Chapter 12: Emergency Transfer Relay
(ETR)
Emergency Transfer Relay (ETR)
The ETR feature provides basic telephone services in the event of system failure, such as a
power outage or a failed connection to the MGC. ETR services are offered on installed
MM714B media modules. When ETR is activated, the G430 connects the MM714B’s trunk port
5 to line port 4. All calls are then directed by the analog relays between the outside lines and
the analog telephones. A current-loop detection circuit prevents ongoing calls from being
disconnected when normal functioning resumes. If a call is in progress on an outside line when
the problem ends, the call continues.The trunk port and analog line port do not start to operate
until the active call ends.
You can install an MM714B media module in any slot (1-3, 5-8).When ETR is active and the
Branch Gateway has power, the ETR LED is lit.
Related topics:
ETR state configuration on page 299
Summary of ETR commands on page 300
ETR state configuration
By default, ETR is set to go into effect automatically in the event of power outage or a failed
connection to the MGC. You can activate and deactivate ETR manually using the CLI.
Related topics:
Activating ETR manually on page 299
Deactiving ETR manually on page 300
Restoring ETR to automatic activation on page 300
Activating ETR manually
About this task
Use this command only for testing.
Administering Avaya G430 Branch Gateway October 2013 299
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