b'respond to incoming alarm signals and thendata. This is in contrast with analog follow appropriate dispatch procedures.communications. While analog communications Closing: See Armuse a continuously varying signal, a digital transmission can be broken down into discrete Control Panel: The central computer or brainsmessages. Transmitting data in discrete of a security system. Every sensor on themessages allows for greater signal processing security system reports back to the controlcapability. The ability to process a panel with supervisory signals and alarmcommunication signal means that errors caused signals. A control panel can be connected with aby random processes can be detected and central monitoring station by many differentcorrected. Digital signals can also be sampled alarm communication paths making it ainstead of continuously monitored and multiple monitored security system.signals can be multiplexed together to form one signal. Because of all these advantages, and A control panel is normally installed in a laundrybecause recent advances in wideband room, closet, or garage. For hardwired securitycommunication channels and solid-state systems, the control panel typically is located inelectronics have allowed scientists to fully a beige metal box. Inside the box are therealize these advantages, digi-com has grown systems circuit board, power supply, and back- quickly. Digi-com is quickly making analog up battery. For wireless security systems, thecommunication extinct because of the vast control panel looks more like a standard keypaddemand to transmit computer data and the so that you can arm and disarm your securityability of digital communications to do just that. system right from the control panel. Detector: Any alarm device that can beDigital Subscriber Line (DSL): A family of technologies that provides digital data connected to a security system to providetransmission over the wires of a local telephone notification of an alarm event to the controlnetwork. DSL can be used at the same time and panel. Door/window contacts, motionon the same telephone line with regular detectors, glass break detectors, and smoketelephone transmissions, as it uses high detectors are some of the most commonfrequency, while telephones uses low detectors found on a security system.frequency. Alarm communications can be Digital Cellular Communicator: A digitaltransmitted over DSL but it requires a special electronic device that provides a cellularfilter to prevent interference between the two connection between a security system and asimultaneous frequencies. central monitoring station. TheseDisarm: The act of turning your security system communicators have built-in SIM cards andoff, so that it will no longer detect an alarm utilize existing wireless networks. A cellularevent. communicator sends alarm signals from the security system to the central monitoringDispatch: The act of calling in an alarm event to station without the need for a POTS line. At thethe proper authorities. Central station same time, cellular communication is muchoperators are the ones typically doing the more reliable than phone line communicationdispatch. because there is no wire exposed and availableDo-It-Yourself (DIY) Security: With the recent for phone line tampering.advances in wireless security system Digital Communication (Digi-Com): Often calledtechnology, a professional hardwired digital transmission. Refers to the field ofinstallation is no longer needed. Because of this, study concerned with the transmission of digitalthe DIY security market has emerged, and it is 80'