The Interchange circuit reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Interchange circuit

In telecommunication, an interchange circuit is a circuit that facilitates the exchange of data and signaling information between data terminal equipment (DTE) and data circuit-terminating equipment (DCE).

An interchange circuit can carry many types of signals and provide many types of service features, such as control signals, timing signals, and common return functions.

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