Subj : Re: Alternative solution - was [Re: Manually setting a STATIC IP inWin
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Date : Fri Jan 18 2019 01:09 pm

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From: "R.Wieser" <[email protected]>
Newsgroups: microsoft.public.windowsxp.help_and_support
References:
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Subject: Re: Alternative solution - was [Re: Manually setting a STATIC IP
inWinXPPro]
Date: Wed, 18 Jan 2017 20:09:10 +0100
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microsoft.public.windowsxp.help_and_support:31893

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 <[email protected]> schreef in berichtnieuws
[email protected]...
> 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 <[email protected]> schreef in berichtnieuws
> > [email protected]...
> >> 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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