Complete Protocol dictionary, glossary and reference

LAP-D: Link Access Procedure, D-Channel

Link Access Procedure, D-Channel (LAP-D), a Layer 2 protocol in the ISDN suite, is used to do call setup and other signaling over the D Channel. Data transmissions take place on B channels. LAP-D is almost identical to the X.25 LAP-B protocol. LAPD is defined in the ITU Q.921 protocol.

Standard Organization

ITU-T

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