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User Manual
Airbridge cBTS3612 CDMA Base Station
1.4.8 Remote Maintenance Serial Port
Remote maintenance serial port is an RS-232 serial port, connected with PSTN via
an external Modem. It is used for emergency maintenance by dial-up with a Modem
when OML between OMC and BTS is interrupted.
1.4.9 Environment Alarm Interface
Environment alarm interface is an RS-485 serial port connected with the external
environment alarm collection box, performing a centralized monitoring to the
environment. A communication protocol defined by Huawei is used between BTS
and the environment alarm collection box. Therefore, supported environment alarm
collection box should be used for the BTS.
1.5 Reliability Design
Reliability design of a system is shown in the stability and reliability of the product
during operation.
Huawei cBTS3612 is designed based on reference to the following standards:
YD/T 1029-1999 800MHz General Technical Specifications of CDMA Digital
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Cellular Mobile Communication Network Equipment
YD/T 1030-1999 800MHz Technical Requirement for Interface of CDMA Digital
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Cellular Mobile Communication Network
TIA/EIA/IS-97D Minimum Performance Standard of CDMA Base Station
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Huawei product reliability design index and related technical specifications
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The design of boards is in strict accordance with the requirement of above
standards pertaining to reliability design, with measures taken to improve the
reliability. In addition, some key parts of the system are designed with redundancy
(such as active/standby mode and resource pool) to improve the reliability of the
system.
System reliability indices are:
MTBF: 100000 hours
MTTR: 1 hour
1-19
System Description
1 System Overview
A : 99.999%
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