ADEMCO 7920SE Installation Instructions Manual page 38

While this 900 MHz Long Range Radio communications system is part of 'ar
advanced and sophisticated security system, it does not offer guarantee
protection against burglay or fire, nor does it guarantee communication 01
burglary or fire warning signals to a central station. Any alarm system, or any
communications system, whether commercial or residential, is subject tf
compromise, or failure to warn, for a variety of reasons. Examples of some o
these reasons are
~ Intruders may gain access through unprotected openings or have technics
sophistication to bypass an alarm sensor, and then disconnect an alarn
communicating radio transmitter.
~ Signals sent by 900 MHz radio transmitters may be blocked by metal,
mountains, hills, foliage and other natural and man made obstructions
before they are received by a master receiving station or sent to a centra
station. Even a path previously verified as acceptable may periodical!)
change its characteristics.
I Long-range radio communication transmitters will not work without power,
Radio transmitters require a battery to work properly in the absence of A.C.
power. A weak or dead battery, or improperly installed batteries may
prevent these devices from functioning properly if A.C. power is disrupted
for any reason.
Radio communication systems are subject to external interference, natural
or man-made, intentional or coincidental, that may keep a signal or group
of signals from being successfully received by a master receiving station of
a central station. In addition, one-way radio communication devices receive
no acknowledgment from a master receiving station that their signals are
being successfully received. Signals transmitted may clash with those
transmitted from other systems, While statistical estimates predict
successful operation, if the guidelines in the system manuals are followed,
the operation of this system is still probabilistic in nature and may be
subject to random signal failures.
Radio communication devices may change their characteristics over time.
Such parameters as frequency, modulation and power should be properly
monitored periodically, with required adjustments made by qualified
personnel.
Radio communication devices must be installed by qualified personnel.
Improper installation or selection of a transmitter's location may cause
intermittent or unreliable performance.
my electronic or mechanical device can fail. The most common cause of an
Iarm system or a radio communications system not functioning properly
/hen an intrusion or fire occurs is inadequate maintenance, maintenance
lat is intended to find such failures as soon as possible. This alarm and
ommunication system should be tested weekly to be sure all sensors and
ansmitters are working properly.
lstalling an alarm system may make one eligible for lower insurance rates,
ut an alarm system is not a substitute for adequate insurance. Homeowners,
roperty owners, business owners and renters should continue to insure their
rope rty and lives.
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