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User Manual
Airbridge cBTS3612 CDMA Base Station
2.7.2 Lightning Protection for DC
I. Multi -level protection of power supply
The BTS power supply subsystem is normally in 5 -level protection, as shown in
Figure 2-28.
3-phase AC
Great power-absorbing
response, at cable inlet
of the room, optional
Figure 2-28 Illustration of lightning protection of BTS power
II. Principle of DC lightning arrester
Level-5 protection is a built-in integrated lightning arrester on the cabinet-top box.
The operation principle is as shown in Figure 2-29.
-48V
GND
Figure 2-29 Illustration of lightning protection of BTS power
6kV
Level-1 protection
Considerable
capability, slow
power-absorbing
capability, normal
response, at the AC
distribution point
Lightning arrester
4 kV
2.5 kV
Level-2 protection
Level-3 protection
Normal power-absorbing
capability, quick
response, in front of
rectifier module
2-59
System Description
2 Hardware Architecture
1.5 kV
Level-4 protection
.
.
AC/DC
.
Low power-absorbing
capability, very quick
response, in rectifier
module
EMI
Signal line
PGND
Wiring terminal
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