Line Transfer; External Power Loss - Nortel 1000E Maintenance Manual

56 Hardware maintenance tools
Alarm Cause
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:
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External power loss

You can connect reserve (backup) power supplies to the system, that is,
uninterruptible power supplies (UPS) for AC-powered systems. If the main
source of external power is lost, power to the system is maintained by the
UPS.
Copyright © 2007, Nortel Networks
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during a sysload (system reload)
if there is a major power failure
if call processing stops due to a Call Server failure
if there is a loss of power to the MG 1000E
if there is a loss of power to the PFTU
if a line transfer switch on the attendant console is turned on
Nortel Communication Server 1000
Communication Server 1000E Maintenance
NN43041-700 01.02 Standard
Release 5.0 20 June 2007