Reference Manual

Diagnostics and Fault Handling
Preconditions and initiation
The fault detection function and the fault localization function reports
new fault status for a MO. Both functions must have been completed
before start of this function.
Description
The RBSs automatically informs the BSC of each change in the fault
status. The old fault status is compared with the new fault status. If the
fault status has changed for MO, a fault report procedure is initiated on
A-bis. A certain fault can be detected and reported by several MOs.
The BSC may request the current fault status for a specified MO at any
time.
41.7 Fault Logging
Purpose
All fault changes are logged in the SW log with timestamp.
Preconditions and initiation
A fault has been raised or ceased by the fault filtering function and fault
classification function.
Description
All changes in the fault status of the RBS are logged in a software log.
The software log is distributed on the RUs. A log entry is stored in the
RU where the fault is detected. The software log is stored in volatile
memory.
41.8 RBS Diagnostics
Purpose
The purpose of this function is to make conclusions about where the
original fault source is located.
Preconditions and initiation
The fault detecting function has reported a change in fault status for a
HWU.
Description
The diagnostics function has access to fault maps for the whole RBS,
not only for a MO. The RU fault map has information about which
information SE(s) that has reported a fault. If there is any fault at the
RBS, this function will switch on "BS Fault Indicator". If this function
can pinpoint the fault to a RU with 100% probability, it will switch on
the Fault Indicator on that RU. If the fault affects functionality and the
RU is not in remote mode then the Operational Indicator on the RU will
be switched off.
320 (421)
EN/LZT 720 0008 R1A
2001-06-26
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