Signaling Channel
The signaling channel (D) uses Q.931 for signaling with the other side of the link.
Read more about this topic: Integrated Services Digital Network
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“The Xanthus or Scamander is not a mere dry channel and bed of a mountain torrent, but fed by the ever-flowing springs of fame ... and I trust that I may be allowed to associate our muddy but much abused Concord River with the most famous in history.”
—Henry David Thoreau (1817–1862)
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