D channel
  • Abbreviation of delta channel, or data channel. In ISDN communications, a channel that serves to transmit control information such as that associated with packet switching, in addition to user-related data such as the identity of the calling party. Its bandwidth is usually 16 Kbps, but can be greater. It works alongside a B channel (2).
  • synonym data channel
  • synonym delta channel
  • A communications channel used for data transmission. Also called information channel.
  • A path along which input/output data is transmitted. Also called I/O channel.

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