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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.
Lebanon
Lebanon /ˈlɛbnən/ is the county seat of Wilson County, Tennessee, United States.[4]
The population was 26,190 at the 2010 census, 28,608 in 2013 and 32.372 following a special census conducted in 2016[5].
Lebanon is located in Middle Tennessee, approximately 25 miles (40 km) east of downtown Nashville. Lebanon is part of the Nashville Metropolitan Statistical Area.
The city was incorporated in 1801,[6] and was named after the biblical cedars of Lebanon.[7] Local residents have called Lebanon “Cedar City”, mostly a reference to the abundance of cedar trees in the area. The city is home to Cumberland University, a small, private four-year liberal arts institution.
As of the census[2] of 2000, there were 20,235 people, 7,987 households, and 5,319 families residing in the city. The population density was 692.0 people per square mile (267.2/km²). There were 8,693 housing units at an average density of 297.3 per square mile (114.8/km²). The racial makeup of the city was 82.89% White, 13.78% African American, 0.33% Native American, 0.82% Asian, 0.03% Pacific Islander, 1.00% from other races, and 1.15% from two or more races. Hispanic or Latino of any race were 2.26% of the population.
There were 7,987 households out of which 30.9% had children under the age of 18 living with them, 47.7% were married couples living together, 15.0% had a female householder with no husband present, and 33.4% were non-families. 28.5% of all households were made up of individuals and 11.1% had someone living alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.94.