<HTML ><HEAD ><TITLE >Internal modems</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Remote Serial Console HOWTO" HREF="index.html"><LINK REL="UP" TITLE="Modem configuration" HREF="modem.html"><LINK REL="PREVIOUS" TITLE="Configure modem with AT commands" HREF="modem-hayes.html"><LINK REL="NEXT" TITLE="WinModems" HREF="modem-dsp.html"></HEAD ><BODY CLASS="SECTION" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Remote Serial Console HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="modem-hayes.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 12. Modem configuration</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="modem-dsp.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECTION" ><H1 CLASS="SECTION" ><A NAME="MODEM-INTERNAL" ></A >12.4. Internal modems</H1 ><P >An internal modem is basically an external modem and serial port mounted upon a <SPAN CLASS="ACRONYM" >PC</SPAN > bus card. These are cheaper than external modems as they do not require a power supply or a chassis.</P ><P >Internal modems work fine for remote serial console applications. They are especially attractive for computers at co-location sites, as those sites charge according to space and power consumption.</P ><P >Check that your internal modem preserves its setting across a power cycle.</P ><P >Ensure that the interrupt line and port address space used by the internal modem's serial port do not conflict with that used by any other pre-existing serial ports. Alternatively, ensure that the internal serial port can be disabled, freeing its interrupt line and port address space for use by the internal modem.</P ><P >Be careful not to confuse an internal modem with a WinModem. An internal modem does not need a special device driver, but appears to <SPAN CLASS="SYSTEMITEM" >Linux</SPAN > as a stardard serial port.</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="modem-hayes.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="modem-dsp.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Configure modem with <SPAN CLASS="ACRONYM" >AT</SPAN > commands</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="modem.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >WinModems</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
