For D Channel we have terms and definitions in 2 topics. The topics are Technology and Telco.

D Channel (Technology)

the ISDN 16-kb/s data channel that is used for out-of-band signaling functions such as call setup

D Channel (Telco)

Data Channel or Delta Channel (depending on who you ask). The channel which handles ISDN network related data between the user's equipment and the Telco switch. Used to carry data to set up calls and receive calls. Some Telco's also allow users to use the D channel to access the packet data network, with appropriate terminal equipment.

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