V42bis | Article about V42bis by The Free Dictionary
V.42bis (redirected from V42bis)
V.42bis (communications, standard)
An extension of the ITU-T V.42
standard modem protocol
to included compression
Lempel-Ziv related technique, which detects frequently
occurring character strings and replaces them with tokens.
This is similar to the Unix compress
for text is 50% or better; with nearly 20% gain
conversion this gives reduces transmission
time by almost 60%.
V.42bisAn 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.
References in periodicals archive
This gives modem connections to Gandalf's Xpressway Modem Resource Module (MRM) up to a 50 percent performance improvement when compared to standard V42bis
running on most commmercially available modems.