Reference Manual

Diagnostics and Fault Handling
41 Diagnostics and Fault Handling
"Diagnostics and Fault Handling" supervises the handling of faults and
disturbances detected by the "Selftest and Supervision" function.
Fault handling performs the following:
•
Filters spurious disturbances. (Disturbances are events which may
indicate a fault only under certain conditions)
• Evaluates the underlying fault cause
• Determines the impact of a fault
• Localizes faults to an offending RU
• Attempts to minimise the effect of a fault
• Reports any change in fault status of an MO to the BSC
• Maintains logs of faults
41.1 References
Whenever a reference is made to a function described in another chapter,
please refer to the table of contents to find the appropriate chapter.
Maintenance functions related to Diagnostics and Fault Handling are
described within the context of Operation and Maintenance Terminal.
The visual indicators relevant to Diagnostics and Fault Handling are
described within the context of Operation and Maintenance Support.
41.2 Concepts
AO Application Object. An AO is an abstract
subclass of MO. AO provides a part of the
functionality of a GSM BTS. The
functionality is specified for each concrete
descendant class. An AO instance has
O&M communication with BSC on Layer
3 via a SO instance.
Disturbance An event which may indicate a fault only
under certain conditions.
Fault map Information about a ME fault status is
stored in fault maps capable of indicating
the presence or absence of all possible
faults for a ME.
HWU An Hardware Unit (HWU) consists of one
or more SEs. An HWU is a functional
unit within the RBS. The HWU is either
active (equipped with a processor) or
passive (without a processor).
ME Managed Entity. A HWU, RU, SO or AO.
MO Managed Object. The BSC manages the
O&M of the RBS via the A-bis O&M
EN/LZT 720 0008 R1A
2001-06-26
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