General This Recommendation describes a lossless data compression procedure for use with V-series data circuit-terminating equipment (DCEs). The principal characteristics of the data compression procedure are: a) a compression procedure based on an algorithm that encodes strings of characters input from data terminal equipment (DTE) as binary codes of variable length; b) a decoding procedure that recovers the strings of characters from received binary codes of variable length; c) a string-building mechanism that rapidly extends existing strings; d) an automatically invoked transparent mode of operation when uncompressible data are detected. Annex B describes the implementation of this data compression procedure in packet networks. A summary of the set of parameters used in this Recommendation is given in clause 8. Clause I.7 summarizes the main differences between the algorithms of ITU-T V.44 and V.42 bis. This Recommendation contains examples for illustrative purposes; in any case in which an example appears to contradict the normative text@ the normative text shall take precedence.