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trunked radio system : ウィキペディア英語版
trunked radio system

A trunked radio system is a complex type of computer-controlled two-way radio system that allows sharing of relatively few radio frequency channels among a large group of users. Instead of assigning, for example, a radio channel to one particular organization at a time, users are instead assigned to a logical grouping, a "talkgroup". When any user in that group wishes to converse with another user in the talkgroup, a vacant radio channel is found automatically by the system and the conversation takes place on that channel. Many unrelated conversations can occur on a channel, making use of the otherwise idle time between conversations. Each radio transceiver contains a microcomputer to control it. A control channel coordinates all the activity of the radios in the system. The control channel computer sends packets of data to enable one talkgroup to talk together, regardless of frequency.
The primary purpose of this type of system is efficiency; many people can carry many conversations over only a few distinct frequencies.〔Talk groups, scanning, and group calls are defined in, "Section 2: Needs Summary," ''Arizona Phase II Final Report: Statewide Radio Interoperability Needs Assessment,'' Macro Corporation and The State of Arizona, 2004, pp. 16.〕 Trunking is used by many government entities to provide two-way communication for fire departments, police and other municipal services, who all share spectrum allocated to a city, county, or other entity.
==Principles of operation==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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