Maintenance Principles; Maintenance Model - Northern Telecom DMS-100 Series Manual

Maintenance principles

Maintenance model

Figure 2-1 illustrates the basic maintenance model that DMS VoiceMail
uses. The most common maintenance states are shown (that is, inservice,
out-of-service, and faulty) while transient states (such as, pending, loading,
etc.) are not shown.
Figure 2-1
DMS VoiceMail maintenance model
An inservice component (such as a node, card, or connection) is put in the
out-of-service state if the disable command is used. If a component fails, it
is automatically put in the faulty state by the system.
Disable
Out-Of-Service
Diagnostics
Pass
DMS VoiceMail Trouble-locating and alarm-clearing procedures SPM 02
InService
Enable
Diagnostics
Pass
Diagnostics
Fail
Component
Fails
Faulty
Diagnostics
Fail
2-1