<HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <TITLE> Class 2 Modem Support </TITLE> </HEAD> <BODY> <BASEFONT SIZE=4> <B><FONT SIZE=+3>C</FONT>LASS 2 <FONT SIZE=+2>M</FONT>ODEM <FONT SIZE=+2>S</FONT>UPPORT</B> <BASEFONT SIZE=3> <HR SIZE=4> The system includes a driver for modems that conform to TIA/EIA-592 draft SP-2388-A of August 30, 1991. Unfortunately, because this was only a draft, there are many modems that claim to conform to this document, but which diverge in sometimes subtle ways. <P> The Class 2 driver has been extensively tested with a wide variety of Class 2 modems. The software attempts to work around many incompatibilities and mistakes in modem firmware. A common problem that requires special attention is that some modems are incapable of accepting an <TT>AT+FDIS</TT> command to set the session parameters between the time a call is placed and a page is transmitted. Modems with this sort of problem may ignore the <TT>AT+FDIS</TT> command which causes incorrect session parameters being used to interpret the page data (often resulting in ``squished pages''), or abort the session, returning a <TT>+FHNG:</TT> status message to the host. If you encounter this problem use the <TT>Class2DDISCmd</TT> configuration parameter to enable workaround support in the fax server; e.g. <UL><TT> <PRE>Class2DDISCmd: AT+FDIS</PRE> </TT></UL> <!--FOOTER--> <P> <A HREF="toc.html"><IMG SRC="icons/back.gif"> HylaFAX table of contents</A>.<BR> <HR> <ADDRESS> <A HREF="sam.html">Sam Leffler</A> / <A HREF="mailto:sam@engr.sgi.com">sam@engr.sgi.com</A>. Last updated $Date: 1998/10/12 20:47:51 $. </ADDRESS> </BODY> </HTML>
