Link Access Procedures, D channel
In Integrated Services Digital Network (ISDN) telecommunications, Link Access Procedures, D channel is part of the network's communications protocol, which ensures that messages are error-free and executed in the right sequence.
LAPD is the second layer protocol on the ISDN protocol stack in the D channel (the ISDN channel in which the control and signalling information is carried).
LAPD standards are specified in ITU-T Q.920 and Q.921. Its development was heavily based on High-Level Data Link Control.
External links
- PROTOCOLS.COM
- Q.920 : ISDN user-network interface data link layer - General aspects
- Q.921 : ISDN user-network interface - Data link layer specification
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