Re: [WinMac] Cable Scanner?

Romeyn Prescott(prescor[at]potsdam.edu)
Mon, 31 Jan 2000 08:57:12 -0500

I passed this on to our Network techs. They said they have
investigated these models, but unfortunately they require that all
devices on a segment either be off or disconnected from the segment
in order to work. THe scanner we currently have does NOT. :-(

...ROMeyn

PS: I REALLY appreciate all this input!

At 2:50 PM -0500 1/30/00, John C. Welch wrote:
>What you want is a cable scanner with a coax adapter, and a Time Domain
>Reflectometer function, (TDR). The TDR is what will tell you where a break
>is. Actually, it gives you the electrical length of the cable. If that is
>too short, you have an open, if it's too long, you have a short, or a cross
>connect. The better ones will show you connection points. Both Fluke, and
>Pentascanner can give you this ability.
>
>john
>
>who learned TDR usage on B-1B's, where physical access is not often
>possible...
>
> > From: Romeyn Prescott <prescor@potsdam.edu>
> > Reply-To: winmac@lists.best.com
> > Date: Sat, 29 Jan 2000 20:48:15 -0500
> > To: winmac@lists.best.com
> > Subject: Re: [WinMac] Cable Scanner?
> >
> > I should have mentioned that this scanner also pinpointed a fault
> > (short or open) to within a foot from the scan point. No ohm meter's
> > gonna do THAT!
> >
> > To those of you suggesting that we replace our entire campus
> > infrastructure with 10BaseT, well, I echo the sentiment.
> > Unfortunately, 10 years ago when the decision to wire our campus was
> > made, Thin looked to be the way things were going. Or that's the way
> > they were at the time. No matter what drove the decision, obviously
> > no one was thinking scalability! So now we're stuck with it. We
> > have a 155Mb ATM backbone, but with a few exceptions, most of the
> > rest of our network is 10Base2 or 10BaseT. The fiber links from our
> > DecSwitches are 10Mb also, to DEMPR Thin repeaters with daisy loop to
> > all offices from wiring closets. A dog. Yes. But when you consider
> > that 95% of our user base uses the technology for chacking E-mail
> > (who needs to do THAT at 100Mb speed?) and Web surfing (with a huge
> > bottleneck at the SUNYNet gateway in Syracuse and/or Buffalo) and not
> > much in the way of local file transfer, it's not THAT bad.
> >
> > Yes, we're pretty entrenched in Thin Ethernet, and unless the
> > governor sees fit to channel some lottery money into the SUNY system,
> > it won't be changing any time soon!
> >
> > ...ROMeyn
> >
> >> Oops! I meant to write more than 22 ohms and less than about
> >> 32 ohms. This
> >> corresponds to 50 ohms/2 minus 10% (which is the two 50 ohm terminator
> >> resistors in parallel - 10% tolerance).
> >>
> >> At 08:30 PM 1/28/00 -0500, I wrote:
> >>>
> >>> Analog VOM (Volt-Ohmmeter). Look for more than 35 ohms, and less than
> >>> about 50 ohms.
> >>
> >>
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> >
> >
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>
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This archive was generated by hypermail 2.0b2 on Mon Jan 31 2000 - 06:20:10 PST