A wireless communication method in which multiple frequencies (channels) are shared by many users. It is called a multi-channel access system. It uses radio waves in the 800MHz frequency band. The communication range through one relay station is 20-40km, but nationwide wide-area communication is also possible through relay stations installed throughout Japan. When communication begins, the control station has the function of automatically selecting an available channel. In addition to being used in business, such as the transportation, manufacturing, sales, and service industries, it is also used in firefighting and disaster prevention, taking advantage of its disaster-resistant characteristics. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
複数の周波数(チャンネル)を多数の利用者が共用する無線通信方式。マルチチャンネルアクセスシステムと呼ばれる。800MHz帯の周波数の電波を使用する。一つの中継局を通じた通話可能範囲は 20~40kmだが,日本全国に設置された中継局を介して全国広域通信も可能。通信開始時に,制御局が空いているチャンネルを自動的に選択する機能がある。運輸業,製造・販売業,サービス業など業務に利用されるほか,災害に強い特性をいかして消防,防災にも利用されている。
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