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User Manual
Airbridge cBTS3612 CDMA Base Station
5.1.2 Baseband Subrack Configuration
The baseband subrack in full configuration is shown in Figure 5-3.
Figure 5-3 The baseband subrack in full configuration
The boards in the baseband subrack include BCIM, BCPM, BRDM, and BCKM. The
boards should be configured according to the following rules
I. BCIM
BCIM provides interface to BSC. BCIM is configured according capacity demand
and service type. 2 BCIMs are needed in full configuration (in this case they can
operation in load sharing mode). Each BCIM boards can support 8 E1 links.
II. BCPM
BCPM board is the channel processing board of BTS. At most 12 BCPMs can be
configured in the baseband subrack. There are two types of BCPMs. The
processing capability of type-A BCPM is 64 reverse channels and 128 forward
channels, while the capability of type-B BCPM is 128 reverse channels and 256
forward channels
BCPMs are configured based on the channel processing capability required by the
system, with consideration of BTRM quantity and board types. Typical configurations
are listed in Table 5-1.
The board Nos. of BCPMs are not successive. The left six are numbered as No.0 to
No.5, while the right six are numbered as No.8 to No.13.
When configuring BCPM, note the difference between the inner half subrack and
outer half subrack. BCPMs No.0, No.1, No.2, No.3, No.12 and No.13 belong to the
outer half subrack, while BCPMs No.4, No.5, No.8, No.9, No.10 and No.11 belong to
the inner half subrack. The BCPMs in different half subracks cannot be configured in
the same CE pool.
0
1
2
3
4
5
6
7
B
B
B
B
B
B
B
B
C
C
C
C
C
C
C
C
I
I
P
P
P
P
P
P
M
M
M
M
M
M
M
M
5-4
8
9
10
11
12 13 14 15 16 17 18 19 20 21
B
B
B
B
B
B
R
R
C
C
R
R
D
K
K
D
D
D
M
M
M
M
M
M
System Description
5 System Configuration
B
B
B
B
B
B
B
B
C
C
C
C
C
C
R
R
P
P
P
P
P
P
D
D
M
M
M
M
M
M
M
M
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