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D-channel
Last modified: Thursday, September 19, 2002 

Short for Delta-channel, the channel in an ISDN connection that carries control and signaling information. Basic Rate ISDN (BRI) service consists of two 64 Kbps B-channels, and one D-channel for transmitting control information. Primary ISDN service consists of 23 B-channels (in the U.S.) or 30 B-channels (in Europe).

Compare with B-channel.

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ISDN

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B-channel

channel

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