V.42 modem error correction

What does it do?

The V.42 specification defines an error correcting protocol for PSTN modems, based on HDLC and LAP. This makes it similar to an X.25 link. A special variant of LAP, known as LAP-M, is defined in the V.42 specification. A means for modems to determine if the far modem supports V.42 is also defined.

How does it work?

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