250 lines
4.2 KiB
HTML
250 lines
4.2 KiB
HTML
<HTML
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><HEAD
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><TITLE
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>Cable from console port to modem</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="Serial cabling"
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HREF="serial.html"><LINK
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REL="PREVIOUS"
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TITLE="Jargon"
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HREF="serial-jargon.html"><LINK
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REL="NEXT"
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TITLE="Cable from console port to terminal (or another PC)"
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HREF="serial-pc-terminal.html"></HEAD
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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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WIDTH="10%"
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HREF="serial-jargon.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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>Chapter 11. Serial cabling</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="serial-pc-terminal.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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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="SERIAL-PC-MODEM"
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></A
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>11.2. Cable from console port to modem</H1
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><P
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>The <SPAN
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CLASS="ACRONYM"
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>RS-232</SPAN
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> standard defines the
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interconnection of computers and modems, so there is little to go
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wrong here by simply purchasing a pre-assembled cable. There are
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two types of cable: cables with connectors for a standard 25-pin D
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connector on the computer; and cables with connectors for a
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proprietary 9-pin D connector used on the <SPAN
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CLASS="ACRONYM"
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>IBM</SPAN
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>
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<SPAN
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CLASS="PRODUCTNAME"
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><SPAN
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CLASS="ACRONYM"
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>PC/AT</SPAN
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></SPAN
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> and many other
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computers. The cables have titles like
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<I
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CLASS="CITETITLE"
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><SPAN
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CLASS="ACRONYM"
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>RS-232</SPAN
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> 25-pin computer
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(<SPAN
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CLASS="ACRONYM"
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>DTE</SPAN
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>) to 25-pin modem
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(<SPAN
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CLASS="ACRONYM"
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>DCE</SPAN
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>)</I
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> or
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<I
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CLASS="CITETITLE"
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><SPAN
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CLASS="ACRONYM"
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>RS-232</SPAN
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> 9-pin <SPAN
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CLASS="ACRONYM"
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>IBM</SPAN
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>
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<SPAN
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CLASS="PRODUCTNAME"
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><SPAN
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CLASS="ACRONYM"
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>PC/AT</SPAN
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></SPAN
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> computer
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(<SPAN
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CLASS="ACRONYM"
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>DTE</SPAN
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>) to 25-pin modem
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(<SPAN
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CLASS="ACRONYM"
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>DCE</SPAN
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>)</I
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>. Most modems are packaged
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with a suitable cable.</P
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><P
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>If you need to manufacture your own cables, see the
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<I
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CLASS="CITETITLE"
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>Serial-HOWTO</I
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> for the
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<SPAN
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CLASS="ACRONYM"
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>RS-232</SPAN
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> pinout for your computer. Connect
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Transmit Data on the computer to Transmit Data on the modem,
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Receive Data on the computer to Receive Data on the modem, and so
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on for Signal Ground, Clear to Send, Ready to Send, Data Set Ready,
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Data Terminal Ready and Data Carrier Detect.</P
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><P
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>For professional computer room installations consider routing
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the serial cable through an <SPAN
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CLASS="ACRONYM"
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>RJ-45</SPAN
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> patch panel.
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There are two common pinouts on used on the
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<SPAN
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CLASS="ACRONYM"
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>RJ-45</SPAN
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> connector: <A
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HREF="http://yost.com/Computers/RJ45-serial/"
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TARGET="_top"
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>Yost</A
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> and
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<A
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HREF="http://www.cisco.com/warp/public/701/14.html"
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TARGET="_top"
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>Cisco
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2500-series</A
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>.</P
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><P
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>If you create your own pinout for unshielded twisted pair
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cable then be sure that your pinout twists a Signal Ground wire
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with the Transmit Data wire and another Signal Ground wire with the
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Receive Data wire. Although the <SPAN
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CLASS="ACRONYM"
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>RS-232</SPAN
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> signals
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are not balanced, this twist will result in the least amount of
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signal degradation and noise pickup.</P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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ALIGN="LEFT"
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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="serial-jargon.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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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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><A
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HREF="serial-pc-terminal.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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>Jargon</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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HREF="serial.html"
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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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>Cable from console port to terminal (or another PC)</TD
|
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></TR
|
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></TABLE
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></DIV
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> |