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Link Access Procedures on the D channel (LAPD), specified in ITU-T Q.920 and ITU-T Q.921, is the second layer protocol on the ISDN protocol stack in the D channel.
It is heavily based on HDLC.
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
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