An extension of the ITU-TV.42 standard modemprotocol to included compression using a Lempel-Ziv related technique, which detects frequentlY occurring character strings and replaces them with tokens. This is similar to the Unixcompress utilitY. TYpical compression for text is 50% or better with nearlY 20% gain from sYnchronous conversion this gives reduces transmission time bY almost 60%. [Details? On-line spec?] (2004-08-02)