Edu; Functions; Structure And Principle; Figure 3-17 Edu Structure - Huawei BTS3 Series Hardware Description Manual

M900/M1800 BTS3X Series Base Transceiver Station
Hardware Description Manual

3.6 EDU

3.6.1 Functions

The EDU is designed for wide coverage and low loss.
It realizes the following functions:
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It also provides the TMA feeding. Each TRX uses independent antenna. The transmitting
combiner is unnecessary. The receiving mode is 1-into-2.
The EDU supports the following frequency bands:
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The maximum input power of its single port is 100 W.

3.6.2 Structure and Principle

The EDU has multiple panel types, but the structure and the principle of the EDU are the
same in any cases. For details, see

Figure 3-17 EDU structure

Transmitting
Receiving
Receiving
Transmitting
Issue 01 (2006-11-18)
Use only the settings described in
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Huawei recommends that MAIN and DIVERSITY be set to 100 mA and 200 mA respectively.
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Combining and filtering of transceiving duplex and transmitting signals
Filtering of receiving signals
Low-noise amplification
Dividing of receiving signals for TRXs
GSM900
GSM1800
GSM1900
EDU
input
Divider
output
Divider
output
input
Huawei Technologies Proprietary
Table 3-13.
Figure 3-17.
Test
Duplexer
coupler
Low noise
amplifier
Alarm and control
Low noise
amplifier
Test
Duplexer
coupler
3 Board
TA
feeder
unit
TA
feeder
3-23