Huawei Airbridge BTS3612A-1900 Technical Manual page 61

Technical Manual
Airbridge BTS3612A CDMA Base Station
Input busbar
Output busbar
Figure 5-4 AC-DC conversion and distribution of –48V DC
Then the DC distribution busbar sends the –48V DC to the power consumption units
such as the PSU
equipment, and the internal and external circulation fans in the heat exchanger.
II. Distribution of +24V DC
Figure 5-5 illustrates how the –48V DC is converted into +24V DC and then distributed.
The -48V DC is output to the -48V DC power input busbar on the backplane of the
PSU
DC/DC
supplies to the output busbar. Then the power is sent to the distribution busbar of the
DC distribution box on the top of the cabinet along the cables in the cabling trough.
-48VIN
GND
PSU
PGND
Figure 5-5 DC-DC conversion and distribution of +24V DC
AC distribution unit
220V AC
PSU
PSU
DC distribution busbar
subrack, batteries, transmission equipment, fans, lighting
DC/DC
subrack. The PSU
DC/DC
DC/DC
DC/DC
DC/DC
subrack
DC/DC
9 service processing units
Chapter 5 Power & Environment Monitoring Subsystem
.....
PSU
PMU
-48V DC
converts the power and outputs multiple +24V DC
Switch box
...
Wiring terminals
...
DU
BTRM0 BTRM5
5-4
System Principle
RLDU0
RLDU1