Nortel Networks DCT1900 - Manual (Page 361)

Technical Product Manual - DCT1900
Maintenance, Fault Signalling
Maint-DCT1900/R8/mw 3-1
© 2000-2005
C HAPTER 3
Fault Signalling
3.1 Introduction
This chapter describes how maintenance personnel or system managers are informed about faults
in the DCT1900 system. Faults are signalled to the outside world in the following ways:
General Alarm/Service Message
System Screen of CSMW software
Individual user complaints
Common user complaints
Alarms to MS (Mobility only)
Furthermore, LEDs and the service display of the Portable Telephone are discussed. Although
they cannot be taken as fault signaling devices, they can help diagnose faults.
3.2 General Alarm/Service Message
When the CPU has classified a fault as "service" (persistent faults), a general alarm is raised, see
Chapter 2, Paragraph 2.2. Upon a general alarm, a general alarm signal is activated and a "fault"
report is written in the service table, which can be read by the CSMW software. The fault report
indicates the type of fault, type of board, location and time and date. The format of a fault report
and a list of fault codes can be found in Chapter 4.
The local system manager or maintenance engineer is informed about a general alarm in three
ways:
General alarm signal
"System Service Required" message on the PC–screen when the CSMW software is running
Alarm message to the MS
LED 5 on the CPU will also be turned on in the case of a general alarm. However, it may also
be on as a result of an "info" or "fault" error table entry.
General Alarm Signal
The general alarm signal from a CPU is routed via the general alarm cable to the MCCB where it
activates a general alarm relay. Via this make/break relay contact, a lamp or a buzzer or any other
type of alarm device can be activated. The alarm signalling can be cleared by selecting from the
CSMW menu bar System-Reset-Alarm Relay.
"System Service Required"
When the PC is running the CSMW software, a pop–up window containing the message "System
Service Required" appears on the PC screen as soon as the general alarm is activated. If CSMW
software is started after the occurrence of a general alarm, the "System Service Required"
message will not appear on the screen. The general alarm signal is the only warning.
Alarm Message
When a fault is classified as "service" and posted in the service table, an alarm message is sent to
the MS which enables remote monitoring of the operational state of a DCT1900 system. This
capability is only applicable in the Mobility configuration.