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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.
Bronxville
Bronxville /ˈbrɒŋksvɪl/ is a suburban village in Westchester County, New York, located about 15 miles (24 km) north of midtown Manhattan.[3] It is part of the town of Eastchester. The village comprises 1 square mile (2.5 km2) of land in its entirety, approximately 20% of the town of Eastchester. As of the 2010 U.S. census, Bronxville had a population of 6,323.[4] As of 2014, it was ranked 18th in the state in median income.[5]
Millionaire real-estate and pharmaceutical mogul William Van Duzer Lawrence sparked the development of Bronxville as an affluent suburb of New York City with magnificent homes in a country-like setting.[6] The area, once known as “Underhill’s Crossing”, became “Bronxville” when the village was formally established. The population grew in the second half of the 19th century when railroads allowed commuters from Westchester County to work in New York City.[6] Lawrence’s influence can be seen throughout the community, including the historic Lawrence Park neighborhood, the Houlihan Lawrence Real Estate Corporation, and Lawrence Hospital. John F Kennedy, the president of the United States, also resided here for a time.[7]
The village was home to an arts colony in the early 20th century during which time many noteworthy houses by prominent and casual architects were built.[8] After the Bronx River Parkway was completed in 1925, the Village expanded rapidly with the construction of several apartment buildings and townhouses much of it built by the Lawrence family. As of 1959, they continued to own or manage 97% of the rental market.[9] In both rentals and ownership, the village discouraged and effectively prohibited Jewish residency, earning the name “The Holy Square Mile.”[9]