View source for 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 [[Integrated Services Digital Network|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==
* http://www.protocols.com/pbook/pdf/isdn.pdf
* http://www.itu.int/rec/T-REC-Q.920/en
* http://www.itu.int/rec/T-REC-Q.921/en

[[Category:Link access protocols]]



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