This was normally addressed by using a modem-level error correction protocol, like Microcom Networking Protocols.
2.
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.
3.
The ITU-T V . 42 LAPM procedure is considered more robust than the Microcom Networking Protocols ( MNP ) that preceded it, and has a more sophisticated and powerful data compression option in V . 42bis, allowing much greater data throughput.
मोबाइल