3 Board
M900/M1800 BTS3X Series Base Transceiver Station
Hardware Description Manual
3-22
Huawei Technologies Proprietary
Issue 01 (2006-11-18)
Figure 3-16
ECDU (type C) rear panel
TTA-M
FUSE
TTA-D
0 1 2
3
4
5
6
7
8
9
A
B
C
D
E
F
01 2
3
4
5
6
7
8
9
A
B
C
D
E
F
TMA M: Main receiving TMA knob
TMA D: Diversity receiving TMA knob
FUSE: Fuse (2A)
–
Two knobs shown in
are used to control the current strength of the TMA power
supply.
shows the mapping between the knob setting and the TMA current.
Table 3-13
Mapping between the knob setting and current strength of the TMA (type C)
Setting
TMA M
TMA D
Unit
0 OFF
OFF
–
1 100 65
mA
2 107 100
mA
3 205 205
mA