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Airbridge cBTS3612 CDMA Base Station
EMI requirement
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Conducted interference:
At frequency 150kHz~30MHz, the conducted interference level in the power cord of
the tested equipment conforms to class "A" standard in EN55022 Table 1.
Radiated interference:
At frequency 150kHz~1000MHz, the radiated interference level of the power cord of
the tested equipment conforms to class "A" standard in EN55022 Table 1.
Reliability
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The MTBF value (which is the main representative of system reliability) of the power
supply subsystem is greater than 15%10
Burn-in test
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The power supply subsystem works in full load for 4 hours continuously at an
ambient temperature of 55!2âC and all its technical indices can still meet the
standard.
2.5.4 Power Supply Monitoring
The monitoring information of the whole power supply subsystem and each power
supply module is provided via the RS485 serial port on the backplane. Monitored
contents include:
1) Control value
Power supply module total shutdown control
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Power supply module auto startup/shutdown control
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2) Boolean value
Fan alarm signal
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Overheat alarm signal
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Output over-voltage alarm signal
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Input under-voltage alarm signal
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3) Current/ voltage analog signal
Output voltage (V )
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Output current (A)
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4) Interface
Power supply subsystem provides an RS485 port on the backplane, used to report
monitoring information to BCKM.
4
h.
2-54
System Description
2 Hardware Architecture
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