Thanks guys.
Colin


>From: William Chops Westfield <westfw@MAC.COM>
>
>On Tuesday, Apr 20, 2004, at 12:49 US/Pacific, David VanHorn wrote:
>
>Well, cisco use the following on their terminal servers and console
>ports and other things with rs232 on rj45...
>
>CTS
>DSR
>RD
>Rd GND (on some platforms Rx is differential receiver.  Otherwise gnd)
>GND
>TD
>DTR
>RTS
>
>Which end is which depends :-)
>
>The theory goes as follows:
>
>1) In theory, you can plug in a 4 wire rj11 and get your basic three
>    wire connection.  With 6 wires in the middle, you get that plus modem
>    control.  Add the two output pins for HW flow control as well.  When
>    we first put this together, HW flow control was somewhat less common
>    that the need for modem control.  (Hmm.  That was the cisco-500,
>    circa 1991.  Just about the time v.32 modems were showing up.)
>
>2) Reverse DTE/DCE-ness by using a "flipped" cable (unfortunately common
>    in the telco world.)  The symmetry makes it easier to remember, too.
>
>3) IIRC, the center 6 pins are compatible with an old DEC standard.
>
>4) All the inputs on one side, all the outputs on the other.  Goes with
>    the 'easier to remember' part.
>
>On the minus side, I'm told that if you plug these into standard
>building wiring, inappropriate signals end up in the same twisted pairs.
>
>There's a good resource at http://www.conserver.com/consoles/
>
>BillW
>
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