Huawei Airbridge BTS3612A-1900 Technical Manual page 77

Technical Manual
Airbridge BTS3612A CDMA Base Station
I. BCIM
BCIM has two versions: QC51BCIM and QC52BCIM. QC51BCIMsupports eight E1
links. Compared with QC51BCIM, QC52BCIM has more functions as follows: timeslot
cross-connection, fractional ATM transmission, and T1 transmission functions.
For the configuration of BCIM links, refer to the following typical data:
For S(1/1/1) BTS, configure one E1/T1 link.
For S(2/2/2) BTS, configure two E1/T1 links.
The above data is based on CDMA2000 1X system. For IS95 system, the above
quantity can be reduced by half.
When the transmission resource is limited, the fractional ATM network function of
QC52BCIM can be deployed to configure specific timeslot in a specific E1/T1 link to
the BTS.
II. BCPM
At most 6 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.
The processing 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 8-1.
The board Nos. of BCPMs are not successive. The left three are numbered as No.4,
No.5, and No.8, while the right three are numbered as No.9, No.10, and No.11.
Table 8-1 Configuration of BCPMs
BTS configuration
O(1)
O(2)
S(1/1/1)
S(2/2/2)
The above configurations are for CDMA2000 1X system. For 3-sector configuration,
type-B BCPMs are recommended. For IS95 configuration, the quantity should be
reduced by half.
Number of type-A BCPM
1
2
2
4
8-2
System Principle
Chapter 8 BTS Configuration
Number of type-B BCPM
Not recommended
Not recommended
1
2