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Technical Manual
Airbridge BTS3612A CDMA Base Station
2.2.4 Indices
Power voltage: +24V.
Power consumption: <20W.
Dimensions: 460mm%233.35mm (Length%Width).
2.3 BCIM
2.3.1 Overview
The BCIM is located in BTS baseband subrack. It is a functional entity for the
connection of BTS and BSC. Its major functions are as follows:
In uplink direction, backplane bus receives O&M command from BCKM and traffic
data from BCPM, and transmit ATM cells on the multiple E1 links to BSC with IMA
technology in compliance with G.804 standards.
In downlink direction, it receives ATM cells distributed on the multiple E1/T1 links
from BSC, multiplexes them into a single ATM cell flow with IMA technology and
finally sends them to corresponding processing boards through the backplane
bus.
Each BCIM provides 8 E1/T1 links, which can support at the most 4 IMA link sets.
In BTS, there are two BCIMs, working in load sharing mode and providing physical
interfaces to BSC. At the most 16 E1/T1 links can be provided.
It communicates with BSC through IMA state machine program on the local board
and monitors the working status of E1/T1 link to ensure the implementation of IMA
protocol.
It transmits O&M command through backplane bus or emergency serial port,
reports the status information of the local board to BCKM and provides interface
for board maintenance and network management.
2.3.2 Structure and Principle
BCIM is available in two specifications:
BCIM with E1 interface.
BCIM with E1/T1 interface. This type of BCIM works either in E1 mode or T1 mode
according to the setting of the DIP switches.
Figure 2-3 illustrates the structure of BCIM with E1/T1 interface.
Chapter 2 Baseband Subsystem
2-5
System Principle
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