Technical Manual
Airbridge BTS3612A CDMA Base Station
System Principle
Chapter 5 Power & Environment Monitoring Subsystem
5-3
Lightning
arrester
220VAC
Air
s
w
itc
h
A
N
B
N
C
N
63A
63A
Voltage
regulator
Air conditioner/heat
exchanger
32A
PSU
AC/DC
Reserved
10A
AC distribution unit
A,N
B,N
+24V DC
N
L
C,N
+24V DC
PSU
EM
I f
il
te
r
AC/DC
Figure 5-3
Distribution of single-phase 220V AC
III. Distribution of three-phase 110V AC
If the single-phase 110V AC is used for the BTS3612A, an air conditioner (or heat
exchanger) and a PCU
AC/DC
that support 110V AC should be configured. The rest
configuration is the same with the distribution of three-phase 220V AC.
IV. Distribution of single-phase 110V AC
If the single-phase 110V AC is used for the BTS3612A, a wiring terminal for phase
conversion should be equipped before the air switch to convert the single-phase power
into three-phase power. The rest configuration is the same with the distribution of
three-phase 110V AC.
5.2.2 DC Distribution
I. Distribution of –48V DC
Figure 5-4 illustrates how the 220V AC is converted into –48V DC and then distributed.
The 220V AC is output by the AC distribution unit to the 220V AC power input busbar
on the backplane of the PSU
AC/DC
subrack. The PSU
AC/DC
converts the power and outputs
multiple –48V DC supplies to the busbar.
