Ericsson Radio Systems AB BKRC1311004-1 Benutzerhandbuch
Unit Description, dTRU
8
Unit Description, dTRU
The dTRU (double Transceiver Unit) is a 2-TRX replaceable unit. A
TRX is a transmitter/receiver and signal processing unit which transmits
and receives one carrier. There are different versions of dTRU
depending on the frequency band and modulation method, that is only
GMSK or EDGE.
TRX is a transmitter/receiver and signal processing unit which transmits
and receives one carrier. There are different versions of dTRU
depending on the frequency band and modulation method, that is only
GMSK or EDGE.
The dTRU has two transmit antenna terminals and four receive antenna
terminals. The dTRU features a built-in hybrid combiner. The hybrid
combiner can be used to combine the two transmit antenna terminals to
one common terminal.
terminals. The dTRU features a built-in hybrid combiner. The hybrid
combiner can be used to combine the two transmit antenna terminals to
one common terminal.
Two of the receive antenna terminals are used for 2–branch diversity
reception. The dTRU is hardware prepared for 4–branch diversity
reception via the remaining two antenna terminals.
reception. The dTRU is hardware prepared for 4–branch diversity
reception via the remaining two antenna terminals.
8.1
Block Diagram
CPU
P007395A
system
Y-link
DSP
system
RC system
Radio system
DSP
system
RC system
Radio
trans-
mitter
Hybrid
comb
TX1
RX1
TX1+TX2
HC1
RX2
RX4
RX3
HC2
TX2
Radio
receiver
Radio
receiver
Radio
trans-
mitter
TX ctrl
TX data
RX data A
RX data B
RX ctrl
RX data A
RX data B
RX ctrl
TX ctrl
TX data
TX data
Radio System
Y-link
CDU-TX ctrl bus
B
A
B
A
Figure 87
Block diagram dTRU
The TRU consists of the following main blocks:
EN/LZT 720 0008
P2A
2001-11-28
155 (485)
© Ericsson Radio Systems AB
— All Rights Reserved —
P
re
li
m
in
a
ry