Two-way radio
Two-way radio messaging systems, also known as acknowledge-back paging systems, utilize low-power transmitters in the portable subscriber units to transmit messages and acknowledgments to the base receivers of the system using an inbound channel. Personal Radio Service (PRS) is the name applied by the Federal Communications Commission Wireless Telecommunications Bureau to cover a broad array of two-way (or, walkie-talkie) type radio services. Included under the PRS moniker are radio services such as the so-called 218 219 MHz service, the Citizens Band (CB) radio service, the Family Radio Service (FRS), the General Mobile Radio Service (GMRS), the Low Power Radio Service (LPRS), the Medical Implant Communications Service (MICS), the Radio Control Radio Service, and the Wireless Medical Telemetry Service. Two-way radios have become popular communication tools where phones or other communication methods are not cost effective or simply not efficient. These 2-way radios generally allow users to communicate with one another without experiencing interruptions caused by other users, such as the case with citizen band radios. Two-way systems advantageously provide confirmation of message delivery, as well as automatic retry upon a failure of a message delivery attempt. In addition, two-way systems allow users of portable subscriber units to originate as well as receive messages. As standard equipment such radios incorporate a hand-held microphone having a "press-to-talk" transmission switch that must be manually activated to transmit a message. Such radios also typically include a scanning feature. In the scan mode of operation; the radio scans through all or a programmed group of the multiple channels so as to allow the monitoring of communications taking place. Portable two-way radios are becoming more advanced in both form and function. Today, portable two-way radios are being used to communicate with extremely complicated communication systems which automatically switch operating frequencies and signalling protocols. Such systems typically provide display message capabilities as well as automatic interface to land-based telephone interconnect systems.
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