5 common user complaints, 7 leds – Nortel Networks DCT1900 User Manual

Page 364

Technical Product Manual - DCT1900

Maintenance, Fault Signalling

3-4

Maint-DCT1900/R8/mw

Before any part of the system is suspected, it should be made clear that no handling faults have
occurred. Typical handling faults are:

Portable Telephone out–of–range, battery empty or Portable Telephone not switched on.
"Hook flash" set on (if applicable), causing difficulties in going on or off hook.
Audio and ringing volume too low.
"Ringing" switched off.
Improper handling of unit, damage due to dropping or inserting battery improperly.

3.5

Common User Complaints

Common user complaints are similar complaints received from several users at the same time.
Somehow these complaints have a common source and fault finding is based on finding that
common aspect:
Faults occurring in same area

: A Base Station may be suspected.

Blocking calls

: Lack of resources in SPCs (SPUs and/or SLUs) or air capacity.

Lost calls

: During an inter system handover calls may get dropped due to

an improper PWT air interface synchronization of the systems
involved.

3.6

Alarms to Mobility Server (DCT1900 Mobility Configuration Only)

To inform the MS about its operational state, the DCT1900 system can send the following alarms:
Alarm1

: System start–up ready, system is available.

Alarm2

: Non serious fault detected.

Alarm3

: Serious fault detected. The general alarm signal is raised and a

service message is generated. Also, it is possible that calls are
not handing over to a base station because of improper time
delay values. May relate to "fault occurring in same area."

3.7

LEDs

LEDs can be found on all system boards and Base Stations. Those LEDs may not and cannot be
taken as alarm signalling devices because they are usually out-of-sight. However, sometimes they
may give additional information to maintenance personnel.

All system boards have four identical LEDs at the top, except the DTU board which has two rows
of four LEDs. The CPU board is equipped with two extra LEDs. Base Stations have two LEDs. An
explanation is given of those LEDs below.