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resources & technical support:/home/modem standards/data compression
 
V.42bis Allows up to 4:1 data compression V.42bis modems also usually include V.42 error correction.

MNP-5 Allows up to 2:1 data compression. Relies on MNP-2 through MNP-4 for error correction.

The fastest communications route is always in what is known as direct mode. Every stage of compression, error correction and buffering causes a time delay.

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