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User Manual
Airbridge cBTS3612 CDMA Base Station
When faults occur to software, certain automatic error-correction function will be
executed, including restarting and reloading.
The BTS system also provides manual and automatic re-initialization of different
levels, and supports the reloading of configuration data files and board execution
programs.
VIII. Fault tolerance
When faults occur, the system usually will not be blocked, as the BTS system
provides the E1 connection in conformity with the IMA protocol, and has certain line
backup capabilities.
The boards of important devices in the system have been backed up, ensuring that
the BTS system can switch the service from the faulty board to a normal board, or
perform reconfiguration of the system.
The system will make a final confirmation on a hardware fault through repeated
detection, thus avoiding the system reconfiguration or QoS deterioration due to
contingent faults.
IX. Thermal design
The influence of temperature on the BTS system has been considered in the design
of the system. Thermal design primarily concerns the selection of components,
circuit design (including error tolerance, drift design and derating design), structure
design and heat dissipation, so that the BTS system can work reliably in a wide
range of temperatures.
The first consideration in thermal design is to balance the heat distribution of the
system. Corresponding measures are taken in the place where heat is more likely to
be accumulated.
X. Maintainability
The purpose of maintainability design is to define the workload and nature of the
maintenance, so as to cut the maintenance time. The main approaches adopted
include
improvement which can simplify the product maintenance work.
XI. EMC design
The design ensures that cBTS3612 will not degrade to an unacceptable level due to
the electromagnetic interference from other equipment in the same electromagnetic
environment. At the same time, cBTS3612 will not cause other equipment in the
standardization,
modularization,
error
prevention,
1-22
System Description
1 System Overview
and
testability
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