AT&T System 75 8520T User Manual Page 110

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NOTE:
When the sirens are turned off during a listen-in/talk-back period, the system continues to
count down the time until the sirens are scheduled to time out.
If the sirens time out during the
listen-in/talk-back period, they do not turn on again when the monitoring service operator
presses button 9.
If the monitoring service operator does not begin another listen-in/talk-back period by
pressing buttons 1, 2, 3, or 7, the system automatically turns on the sirens again and
hangs up.
If the sirens time out during the listen-in/talk-back period they do not turn
on again when the system hangs up.
Summary of Touch-Tone Phone Buttons
Table D-l provides a summary of the touch-tone buttons used to control the Listen-In/
Talk-Back feature.
Table D-l. Summary of Touch-Tone Phone Keys
Press
0
TO
turn off external sirens
l
1
activate the one-way talk-back
modes
2
activate the two-way voice
mode
3
activate the one-way listen-in
mode
1,2
7
begin another 90-second listen-in/talk-back period’
9
hang up and turn on sirens again’
‘Pressing button 1, 2, 3, 7 or 0 begins a new listen-in/talk-back period.
2
If a silent alarm triggers the Listen-In/Talk-Back feature, pressing buttons 1, 2, or 3
has the same effect as pressing button 7. The mode does not change.
Incoming
Alarms
During a Listen-In/Talk-Back Period
If a new alarm is generated during a listen-in/talk-back period, the monitoring service
operator hears 8 tones to indicate that another alarm has been generated at the
premises.
If a new alarm is generated during the first 90-second listen-in/talk-back period and
before the monitoring service operator has pressed button 1, 2, 3, 7 or 0, the 8 tones
indicating a new alarm has been generated are not emitted on the line at this time.
Instead, the system waits until the monitoring service operator presses a button to
change listen-in/talk-back modes, begin another listen-in/talk-back period, or turn off
sirens. When the operator first presses button
1,
2, 3, 7 or 0, the system immediately
emits the 8 tones to let the operator know another alarm was generated.
AT&T Security System 8300 Installer’s Manual
D-5
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