U.S. flag

An official website of the United States government, Department of Justice.

NCJRS Virtual Library

The Virtual Library houses over 235,000 criminal justice resources, including all known OJP works.
Click here to search the NCJRS Virtual Library

Basics of Alarm System Specification

NCJ Number
Security World Volume: 22 Issue: 1 Dated: (January 1985) Pages: 43-46
T S Kappinos
Date Published
4 pages
The specifications for alarm systems, including input, output, wireless, and derived channel devices for building perimeter and interior space protection are reviewed.
Control panels for alarm systems should provide zones and zoning, entry and exit delay, automatic bell cutoff, opening and closing signals, and remote arming and disarming. Rechargeable power supplies are essential. The local alarm should be a visible or audible indication, such as bell, siren, or flashing red light, that an intrusion has occurred in order to scare away the intruder and bring attention to the situation. Alarms should be mounted outside in plain view and out of reach. Remote, or silent, alarms transmit alarm information to other locations such as police department, guard house, or central stantion, usually over telephone lines. Since wires can be cut, wireless devices such as radio telemetry should be considered. Derived channel devices use regular telephone lines to transmit a steady scanning signal which the monitoring facility reads; interruptions in the signal indicate a security breach. Tabular data provide detailed information on interior space protection devices, including application, operation, false alarm potential, and advantages and disadvantages. The operational theories, applications, characteristics, and considerations for interior perimeter protection devices are also given in tabular form.