192 lines
4.4 KiB
HTML
192 lines
4.4 KiB
HTML
<HTML
|
|
><HEAD
|
|
><TITLE
|
|
>A Serial NULL Modem Cable</TITLE
|
|
><META
|
|
NAME="GENERATOR"
|
|
CONTENT="Modular DocBook HTML Stylesheet Version 1.57"><LINK
|
|
REL="HOME"
|
|
TITLE="Linux Network Administrators Guide"
|
|
HREF="index.html"><LINK
|
|
REL="UP"
|
|
TITLE="Useful Cable Configurations"
|
|
HREF="x-087-2-appendix.cables.html"><LINK
|
|
REL="PREVIOUS"
|
|
TITLE="A PLIP Parallel Cable"
|
|
HREF="x-087-2-cable.plip.html"><LINK
|
|
REL="NEXT"
|
|
TITLE="Linux Network Administrator's Guide, Second Edition Copyright Information"
|
|
HREF="x-087-2-appendix.gpl.html"></HEAD
|
|
><BODY
|
|
CLASS="SECT1"
|
|
BGCOLOR="#FFFFFF"
|
|
TEXT="#000000"
|
|
LINK="#0000FF"
|
|
VLINK="#840084"
|
|
ALINK="#0000FF"
|
|
><DIV
|
|
CLASS="NAVHEADER"
|
|
><TABLE
|
|
WIDTH="100%"
|
|
BORDER="0"
|
|
CELLPADDING="0"
|
|
CELLSPACING="0"
|
|
><TR
|
|
><TH
|
|
COLSPAN="3"
|
|
ALIGN="center"
|
|
>Linux Network Administrators Guide</TH
|
|
></TR
|
|
><TR
|
|
><TD
|
|
WIDTH="10%"
|
|
ALIGN="left"
|
|
VALIGN="bottom"
|
|
><A
|
|
HREF="x-087-2-cable.plip.html"
|
|
>Prev</A
|
|
></TD
|
|
><TD
|
|
WIDTH="80%"
|
|
ALIGN="center"
|
|
VALIGN="bottom"
|
|
>Appendix B. Useful Cable Configurations</TD
|
|
><TD
|
|
WIDTH="10%"
|
|
ALIGN="right"
|
|
VALIGN="bottom"
|
|
><A
|
|
HREF="x-087-2-appendix.gpl.html"
|
|
>Next</A
|
|
></TD
|
|
></TR
|
|
></TABLE
|
|
><HR
|
|
ALIGN="LEFT"
|
|
WIDTH="100%"></DIV
|
|
><DIV
|
|
CLASS="SECT1"
|
|
><H1
|
|
CLASS="SECT1"
|
|
><A
|
|
NAME="X-087-2-CABLE.SERIAL"
|
|
>B.2. A Serial NULL Modem Cable</A
|
|
></H1
|
|
><P
|
|
>
|
|
|
|
A serial null modem cable will work for both SLIP and PPP. Again, you
|
|
will need two DB-25 connectors. This time your cable requires only
|
|
eight conductors.</P
|
|
><P
|
|
>You may have seen other NULL modem cable designs, but this one allows you
|
|
to use hardware flow control—which is far superior to XON/XOFF
|
|
flow control—or none at all. The conductor configuration is
|
|
shown in <A
|
|
HREF="x-087-2-cable.serial.html#X-087-2-CABLE.NULLMODEM.DIAGRAM"
|
|
>Figure B-2</A
|
|
>:</P
|
|
><P
|
|
>Again, if you have a shield, you should connect it to the first pin at one
|
|
end only.</P
|
|
><DIV
|
|
CLASS="FIGURE"
|
|
><A
|
|
NAME="X-087-2-CABLE.PLIP.DIAGRAM"
|
|
></A
|
|
><P
|
|
><B
|
|
>Figure B-1. Parallel PLIP cable</B
|
|
></P
|
|
><P
|
|
><IMG
|
|
SRC="lag2_ab01.jpg"></P
|
|
></DIV
|
|
><P
|
|
>                                 
|
|
                                 
|
|
                                 
|
|
                                 
|
|
                                 
|
|
                                  </P
|
|
><DIV
|
|
CLASS="FIGURE"
|
|
><A
|
|
NAME="X-087-2-CABLE.NULLMODEM.DIAGRAM"
|
|
></A
|
|
><P
|
|
><B
|
|
>Figure B-2. Serial NULL-Modem cable</B
|
|
></P
|
|
><P
|
|
><IMG
|
|
SRC="lag2_ab02.jpg"></P
|
|
></DIV
|
|
><P
|
|
>                                 
|
|
                                 
|
|
                                 
|
|
                                 
|
|
                                 
|
|
                                  </P
|
|
></DIV
|
|
><DIV
|
|
CLASS="NAVFOOTER"
|
|
><HR
|
|
ALIGN="LEFT"
|
|
WIDTH="100%"><TABLE
|
|
WIDTH="100%"
|
|
BORDER="0"
|
|
CELLPADDING="0"
|
|
CELLSPACING="0"
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="x-087-2-cable.plip.html"
|
|
>Prev</A
|
|
></TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="index.html"
|
|
>Home</A
|
|
></TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="x-087-2-appendix.gpl.html"
|
|
>Next</A
|
|
></TD
|
|
></TR
|
|
><TR
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="left"
|
|
VALIGN="top"
|
|
>A PLIP Parallel Cable</TD
|
|
><TD
|
|
WIDTH="34%"
|
|
ALIGN="center"
|
|
VALIGN="top"
|
|
><A
|
|
HREF="x-087-2-appendix.cables.html"
|
|
>Up</A
|
|
></TD
|
|
><TD
|
|
WIDTH="33%"
|
|
ALIGN="right"
|
|
VALIGN="top"
|
|
>Linux Network Administrator's Guide, Second Edition Copyright Information</TD
|
|
></TR
|
|
></TABLE
|
|
></DIV
|
|
></BODY
|
|
></HTML
|
|
> |