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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.
East Lansing
East Lansing is a city in the U.S. state of Michigan directly east of Lansing, the state capital. Most of the city is within Ingham County, with the rest in Clinton County. The population was 48,579 at the 2010 census, an increase from 46,420 in 2000. It is best known as the home of Michigan State University.
East Lansing was an important junction of two major Native American groups: the Potawatomi and Fox.[6] By 1850, the Lansing and Howell Plank Road Company was established to connect a toll road to the Detroit and Howell Plank Road, improving travel between Detroit and Lansing, which cut right through what is now East Lansing. The toll road was finished in 1853, and included seven tollhouses between Lansing and Howell.[7]
Michigan State University was founded in 1855 and established in what is now East Lansing in 1857. For the first four decades, the students and faculty lived almost entirely on the college campus. A few commuted from Lansing, and that number increased when a streetcar line was built in the 1890s, but there were few places to live in the then-rural area immediately around the campus.
That started to change in 1887, when professors William J. Beal and Rolla C. Carpenter created Collegeville, along what is now Harrison Road and Center and Beal Streets, north of Michigan Avenue. Few faculty were attracted to the location, and the first residents were “teamsters and laborers”.[8] In 1898, the College Delta subdivision (including what is now Delta Street) had the support of the college itself, which provided utilities, and several professors built homes there (one of which survives today at 243 W. Grand River Ave.).[9] Other subdivisions followed.
At that time, the post office address was “Agricultural College, Michigan.” A school district encompassing the nascent community was created in 1900. In 1907, incorporation as a city was proposed under the name “College Park”; the legislature approved the charter but changed the name to “East Lansing.” The first seven mayors, starting with Clinton D. Smith in 1907 and Warren Babcock in 1908, were professors or employees of the college.