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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.
Celebration
Celebration is a census-designated place (CDP) and a master-planned community in Osceola County, Florida, United States, located near Walt Disney World Resort and originally developed by The Walt Disney Company. As part of theOrlando–Kissimmee Metropolitan Statistical Area, Celebration’s population was 7,427 at the 2010 census.[3]
Subsequent to founding Celebration, Disney followed its plans[4] to divest most of its control of the town. Several Disney business units continue to occupy the town’s office buildings, and two utility companies, Smart City Telecom and Reedy Creek Energy Services, both operated from Walt Disney World, provide services to the town. The town itself remains directly connected to the Walt Disney World resorts via one of its primary streets, World Drive, which begins near the Magic Kingdom.
Downtown Celebration’s post office was designed by Michael Graves, the adjacent Welcome Center is by Philip Johnson and the Celebration Health building by Robert A. M. Stern.[5] Other nearby buildings are designed by well known architects including: Charles Moore (Preview Center), Graham Gund (Bohemian Hotel), Cesar Pelli (movie theatre), Robert Venturi andDenise Scott Brown (SunTrust Bank).[6]
Response to Celebration has ranged from an early visitor who said it resembled the too-perfect town of “The Stepford Wives“[5]to those who see Celebration as an example of unabashed neo-urbanism.[7]