DBS3900 V300R008
Product Description
Issue 04 (2008-06-11)
Commercial in Confidence
Page 30 of 46
6.2.2 Hardware Reliability of the RRU
Reliability Design for Power Supply
The RRU3004 operates within a wide voltage range. In DC power input, the RRU can
operate in the range –36 V DC to –57 V DC, which means that the system can run
undamaged even the peak voltage reaches –57 V DC.
Over-Temperature Protection
When the internal temperature of the RRU is too high due to ambient factors, the
system automatically enables the auto protection function to reduce power or to shut
down power amplifiers, depending on the severity. When the ambient temperature
comes back to normal, the system automatically disables this function.
6.3 Software Reliability
The DBS3900 software has a very high error tolerance. The whole system does not
break down even if the software fails. This means that the system has the capability of
self-healing. The following describes the error tolerance of the BBU and RRU3004
software.
6.3.1 Regular Check on Key Resources
Seizure check is conducted on various software resources in the system. If a resource
failure occurs due to software faults, the check mechanism can ensure the release of
suspended resources and the output of the related logs and alarms.
6.3.2 Parameters Check
Software checks all parameters contained in the LMT/OMC commands to ensure their
validity. The validity of the data in the data configuration file is also checked when the
system is started. This ensures normal operating of the system. When the software is
active, any possible fault in the software or hardware is monitored. The detected faults
are reported. Task status and system abnormalities can also be monitored.
6.3.3 Software Failure Protection
Locally, the base station saves two software releases and data releases. If a fault
occurs during the software upgrade, the system automatically rolls back to the
previous version. This greatly increases the success rate of software downloading
and makes remote maintenance more practical.
6.3.4 Data Check
In terms of data check, the system performs the following functions: checking data
consistency on a regular or event-driven basis, restoring data consistency selectively
or preferably, and outputting related logs and alarms.
