linux-kernel - Re: NIC as RS232

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Date:	Wed, 9 Jan 2008 13:39:24 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
cc:	Valdis.Kletnieks@...edu, Thanasis <thanasis@...r.hopto.org>,
	linux-kernel@...r.kernel.org
Subject: Re: NIC as RS232


On Jan 9 2008 09:29, Geert Uytterhoeven wrote:
>On Tue, 8 Jan 2008, Valdis.Kletnieks@...edu wrote:
>> On Tue, 08 Jan 2008 08:48:35 +0200, Thanasis said:
>> > Is there a kernel driver that would make a NIC's port work as a RS232
>> > port, using the serial cables that are RJ45 on one side and DB9 or DB25
>> > on the other? Maybe null modem cables of that type ? Or for example
>> > those used by cisco as console port cables?
>> > 
>> > (or may be I'm dreaming ;-)
>> 
>> What I *have* seen are connectors that go from DB9/25 to RJ11, not RJ45.
>> Basically, using the RJ11 to terminate a 4-conductor cable wired up for
>> serial use.  It's often hard to tell an 11 from a 45 unless you look at
>> it *real* close....
>
>We have plenty of DB9-to-RJ45 at work. Very useful when abusing the
>Ethernet cabling in the wall for serial connections (also used for
>phone).
>
>Maybe surprisingly to you, I haven't seen the RJ11 variant ;-)

UPSes like APC Back-UPS CS 500 use RJ11/45. Connector has 8 contacts,
but only 4 of them are fed to the to-USB integrated circuit. Funny.
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