Link Access Procedure for Modems

Link Access Procedure for Modems (LAPM) is part of the V.42 error correction protocol for modems.

LAPM is an error control protocol defined in ITU-T recommendations V.42. Like many data link layer protocols, it is a variant of HDLC. Like the Microcom Networking Protocols that preceded it, LAPM uses cyclic redundancy checking (CRC) and retransmission of corrupted data (ARQ) to ensure data reliability.