Reference Manual

Diagnostics and Fault Handling
Interface. The RBS equipment is seen as a
set of MOs by the BSC. (This is a way of
describing the RBS in a functional-
oriented way. A logical model of the RBS
in terms of MOs is built in the BSC). All
O&M actions are based on this logical
model structure created in the BSC.
An MO does not necessarily have a one-
to-one relation with a physical unit in the
RBS and the MO comprises either both
hardware and software or software only.
RU Replaceable Unit. An RU is the smallest
unit that can be handled on site or in a
repair center and of which information can
be retrieved via OMT or BSC.
SE Supervised Entity. It is the lowest level in
the RBS hardware model. A SE is a
property, which is supervised. Examples
on SEs are communication fault on a bus
and interruption on a PCM reference.
SO Service Object. A SO is an abstract
subclass of MO. A SO instance carries
service functions for a set of MO
instances, including itself. The service
functions include Layer 2 termination and
Layer 3 distribution. They may also
include HW supervision and SW handling.
47.3 Fault Detection
Purpose
This function detects hardware and functionality faults in the RBS
system. The RBS always supervises itself, even without traffic.
Preconditions and initiation
The selftest and supervision function has detected a disturbance.
Description
The fault detection function is processed by the following subfunctions;
fault filtering, fault evaluation and fault classification. These
subfunctions are described below in detail. The types of faults that are
detected are specified within the context of “Selftest and Supervision”.
378 (485)
EN/LZT 720 0008 P2A
2001-11-28
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