centralized extension system

Japanese: centralized extension system
centralized extension system

...private branch exchange (CES, short for centralized extension system). CES combines several private branch exchange functions into one exchange and also has a dial-in function that allows direct dialing from an outside line to an extension line. This is called a centrex or building telephone.

*Some of the terminology that refers to "centralized extension system" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…private branch exchangeの略)や事業所集団電話交換機(CES。centralized extension systemの略)がある。CESはいくつかの構内交換機能を一つの交換機に集合するとともに,外線から内線へも直接ダイヤル接続できるダイヤルイン機能をもたせたもので,これをセントレックス,あるいはビル電話などと呼んでいる。…

※「centralized extension system」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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