Re: DB25 to RJ-45 Connectors
Chris Trown (ctrown@ecst.csuchico.edu)
Mon, 9 Dec 1996 20:32:16 -0800 (PST)
John G. Thompson sez
>
> On Mon, 9 Dec 1996, Derek Elder wrote:
> >
> > Could one of you fine people email me a contact for ordering DB25 to RJ45
> > connectors? I want to put one of them on a PM2 port and one on a modem
> > and connect them with a cat 5 cable.
> >
> > I'd really like for them to be premade :)
>
> Ah, I don't think you want to do that. Cat 5 is twisted pair and normal
> DB-25 cables are untwisted. Modem signals don't work well over twisted
> pair, I had one site that had that cat 5 stuff and was having TONS of
> problems, went to flat satin (read unwtwisted) and problems vanished.
>
> Just a warning, you may actually get it to work.
>
Actually, I had a huge number of problems getting all the modems on my
MP-16 bricks to work using flat, untwisted ribbon cable. Modems not answering
being the prime problem. Now and then, one would go to lunch.
When I re-arranged all the racks, I installed CAT-5 cable for the serial
lines and (I think) CAT-3 for the phone lines.
Before I did the re-wiring, I was telling people to stay away from the
MP-16's as if they were the plague. Now I say "Buy 'Em!"
Hmmm... How can you avoid crosstalk if all the wire in your bundles is
straight? Seems to me you need twist.
Chris...