176 lines
2.9 KiB
HTML
176 lines
2.9 KiB
HTML
<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
|
|
> |