GLOSSARY122V.34An ITU-T standard that currently allows datarates as high as 28,800 bps.V.34+An enhancement to V.34 that enables datatransfer rates as high as 33,600 bps.V.42An ITU-T standard for modemcommunications that defines a two-stageprocess of detection and negotiation forLAPM error control.V.42 bisAn extension of ITU-T V.42 that defines aspecific data compression scheme for useduring V.42 connections.XmodemThe first of a family of error control softwareprotocols used to transfer files betweenmodems. These protocols are in the publicdomain and are available from many bulletinboard services.XON/XOFFStandard ASCII control characters used totell an intelligent device to stop/resumetransmitting data.YmodemAn error-checking protocol that can sendseveral files of data at a time in 1024-byte(1K) blocks. This protocol can use eitherchecksums or CRC for error checking.
