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Glossary

Revision as of 19:48, 19 December 2005 by Paul (talk | contribs)

Class 1 
Class 1 fax modems are modems with extensions to their command sets that allow them to act as Group 3 fax machines. Class 1 fax modems leave almost all of the processing to the software. The official standard for Class 1 fax modems is EIA/TIA-578.
Class 1.0 
Extension of Class 1.0 that adds V.34 (SuperG3) high-speed fax capability.
Class 2 
Class 2 fax modems handle much of the processing previously done by the CPU. It took a very long time for Class 2 to be approved, however, so many fax modems were produced before the standard was official. Thus, Class 2.0 is used for fax modems which apply strictly to the standards, while Class 2 applies to those fax modems that were produced before the standard was official.
Class 2.1 
Extension of Class 2.0 that adds V.34 (SuperG3) high-speed fax capability.


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