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User Manual
Airbridge cBTS3612 CDMA Base Station
Leads in system power and provides distributed power to all boards.
l
Leads in the signal monitoring line for fan subrack and power subrack.
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Provides protection against misplug.
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II. Structure
Functional units in CBKM are as shown in Figure 2-8.
Figure 2-8 Functional units of all slots in CBKM
A backplane includes the connector and board slot.
Connector part includes a slot for test board, input connector of backplane +27V
power/ground, and 3 DB37 D-connectors. Power input connector, D-connector are
all crimped devices.
Slots of the backplane are defined as follows:
Slots 0~1 are for BCIMs.
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Sots 10~11 are for BCKMs.
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Slots 8~9, 12~ 13, 20~21 are for BRDMs.
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Slots 2~7, 14~ 19 are for BCPMs.
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III. Interface
The interfaces between the backplane and external devices include:
System power interface
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Remote maintenance serial port
l
Environment alarm interface
l
Fan alarm serial port in baseband subrack
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System external synchronization interface
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16 E1 interfaces
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IV. Index
CBKM size: 664mm%262mm.
0
1
2
3
4
5
6
8
7
B
B
B
B
B
B
B
B
B
C
C
C
C
C
C
C
C
R
I
I
P
P
P
P
P
P
D
M
M
M
M
M
M
M
M
M
9
10
11
12 13 14 15 16 17 18 19 20 21
B
B
B
B
B
B
B
R
C
C
R
R
C
C
D
K
K
D
D
P
P
M
M
M
M
M
M
M
2-18
System Description
2 Hardware Architecture
B
B
B
B
B
B
C
C
C
C
R
R
P
P
P
P
D
D
M
M
M
M
M
M
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