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101

U.S. Robotics I-modem Command Reference

Glossary • Page G-26

LAPD

See Link Access Procedure for the D-channel.

LAPM

See Link Access Procedure for Modems.

Link Access Procedure for the D-channel (LAPD)

An error control protocol incorporated in ITU-T Recommendation I.440 and I.441.

Link Access Procedure for Modems (LAPM)

Link Access Procedure for Modems, an error control protocol incorporated in ITU-T Rec-

ommendation V.42. Like the MNP and HST protocols, LAPM uses cyclic redundancy

checking (CRC) and retransmission of corrupted data (ARQ) to ensure data reliability.

local echo

A modem feature that enables the modem to send copies of keyboard commands and

transmitted data to the screen. When the modem is in Command mode

(not online to

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