From: "Bill" 
Newsgroups: misc.consumers.house
Subject: Re: your feedback on DIY security alarm system
Date: Tue, 8 Aug 2006 09:41:26 -0700

> What do these zones mean and what are advantages of having zones?
>

Alarms will malfunction sometimes. Have false alarms. It is easier to track 
down the problem if sensors are on different zones. The alarm company will 
get a code which says which zone tripped.

Also fire sensors are on a different zone. When the signal is sent, the 
alarm company can tell if it is fire, burglary, etc. Some have medical 
alerts on a separate zone. Also they can detect a burglar moving around in a 
building if sensors are on many zones. A door trips, then a motion sensor, 
then an interior door, etc. An alarm system can send multiple alarms as 
sensors are tripped.

Also wireless is cheaper to install, but the batteries can cost a small 
fortune over many years. Might be less expensive over the long run to 
install a wired system.