Table of Contents
Advertisement
3 Board
Besides the basic combining and dividing function, the CDU also has the following functions
for alarm test:
!
!
!
!
3.6.3 Front Panel
Figure 3-18
3-24
Standing wave test:
The status of the antenna feeder can be monitored. When the standing wave exceeds the
preset threshold, that is, 2.5:1, the CDU reports minor alarm, and the indicator on the
front panel is ON.
Low-noise amplifier faulty alarm
Fault signals are from the power supply current of low-noise amplifier. The alarm is
generated when the current exceeds a certain range or no current is detected.
TMA alarm
When the TMA works, the CDU judges the working status of the TMA according to its
working current. The alarm is generated when the current exceeds a certain range or no
current is detected.
Control function
The EDU performs power attenuation control of the main receiving channel and
diversity receiving channel (dynamic range: 15 dB, step: 1 dB). It realizes powering on
and off the TMA feeding. The TMA feeding can be powered off automatically in TMA
alarm.
shows the front panel of the EDU.
Huawei Technologies Proprietary
M900/M1800 BTS3X Series Base Transceiver Station
Hardware Description Manual
Issue 01 (2006-11-18)
Advertisement
Table of Contents
