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Security alarm
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== Wired, wireless, and hybrid systems== [[File:Installing a Magnetic Door Contact.JPG|thumb|upright|Installing a wireless magnetic contact breaker on a door]] The trigger signal from sensors are transmitted to one or more control units either through wires or wireless means, such as radio, line carrier, and infrared. Wired systems are convenient when sensors, such as passive infrared motion sensors and smoke detectors require external power to operate correctly; however, they may be more costly to install. Basic wired systems utilize a [[star network]] topology, where the panel is at the center logically, and all devices home run their line wires back to the panel. More complex panels use a [[Bus network]] topology where the wire basically is a [[dual loop|data loop]] around the perimeter of the facility, and has drops for the sensor devices which must include a unique device identifier integrated into the sensor device itself. Wired systems also have the advantage, if wired properly for example by dual loop, of being [[tamper-evident technology|tamper-evident]]. Wireless systems, on the other hand, often use battery-powered [[transmitter]]s which are easier to install and have less expensive start-up costs, but may fail if the batteries are not maintained. Depending on distance and construction materials, one or more wireless [[repeater]]s may be required to bring the signal to the alarm panel reliably. A wireless system can be moved to a new property easily. An important wireless connection for security is between the control panel and the monitoring station. Wireless monitoring of the alarm system protects against a burglar cutting cables or from failures of an internet provider. This setup is commonly referred to as fully wireless. Hybrid systems use both wired and wireless sensors to achieve the benefits of both. Transmitters can also be connected through the premises' electrical circuits to transmit coded signals to the control unit (line carrier). The control unit usually has a separate channel or zone for burglar and fire sensors, and more advanced systems have a separate zone for every different sensor, as well as internal trouble indicators, such as mains power loss, low battery, and broken wires.
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