User`s manual

desired. Each time the operator changes modes, another 90-second listen-in/talk-
back period begins.
When the operator presses a button for the first time, and an alarm other than a silent
alarm triggered the listen-in/talk-back period, all Display Control Keypads set to
chime emit a listen-in/talk-back confirmation tone indicating that a monitoring service
operator is listening. The message “Voice Active” continues to appear on all Display
Control Keypads.
To change modes and begin another 90-second listen-in/talk-back period, the
monitoring service operator can:
l Press button 1 to turn on the one-way talk-back mode and begin
another listen-in/talk-back period. The monitoring service operator can talk to
someone at the premises. A person at the premises cannot talk to the
monitoring service operator. This mode is not available if the alarm that
triggered the original listen-in/talk-back period is a silent alarm.
l Press button 2 to turn on the two-way voice mode and begin
another listen-in/talk-back period. People at both locations can talk and hear
each other. This mode is not available if the alarm that triggered the original
listen-in/talk-back period is a silent alarm.
NOTE:
Under some circumstances, such as when there is excessive noise at the premises, Display
Control Keypads do not permit use of the two-way voice mode. To carry on a conversation, the
monitoring service operator must change between the one-way talk-back mode and the
one-
way listen-in mode.
l Press button 3 to turn on the one-way listen-in mode again and
begin another listen-in/talk-back period. The monitoring service operator can
hear people talking and listen to sounds at the premises, but
cannot talk to
people at the premises.
NOTE:
If the alarm that triggers the Listen-In/Talk-Back feature is a silent alarm, buttons 1, 2
and 3 do not change the listen-in/talk-back mode. When buttons
1, 2, or 3 are
pressed, the one-way listen-in mode continues and another 90-second listen-in/talk-
back period begins. The message “Voice Active” does not appear on the Display
Control Keypads, and the Display Control Keypads do not emit a listen-in/talk-back
confirmation tone. An intruder cannot know by looking at the Display Control
Keypads that an alarm has been sent.
EXAMPLE:
The monitoring service operator monitors receipt of an intrusion alarm on the receiver. The operator
picks up the phone connected to the receiver and hears the sirens at the premises. The operator
presses button 0 to turn off the sirens. Someone at the premises hears a listen-in/talk-back
confirmation tone at all Display Control Keypads. The message “Voice Active” appears on all Display
Control Keypads.
Then, the operator presses button 2 to turn on the two-way voice mode. The operator speaks to
someone at the premises and quickly determines that the person wants the police dispatched to the
AT&T Security System 8300 Installer’s Manual D-3