General - What is V.42?

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WHAT IS V.42?
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V.42 is an international error correction standard for modems.  When V.42 is 
active during a given modem connection, data errors introduced within the 
connection itself (e.g., line noise) will be automatically and transparently 
compensated for, in other words, "corrected."  

V.42 is similar to MNP Class 4.  In fact, because the V.42 standard includes 
MNP compatibility through Class 4, all MNP-4 compatible modems can establish 
error-controlled connections with V.42 modems.  This standard, however, 
prefers to use its own better performing protocol, called LAPM (Link Access 
Procedure for Modems).  LAPM, like MNP, copes with phone line impairments by 
automatically re-transmitting data that is corrupted during transmission
assuring that only error free data passes through the modems.  Many modem 
manufacturers make MNP Class 4-compatible modems, and some offer V.42-
compatible modems as well. 

Keep in mind that in order for V.42 error correction to work, the standard 
must be present and enabled in the modems at both ends of a given connection.  
Most modems sold today include V.42 error correction. 

- END -
ESOFT002
Rev. 10/90

Revised 10/93
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