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Posted by on June 13, 2005, 12:23 am
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WIRELESS alarm systems are unreliable, regardless the brand, during
Radio Frequency Interferences (known as RFI in the radio communication
world). The week point of wireless is the transmitter / receiver link
who can be muzzled and you will not know it, its not detected.
WIRED alarm systems can be defeated too but not with the same ease,
they offer a mechanical / difficult access safety of sensor data
transmission lines, each sensor has its "individual" wired data
transport connection. Cutting or shorting wires are detected and
alarmed.
Wireless data connections uses "one common" data transport media,
radio waves and all wireless sensors pass true that chain and can be
muzzled at ounce.
A wireless data link can be:
- Detected from the outside with a general coverage receiver, and
- Disturbed also from the outside with a transmitter.
This make a wireless alarm system a lot more VULNERABLE than a wired
one.
Are you living in the middle of nowhere (marked as a black spot on the
transmitter frequency distribution map)?
Don't assume that in your area your system will not be interfered at
a unexpected/random time due to transmitters in the vicinity.
Your system may be interference free on installation but nothing tell
you that this situation will last, no warning will show up when a
change occur.
Lets not talk about voluntary blocking of your system...
In my case a wireless headphone MUZZLED my alarm system for
MORE THAN ONE YEAR,
but a lot of other transmitters fulfil the requirement.
Some pretend that my system was crap but are unable to provide any
argument of why and to say why the actual RF receivers are better.
In my previous post (No 4) i have mentioned most transmitters who are
susceptible to produce RFI. Recall there are a lot of them..
Ask yourself the question, are you living in the middle of nowhere
with no radio com generated problems? Are missionaries still present
in your area?
Avoid wireless crap; it may lack to provide you important intruder
information the day you need it.
Paul
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