M900/M1800 BTS3X Series Base Transceiver Station
Hardware Description Manual
3 Board
Issue 01 (2006-11-18)
Huawei Technologies Proprietary
3-13
!
Use only the settings described in
.
!
Huawei recommends that MAIN and DIVERSITY be set to 100 mA and 200 mA respectively.
CDU (type D)
shows the CDU (type D) rear panel.
Figure 3-9
CDU (type D) rear panel
OFF
FUSE
TTA D
TTA D
1
2
3
TTA M
TTA M
1
2
3
1
2
3
OFF
OFF
TTA D
TTA D
FUSE
TMA M: TMA power feeding switch of main receiving channel
TMA D: TMA power feeding switch of diversity receiving channel
FUSE: Fuse (2A)
Two 3-option switches shown in
are used to control the current strength of the
TMA power supply.
shows the mapping between the switch setting and the TMA current.
Table 3-8
Mapping between the switch setting and the current strength of the TMA (type D)
Setting
TMA M
TMA D
Unit
1 100
65
mA
2 107
100
mA
3 205
205
mA