8(42)
Datum/Date Rev
Dokumentnr/DocumentnrUppgjord/Prepared
Dokansv/Godkänd - Doc respons/Approved Kontr/Checked Tillhör/Referens-File/Reference
1999-07-15 F
1545-ASB 150 02 Uen
FAULT TRACING DESCRIPTION
Faktaansvarig - Subject responsible
2 Fault locating
2.1 General checks on start and completion of service
Start by identifying the type of fault by collecting as much information about the fault as possible, from
the relevant customer, then (if possible) connect RASC and check the configuration of the PBX with re-
gard to revision states (see point 4.15, Translation and verification of revision states) as soon as this is
possible.
The majority of faults can probably be eliminated from the O&M-centre by means of reprogramming or
via telephone contact with the respective customer (operational faults).
Consider to which one of the following main fault categories best describes your fault:
Use the following flow charts describing a methodical path for checks and tests to help locate and
eliminate the fault. When the flow charts lead to a possible cause, this is indicated by a statement giving
the name of the defective part or the cause of the problem, e.g. a defective BTU-_ board is indicated by
the statement `BTU-_ board defect'. When there are more possible items, they are listed in order of
decreasing probability.
Number TYPE OF FAULT Go to:
2.2 Indication of LEDs on board(s) page 10
2.3 No call procedures possible in the PBX page 15
2.4 Individual board not working page 16
2.5 A single individual does not work at all, e.g. an extension is "dead".
The individual is not able to either initiate or receive calls
page 17
2.6 Digital trunk (BTU-D) does not work at all page 19
2.7 Individual malfunctions partly, intermittent faults, e.g. one connection case is successful
and another fails. The fault can be traced to an individual
page 20
2.8 A certain facility never functions. A certain facility is inaccessible, e.g. intrusion is never
possible
page 21
2.9 A certain facility functions intermittently, that is a certain connection case succeeds on one
occasion, not on another, and where the fault cannot be traced to an individual
page 22
2.10 An individual has no access to a certain facility page 22
2.11 Transmission fault (one way speech, line scratching, etc.) page 23
2.12 PBX unstable (repeated restarts) page 24
2.13 Faults related to Cordless page 25
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