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From: "R.Wieser"
Newsgroups: microsoft.public.windowsxp.help_and_support
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<587fbc47$0$21546$e4fe514c@news.xs4all.nl>
Subject: Re: Alternative solution - was [Re: Manually setting a STATIC IP
inWinXPPro]
Date: Thu, 19 Jan 2017 08:52:00 +0100
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microsoft.public.windowsxp.help_and_support:31894
Addendum,
I just re-read my post and see I didn't make my self too clear (excuse of
the day: It was late when I wrote it), I should have quoted an additional
line:
> *NO*
> A "cross over" cable connects two Ethernet ports.
....
> A "null-modem" connects two DTE or two DCE together.
Those cables have the _exact same_ function, one for serial, the other for
ethernet.
And if I may point something else out, the phrase "connects two Ethernet
ports" is non-informative. Like if you would have used "two serial ports"
in the second.
Also consider that for ethernet all 'puters are comparable to DTEs from the
serial-port case, with the modems, hubs and switches taking the place of
DCEs. Maybe that makes it easier to see how both cables are effectivily the
same.
Regards,
Rudy Wieser
-- Origional message:
R.Wieser schreef in berichtnieuws
587fbc47$0$21546$e4fe514c@news.xs4all.nl...
> Richard,
>
> > *NO*
> ...
> > A "null-modem" connects two DTE or two DCE together.
>
> As you feel that strong about it I googled to have some backup for what I
> assumed to be true, and came across this page:
>
> http://digital.ni.com/public.nsf/allkb/1EE0DD8AF67922FA86256F720071DECF
>
> It shows that the so-called "null-modem" cable is to connect a two devices
> of the _same type_ together (in other words: crossing the TXD and RXD
> wires), and the "straight thru" to connect a DCE to a DTE.
>
> To be honest, I have allways though of a "null modem" cable as being the
one
> with just TXD and RXD (and ground ofcourse) connected to the other machine
> (regardless of if it was of the same, or opposite type), with the control
> lines connected back to their counterparts on the same connector.
>
> So, it looks like we both made a mistake. :-)
>
> > P.S. I've been using null modems for >50 years ;}
>
> I have been using them, and others of its kind for quite a while too, and
> have even been known to solder a few myself. Regardless our time that we
> used them, we both seem to have misremembered.
>
> Also, age has little meaning on the "interwebz". Knowledge is the only
> thing that counts here. :-)
>
> Regards,
> Rudy Wieser
>
> P.s.
> More of the same:
>
https://www.decisivetactics.com/support/view?article=crossover-or-null-modem
> -vs-straight-through-serial-cable
>
> http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm
>
> http://www.columbia.edu/kermit/cable.html
>
> All show a "null modem" cable to connect two devices of the same type.
>
> I'm not sure how you ...
> Scratch that. I notice all your links are to the same source.
>
>
> -- Origional message:
> Richard Owlett schreef in berichtnieuws
> GNqdncrpM4GpA-LFnZ2dnUU7-WXNnZ2d@supernews.com...
> > On 1/18/2017 9:23 AM, R.Wieser wrote:
> > > Richard,
> > >
> > >> The minimal network was being pursued as it was a close as
> > >> I *HAD THOUGHT* I could come to a "null modem cable".
> > >
> > > Thats the "cross over" cable I mentioned* :-)
> > >
> > > *although a null-modem cable normally includes cross-over, it does
need
> to.
> >
> > *NO*
> > A "cross over" cable connects two Ethernet ports.
> > https://en.wikipedia.org/wiki/Medium-dependent_interface#Auto_MDI-X
> >
> > A "null-modem" connects two DTE or two DCE together.
> > https://en.wikipedia.org/wiki/Data_circuit-terminating_equipment
> > https://en.wikipedia.org/wiki/Data_terminal_equipment
> > https://en.wikipedia.org/wiki/Null_modem
> >
> > IOW connect COM ports of two computers to each other.
> >
> > P.S. I've been using null modems for >50 years ;}
> > Ethernet is only ~30 years old.
> > https://en.wikipedia.org/wiki/Ethernet
> >
> >
> >
> > >
> > > But its still a good idea to first connect to a known-to-be-good
device
> (the
> > > modem or smart switch (or anything else with a web-accessible setup) I
> > > mentioned) so that you can see your fixed IP actually works (on both
> > > 'puters), _before_ you try that cross-over cable (I'm not sure you
> realize,
> > > but now you've introduced a _third_ location that could give you
> troubles
> > > with setting up such a 'puter-to-'puter connection).
> > >
> > > Regards,
> > > Rudy Wieser
> > >
> > >
> > > -- Origional question.
> > > Richard Owlett schreef in berichtnieuws
> > > LZydneiMicXqHOLFnZ2dnUU7-XnNnZ2d@supernews.com...
> > >> On 1/16/2017 7:47 AM, Richard Owlett wrote:
> > >>> I have two Lenovo laptops. One running WinXP Pro. The other runs
> > >>> Linux.
> > >>> I wish to create a minimal network. It will consist of only those
> > >>> two machines.
> > >>> Neither will have any internet connectivity.
> > >>>
> > >>> I've found a number of web references to setting static IP
> > >>> addresses on Windows machines.
> > >>> *HOWEVER* assume internet connectivity by one/both machines.
> > >>>
> > >>> Can anyone point me to any documentation EXPLICITLY covering my
> > >>> {admittedly} peculiar requirement.
> > >>>
> > >>> TIA
> > >>
> > >> The minimal network was being pursued as it was a close as I *HAD
> > >> THOUGHT* I could come to a "null modem cable".
> > >> A USB implementation is available -
> > >> http://www.mouser.com/ds/2/163/DS_USBNMC-5030.pdf .
> > >> I'll check local suppliers.
> > >> Will also continue pursuing the LAN solution for its educational
> > >> value.
> > >
> > >
> > >
>
>
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