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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.
Johnstown
Johnstown is a city and the county seat of Fulton County in the U.S. state of New York. As of the 2010 Census, the city had population of 8,743.[1] The city was named after its founder, Sir William Johnson.[2]
The city of Johnstown is mostly surrounded by the town of Johnstown, of which it was once a part when it was a village. Also adjacent to the city is the city of Gloversville. The two cities are together known as the “Glove Cities”. They are known for their history of specialty manufacturing. Johnstown is located approximately 45 miles (72 km) west of Albany, about one-third of the way between Albany and the Finger Lakes region to the west.
Johnstown, originally “John’s Town”, was founded in 1762 by Sir William Johnson, a Baronet who named it after his son John Johnson.[3] William Johnson came to the British colony of New York from Ireland in 1732.[4] He was a trader who learned American Indian languages and culture, forming close relationships with many Native American leaders. He was appointed as the Superintendent of Indian Affairs, as well as a major general in the British forces during the French and Indian War (Seven Years’ War). His alliances with the Iroquois were significant to the war.
As a reward for his services, Johnson received large tracts of land in what are now Hamilton and Fulton counties. He established Johnstown and became one of New York’s most prosperous and influential citizens. He was the largest landowner in the Mohawk Valley, with an estate of more than 400,000 acres (1,600 km2) before his death. Having begun as an Indian trader, he expanded his business interests to include a sawmill and lumber business, and a flour mill that served the area. Johnson, the largest slaveholder in the county and perhaps in the state of New York, had some 60 enslaved Africans working these businesses. He also recruited many Scots-Irish tenant farmers to work his lands.[5] Observing Johnson’s successful business endeavors, the local Native American inhabitants dubbed him Warragghivagey, or “he who does much business.”[6]