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User Manual
Airbridge cBTS3612 CDMA Base Station
Perform operation and maintenance via the backplane bus for other boards in
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the baseband subrack, realizing in-band signaling communication.
Connected with Local Maintenance Function (LMF) through the 10/100M
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compatible Ethernet interface.
The active/standby asynchronous serial port serves as a path for out-band
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signaling backup. MPU functions as the main node and other boards function
as the standby nodes. When a fault occurs to the in-band signaling path,
signaling communication can be maintained with this standby path.
Provide an interface connected with Modem in compliance with RS232 serial
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communication standard, realizing remote maintenance and monitoring in case
of OML link failure.
Connected with an external monitoring module in compliance with RS485
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standard, collecting and processing the equipment room environment
information (such as fire alarm/water soaking/temperature/ humidity).
CLK unit is the clock source of BTS system, providing working clock for all
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boards. It provides high precision oscillation clock and can be synchronized
with an external clock (such as GPS clock).
BCKM provides active/standby switchover function, working in active/standby
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mode in the system. When a fault occurs to the active BCKM, the standby
BCKM is switched to active status under the control of specific software. A fault
occurring to either MPU or CLK module of the BCKM will result in the
switchover of the whole BCKM.
II. Structure and principle
The structure of BCKM module is as shown in Figure 2-4.
Other
functional units
Figure 2-4 Structure of BCKM module
BCKM
External
communication
unit
MPU module
Power supply
module
2-8
System Description
2 Hardware Architecture
CBKM
Clock module
Backplane
Backplane bus
bus
module
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