Chapter 12: Configuring Emergency Transfer Relay (Etr); Etr Overview - Avaya G250 Administration

Chapter 12: Configuring Emergency Transfer Relay
This chapter provides information about configuring the G250/G350's Emergency Transfer
Relay (ETR) feature and contains the following sections:

ETR overview

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Setting ETR state
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Viewing ETR state
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ETR overview
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 is activated automatically. When ETR is
activated, the Avaya G250/G350 Media Gateway connects the fixed analog trunk port (3/1 in
the G250, 7/1 in the G350) to the first fixed analog line port (3/2 in the G250, 7/2 in the G350).
An outside telephone exchange can be connected to the trunk port and an analog telephone
can be connected to the line port. All calls are then directed by the analog relay between the
outside line and the analog telephone. A current-loop detection circuit prevents ongoing calls
from being disconnected when normal functioning resumes. If a call is in progress on LINE 1
when the problem ends, the call continues. The fixed trunk port (3/1 in the G250, 7/1 in the
G350) and analog line ports (3/2 and 3/3 in the G250, 7/2 and 7/3 in the G350) do not start to
operate until the active call ends.
When ETR is active and the G250/G350 has power, the ETR front panel LED is lit.
Note:
For information about how ETR interacts with SRS in the G250, see
Note:
Transfer Relay (ETR) in SLS mode
(ETR)
— an overview of the G250/G350's ETR feature
— instructions on how to set the ETR state
— instructions on how to display the ETR state
on page 81.
Emergency
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