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%.

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.

References in periodicals archive ?

44 data compression capability, which typically improves data compression by some 20% to 60% over the V.

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44 technique typically improves data compression between 20 and 60 percent beyond the existing V.

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34bis, and lower data modulations, complete with MNP5 and V.

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