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User Manual
Airbridge cBTS3612 CDMA Base Station
same electromagnetic environment to degrade to an unacceptable level due to the
EMI from it.
XII. Lightning protection
To eliminate the probability of lightning damage on the BTS system, proper
measures are taken in the following three aspects:
Lightning protection for DC power supply
l
Lightning protection for BTS trunk lines
l
Lightning protection for antenna and feeder system
l
For details, please refer to "2.7 Lightning Protection System".
1.5.2 Software Reliability Measures
Software reliability mainly includes protection performance and fault tolerance
capability.
I. Protection performance
The key to improve software reliability is to reduce software defects. Software
reliability of BTS is ensured in the whole process from system requirement analysis,
system design to system test.
Starting from the requirement analysis, software development process goes under
regulations such as CMM (Capability Mature Mode), which aim to control faults in
the initial stage.
In software design, much attention is devoted to the designing method and
implementation: the software is designed in a modular structure, and in a loose
coupling mechanism. When a fault occurs to one module, other modules will not be
affected. In addition, preventive measures such as fault detection, isolating and
clearing are also important in improving the system reliability. Other effective
methods include code read-through, inspection, and unit test.
Various software tests are necessary to improve the software reliability. Test
engineers participate the whole software develop process, from unit test to system
test. They make plans strictly compliant with the demand of the upper level flow,
which ensure the improvement of software reliability. Additionally, test plans are
improved with the tests and become more and more applicable.
II. Fault tolerance capability
Fault tolerance capability of the s oftware system means that the whole system
would not collapse when a minor software fault occurs, i.e. the system has the
1-23
System Description
1 System Overview
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