unwanted out-of-band signals.
RXDA RXDA amplifies the RX signal.
Splitter
The splitter distributes the RX signal to six RX outputs
on the TRUs.
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EN/LZT 720 0279 Uen R1A