Line Transfer - Nortel Communication Server 1000E Maintenance Manual

54 Hardware maintenance tools
Table 14
Causes of major and minor alarms
Alarm Cause
Major
CPU or control bus failure
Program failure when attempting to load the system
System power faults
Temperature fault (excessive heat)
Minor
Conference failure
Digitone receiver failure
More than one fault on different cards in one MG 1000E (indicated on affected
customer console only)
Serial Data Interface failure
Memory failure
Network failure (indicated on affected console only)
Peripheral signaling failure
Tone and digit switch failure
External alarms
A remote alarm, in the context of general maintenance, is the extension
of a major alarm to another location or to an audible or visual indicator.
The system generates a signal that indicates a major alarm condition and
sends the alarm signal to a remote location, such as a monitoring center or
test center, or to an indicator, such as a light or bell.

Line transfer

As an option, connect one or more PFTUs to the MG 1000Es. Each PFTU
connects designated analog (500/2500-type) telephones to Central Office
trunks. If call processing stops, those analog (500-2500-type) telephones
are transferred through the PFTU to the Central Office so the outside
connections are still available. A line transfer occurs:
•
during a sysload (system reload)
•
if there is a major power failure
•
if call processing stops due to a Call Server failure
Nortel Communication Server 1000
Communication Server 1000E Maintenance
NN43041-700 04.01 4 June 2010
Copyright © 2004-2010 Nortel Networks. All Rights Reserved.