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User Manual
Airbridge cBTS3612 CDMA Base Station
2.5.2 General Structure
The -48V power is filtered by the EMI filter on top of the cabinet, and then goes
down along the wiring trough, and finally connected to the input bus bar of t h e
power subrack backplane. The power supply subsystem uses five +27V/65A DC/DC
power supply units (PSU) in full configuration. These five PSUs operation in 4 +1
redundancy to ensure an output of at least 7200W. The size of PSU is L%W%H =
400mm%121.9mm%177.8mm.
The overall structure of the power supply system is shown in Figure 2-26.
-48VIN
GND
Power supply subrack
PGND
Figure 2-26 Structure of power supply system
2.5.3 Technical Indices
I. DC input lightning protection
DC input lightning protection part is an external cabinet -top lightning arrester. It
mainly features:
Temperature-controlled fusing technology and built-in over-current protection
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circuit to prevent fire.
Multiple autonomous current equalization technology used to withstand
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successive lightning attack.
Common mode and differential mode protection, and low residual voltage.
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Dual-color working status indication, with remote alarm node.
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Small in size and easy installation.
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DC/DC
DC/DC
DC/DC
DC/DC
DC/DC
DU
16 service units
2-51
2 Hardware Architecture
Switch box
Indicator PCB
...
Wiring terminals
...
...
TRX0
TRX11
RLDU0
RLDU1
System Description
-48V power supply indication
From cabinet-top LGND
RLDU2
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