S000239E Fax Developer’s Guide

PublishTime：2022-05-11

●This document summarizes the fax Service Class 2 and Service Class 2.0/2.1 command sets as implemented in Multi-Tech Systems, Inc., MultiModems. All Multi-Tech modems support Class 2 fax commands. Some support Class 2.0. Some support Classes 2.0 and 2.1. To determine which command classes your modem supports, query the modem with the +FCLASS=? command (see section 2.2.2 of this manual). It is assumed that users are familiar with ITU-T Recommendation T.32, including Amendment 1, and have an understanding of ITU-T T.30 and T.4 concepts. ITU-T documents can be purchased from the ITU at http://www.itu.int/publications/index.html.
●The Service Class 2.0 command set applies to facsimile communications at speeds up to 14 400 bits per second (bps). The Service Class 2.1 command set is a modification of the Class 2.0 command set for facsimile communications at V.34 speeds up to 33 600 bits per second (bps), as documented in ITU-T T.32 Amendment 1. Because the two command sets differ only in subparameter values for a few Class 2.1 commands, they are treated here as a single Class 2.1 command set with differences noted as appropriate.
●The Multi-Tech implementation of Class 2.1 follows ITU-T Recommendation T.32 as amended, except for a few subparameter values. Again, differences are noted as appropriate.
●This document also summarizes the Multi-Tech implementation of the Service Class 2 command set, which was based on EIA proposed standard TIA-592 (August, 1990). EIA/TIA documents can be purchased from Global Engineering Documents at http://global.ihs.com/.
●Please note that the Class 2 and Class 2.0 commands though similar in outline are sometimes quite different in detail. Class 2 is a proposed early version of Class 2.0 that was never approved, but was widely implemented by modem manufacturers. As a result, all implementations of Class 2 are non-standard and manufacturer-specific. Class 2.0 is the version of Class 2 that was approved by the ITU after substantial changes to the original proposal. Major changes include a shortening of command names to three characters, a change from decimal values to hexadecimal values, the elimination of some commands, and the addition of others.
●This document is organized so that Class 2 commands are described with and compared to the equivalent Class 2.1 commands.

Brand of Product：	Multi-Tech Systems
Part#：	S000239E More Part#
Product Category：	Fax More
Application：	More
Data Type：	User's Guide More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	2010/5/18
Version Number：	Revision E
Data Encoding：
Data Size：	389 KB

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