190 lines
3.0 KiB
HTML
190 lines
3.0 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Modem hangs up upon reboot</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Remote Serial Console HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Bugs and annoyances"
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HREF="bugs.html"><LINK
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REL="PREVIOUS"
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TITLE="BIOSs, keyboards and video cards"
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HREF="bugs-video.html"><LINK
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REL="NEXT"
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TITLE="init and
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syslog output does not display on
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secondary consoles"
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HREF="bugs-monitor.html"></HEAD
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><BODY
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CLASS="SECTION"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Remote Serial Console HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="bugs-video.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Appendix A. Bugs and annoyances</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="bugs-monitor.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="BUGS-REBOOT"
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></A
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>A.4. Modem hangs up upon reboot</H1
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><P
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>During reboot the serial controller is reset. This drops the
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modem control line Data Terminal Ready. This in turn instructs the
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modem to hang up.</P
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><P
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>Avoid the temptation to configure the modem to ignore
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<SPAN
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CLASS="ACRONYM"
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>DTR</SPAN
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>. This leads to a worse bug, where the
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telephone line does not clear down correctly, the modem is engaged,
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and there is no way to clear it. Ignoring <SPAN
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CLASS="ACRONYM"
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>DTR</SPAN
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>
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also gives no way to clear hostile callers from the line.</P
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><P
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>You may wish to record the amount of time that the computer
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takes from <TT
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CLASS="COMPUTEROUTPUT"
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>Restarting system</TT
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> to
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the boot loader prompt.</P
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><P
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>The modem may also hang up during the boot process (as the
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serial chip is reset) or when the <SPAN
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CLASS="APPLICATION"
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>init</SPAN
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>
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run level is changed (as <SPAN
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CLASS="APPLICATION"
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>getty</SPAN
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> is
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restarted).</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="bugs-video.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><A
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HREF="bugs-monitor.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
|
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ALIGN="left"
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VALIGN="top"
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><SPAN
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CLASS="ACRONYM"
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>BIOS</SPAN
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>s, keyboards and video cards</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="bugs.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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VALIGN="top"
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><SPAN
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CLASS="APPLICATION"
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>init</SPAN
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> and
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<SPAN
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CLASS="APPLICATION"
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>syslog</SPAN
|
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> output does not display on
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secondary consoles</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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> |