Perimeter protection is the type of protection that detects someone entering your home or building from the outside. Obviously, you enter through a door but intruders often use other means of entrance. For the best protection, you will need to protect any opening that can be used as an entrance. This will include not only doors, but also windows, ducts, and any other opening large enough for someone to go through.
The most common form of protection are "magnetic contacts" which are placed so that if a door or window is opened, a signal will be sent to the control panel and an alarm will results. Contacts may be either recessed, where the contact is usually mounted within the door or window casing and is hidden, or surface mounted. If you look at the top of the door in a retail store, you will usually see a surface mounted contact. Because door casings are steel and the walls are concrete, recessed contacts are difficult to mount in this type of building. Being open to vision, surface contacts can also be a deterrent.
Switches installed to all the exterior opening doors, windows, etc
What if only the glass is broken in a door or window and entrance is gained without opening the door or window? The magnetic contact will not detect a breach and will not signal an alarm. For this you will need a "glass break sensor" to signal the breach. Glass break sensors will detect either the acoustic, or sound of the glass breaking, the seismic, or feel of the glass breaking, or both.
Break glass or vibration sensors installed to detect breakage of windows
The last type of perimeter protection actually uses interior protectors. An "infrared detector" is set to form a virtual "barrier" along a wall instead of covering a large area. When someone passes through this barrier, an alarm will be set off.
External sensors such as photo-electric beams, special PIR sensors installed to detect intrusion at the perimeter of the property
Interior protection is the type of protection used to detect an intruder inside your home or building. Generally infrared detectors are used for this type of protection. There are two basic types of infrared detectors: ceiling mounted and wall mounted .
The most common detectors are the passive infrared (PIR) sensors which react to the infrared heat energy emitted by people. PIR sensors emit no radiation. They are passive and are normally designed to detect motion of a heat source.
A multifaceted (Fresnel) lens in front of the pyroelectric transducer focuses infrared energy from a multitude of narrow, discrete beams or cones. As a warm body moves across the field of view of the detector, the transducer output has peaks and valleys. If the variation is sufficiently intense and rapid, a circuit triggers and closes a relay. This relay provides the dry contact closure normally found on PIR detectors.
The customers ability to afford the cost involved with central station monitoring
Alarm Warning Devices
Communication systems When the alarm sensor activates, the panel will “seize” the telephone line and transmit a digital signal to the Central Monitoring Station receiver. The alarm information and required response information is displayed on a computer terminal for operator evaluation and action
Central Monitoring Station The receiver sends a handshake tone Panel now sends alarm data After successful reception, a “kiss off” tone is sent Sequence of Events - data transfer takes around 4.5 seconds Panel Dials the receiver