V.42bis
<communications, standard> An extension of the
ITU-T V.42 standard
modem protocol 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
Unix compress 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?]