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User Manual
Airbridge cBTS3612 CDMA Base Station
IV. Board level reliability design
Many measures have been taken to improve the board reliability. Moreover, the
system reliability is improved through the redundancy design of key parts.
Key circuits are designed by Huawei, which lays the foundation of high
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reliability.
The hardware WATCHDOG is equipped for the board, and the board can
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automatically reset in case of fault.
The board is provided with the functions of over-current and over-voltage
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protection and the function of temperature detection.
The board also provides emergency serial port, and can keep contact with the
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main control board in case of emergency.
Strict thermal analysis and simulation tests are conducted during the design of
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boards for the purpose of ensuring longtime operation.
The board software and important data is stored in the non-volatile memory, so
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that the board can be restarted when the software upgrading fails.
V. Overvoltage and overcurrent protection
The BTS system provides various means of over-voltage and over-current
protection.
Over-voltage and over-current hardware protection is provided for the DC/DC
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power supply module.
For secondary power supply to boards, slow-start is employed to prevent the
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great impact on the whole power supply load when the boards are powered on.
Fuse is installed for each board against over-current.
For E1 interface circuit, serial-port circuit and network interface circuit,
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protection measures are taken in accordance with the corresponding design
specifications of Huawei.
VI. Power supply reliability
The reliability of power supply is improved by means of over-current and
over-voltage protection, internal temperature adjustment, and redundancy backup.
VII. Fault detection, location and removal
The BTS system is equipped with the functions of self-detection and fault diagnosis
that can record and output various fault information. The common software and
hardware faults can be corrected automatically.
The hardware fault detection functions include fault locating, isolating and automatic
switchover. The maintenance engineers can identify the faulty boards easily with the
help of the maintenance console.
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System Description
1 System Overview
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