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 From:  Lee Sharp <leesharp at hal dash pc dot org>
 To:  "m0n0wall at lists dot m0n0 dot ch" <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] console over modem?
 Date:  Mon, 18 May 2009 23:37:48 -0500
David Burgess wrote:
> If I understood you you're saying I should just construct a really
> long null modem cable using cat5. Interesting.
> My searches aren't turning up anything by Rob Whitney on the topic,
> but I'll keep looking. Anybody have any pointers on building a 15m
> serial cable, perhaps from cat5 or cat6? I guess I could use the
> charts here (http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm#rj45)
> to match the pinouts on the db9.

How about this?

Any adapter should work, as a DB9 has some unused pins in serial config. 
  I have no clue on the distance limitations, however.