3.0—Home Security and Surveillance Systems

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Chapter
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3
Equipment Functionality and Specifications
Each component of a home security and surveillance system has a specific
function to perform. The basic security system includes a control panel connected
by cables to sensors at various locations throughout the home. A
perimeter protection system must include sensors at every opening, including
doors, windows, garage doors and windows, and doors to crawl spaces. A
keypad is the device that provides a control interface for the residents to arm
and disarm the system using a programmed access code and also to monitor
the status of the system.
Door Functional Design Specifications
Doors are protected by installing small magnetic switches inside the frame.
Figure 3.1 illustrates the location of the magnetic switch. A magnet is
installed in the top of the door that keeps the switch contacts open as long
as the door remains closed. An alarm is caused when this switch is disturbed
by opening the door. The magnetic switch completes a circuit that is
connected to the control panel. Recessed mounted models use magnets that
are fitted into drilled holes, and when properly installed, recessed mounted
magnetic switches are hard to notice and blend in well with the door.
Figure 3.1 Magnetic door switch.
Window Functional Design Specifications
A perimeter security system must include a glass protection system because
magnetic switches do not protect against an intruder entering through a broken
window. Glass protection systems are available in two categories: vibration