Installation and Operations Manual
AT&T Proprietary (Internal Use Only)
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9 Local Power Failure and Low Battery Warnings
As was noted previously, the DLC Cabinet is equipped with a 24 hour battery backup
capability and will continue to operate under local power failure conditions for 24 hours.
When operating under a local power failure condition, the AC POWER LED on the DLC
Cabinet will be OFF. In addition, the battery system and wireless broadband LEDs will flash
simultaneously.
Under normal operating conditions the Proprietary 915MHz Two-Way devices, including the
Keypad, Siren and Repeater, receive power from AC-to-DC power conversion, but they are
equipped with 24 hour battery backup and will continue to operate for 24 hours under a
local power failure condition. All three devices are equipped with customer replaceable
batteries.
When operating under a local power failure condition, all of the Proprietary 433MHz One-
Way sensor/detector devices will continue to operate as designed and are not impacted by
a local power failure condition. Under normal operating conditions the Proprietary 433MHz
Repeater and Takeover Module receive power from AC-to-DC power conversion, but they
are equipped with 24 hour battery backup and will continue to operate for 24 hours under a
local power failure condition. They are equipped with customer replaceable batteries.
When the Digital Life System (DLS) is operating under a local power failure condition or a
device within the DLS has a low battery and the battery needs to be replaced, the
keypad(s) is used to provide a visual and auditory warning that the DLS is operating under
a local power failure condition and/or that a battery within a device(s) needs to be replaced.
Table 3 contains the messages that are presented in the keypad LCD. When the messages
are displayed the keypad starts chirping. As indicated in the table a user can silence the
chirping pressing the # key on the keypad. Once chirping commences, the keypad will chirp
for half (0.5) a second every minute as long as the condition persists. The chirping is
automatically silenced on a daily basis from 9:00 PM local time until 9:00 AM local time. If
an event triggering chirping occurs during the twelve (12) hour silent period, then the
chirping will begin once the silent period has concluded. If a user does not silence chirping
before the silent period begins, then the chirping will continue until the user presses the #
key to silence the chirping.
Table 3 contains local power failure and low battery warnings that may appear on the
keypad LCD in conjunction with keypad chirping.
