Step 6: Installing An 808A Emergency Transfer Panel And Associated Telephones - Avaya G450 Installing And Upgrading

Connecting devices
Step 6: Installing an 808A Emergency Transfer Panel and
associated telephones
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. The ETR feature can be used in conjunction
with an analog media module (MM711, MM714, or MM716). The ETR panel provides up to five
incoming Central Office (CO) trunk loops to 5 selected G450 analog lines. Thus, one ETR panel
supports up to five emergency lines. You can cascade a second ETR panel, providing support
for up to 10 emergency analog phones. ETR is activated automatically upon system failure by
closing the tip/ring contacts between the analog lines and the analog trunks. When ETR is
activated, all calls are 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 passing through the ETR panel do
not start to operate until the active call ends.
For information on installing the 808A Emergency Transfer Panel, see 808A Emergency
Transfer Panel Installation Instructions, 03-602518, which ships with the Emergency Transfer
Panel.
60 Installation and Upgrades for the Avaya G450 Media Gateway