V.42bis
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%.
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V.42bis
An ITU standard (1989) for analog modem data compression. It uses the BTLZ technique to achieve up to a 4:1 ratio. V.42bis implies the V.42 error checking protocol.Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.