Has anyone used the spare pairs in an Ethernet cable for the purpose of
getting an RS-232 connection to some remote device?  I have a Soekris on
a 50' tower in my back yard that is refusing to boot.  I get a link
light on my switch, so I know it's powering up but I can't ping it.
I've got to bring it down tomorrow and while I have it, I want to try
and rig up some sort of console over ethernet connection so I can always
get in to the console port if the ethernet doesn't come up.

I have a Cisco switch which came with a console adapter that has an
RJ-45 connector on one side and a DB9 on the other.  That's basically
what I'm looking for, but I'm not sure if the pins would need to be
crossed.  If they do need to be crossed I assume I could just do that at
either end with a null modem adapter.  I found this online at Radio
Shack and was wondering if using two of these would work:

http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=9
50-0285

Does anyone know what the distance limit for RS-232 communication is?

Thanks


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