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Telephone signaling interface
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Telephone signaling interface : ウィキペディア英語版
Telephone signaling interface

There are many interface standards between analog telephone central office equipment and customer-premises equipment. Single voice paths generally include analog audio connections, either a two-wire circuit or four-wire circuit plus signaling paths to indicate call progress and status information, such as ringing, answer supervision, etc. Some of the known interface types are
* FXO foreign exchange office
* FXS foreign exchange station
* DPO dial pulse originate
* DPT dial pulse terminate
* E and M signaling
* KS Kewlstart
* Loop start
* Ground start


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