AT&T System 25 - Manual (Page 175)

SYSTEM TESTS
TEST EMERGENCY TRANSFER
Place the system in emergency transfer mode by turning power off (or
remove the modular connector from the ETU). Place an outside call from
each emergency transfer station.
1.
2.
3.
4.
5.
6.
7.
8.
At Cabinet 1, turn the power off using the rocker switch on the back
or remove the modular connector from the ETU.
For ground start trunks, at an emergency transfer voice terminal, go
off-hook. Press the ground start key, if so equipped.
For loop start trunks, go off hook at an emergency transfer terminal.
You should hear dial tone.
Dial a incoming trunk wired for emergency service.
You should hear a ringback
ringing at the called station.
may be to the calling station
At the called station, go off-hook and
tone at the calling terminal and
If a busy tone is heard, the call
verify transmission.
At both emergency transfer stations, go on-hook.
Repeat Steps 2 through 5 for each emergency transfer station,
including the ones you have just rung, to ensure that you can place
as well as receive a call from each.
At Cabinet 1, turn power on using the rocker switch on the back, or
replace the modular connection into the ETU.
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