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A security alarm[1] is a system designed to detect intrusion – unauthorized entry – into a building or area. Security alarms are used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders. Car alarms likewise protect vehicles and their contents. Prisonsalso use security systems for control of inmates.
Some alarm systems serve a single purpose of burglary protection; combination systems provide both fire and intrusion protection. Intrusion alarm systems may also be combined with closed-circuit television surveillance systems to automatically record the activities of intruders, and may interface to access control systems for electrically locked doors. Systems range from small, self-contained noisemakers, to complicated, multi-area systems with computer monitoring and control.
The most basic alarm consists of one or more sensors to detect intruders, and an alerting device to indicate the intrusion. However, a typical premises security alarm employs the following components:
- Premises control unit (PCU), Alarm Control Panel (ACP), or simply panel: The “brain” of the system, it reads sensor inputs, tracks arm/disarm status, and signals intrusions. In modern systems, this is typically one or more computer circuit boards inside a metal enclosure, along with a power supply.
- Sensors: Devices which detect intrusions. Sensors may be placed at the perimeter of the protected area, within it, or both. Sensors can detect intruders by a variety of methods, such as monitoring doors and windows for opening, or by monitoring unoccupied interiors for motions, sound, vibration, or other disturbances.
- Alerting devices: These indicate an alarm condition. Most commonly, these are bells, sirens, and/or flashing lights. Alerting devices serve the dual purposes of warning occupants of intrusion, and potentially scaring off burglars. These devices may also be used to warn occupants of a fire or smoke condition.
- Keypads: Small devices, typically wall-mounted, which function as the human-machine interface to the system. In addition to buttons, keypads typically feature indicator lights, a small multi-character display, or both.
- Interconnections between components. This may consist of direct wiring to the control unit, or wireless links with local power supplies.
- Security devices: Devices to detect thieves such as spotlights, cameras & lasers.
In addition to the system itself, security alarms are often coupled with a monitoring service. In the event of an alarm, the premises control unit contacts a central monitoring station. Operators at the station see the signal and take appropriate action, such as contacting property owners, notifying police, or dispatching private security forces. Such signals may be transmitted via dedicated alarm circuits, telephone lines, or Internet.
Collierville
Collierville is a town in Shelby County, Tennessee, United States, and a suburb located in the Memphis metropolitan area. The town had a population of 43,965 at the 2010 census.[5]
Collierville is a town of large houses and considerable retail expansion. Smaller, older houses are still found in the heart of Collierville, mainly between Byhalia Road and Collierville-Arlington on the east and west and Shelton and Highway 72 on the north and south. Some industry, notably Pepsi and Carrier, still dots the areas located south of Poplar Avenue.
Collierville is home to the Avenue at Carriage Crossing, an 800,000+ sq ft shopping center which opened in October 2005. Baptist Hospital, Collierville, serves the medical needs of the town’s residents. Collierville will become part of the Interstate 69 highway plan integrating Bill Morris Parkway (SR 385) as Interstate 269, part of this USDOT project linking Canada and Mexico with the United States.
Collierville was chosen as one of Relocate-America’s Top 100 Places to Live in 2008.[6] In 2014, Collierville’s historic town square was ranked by Parade Magazine as the “Best Main Street” in America.[7]