OT: Network Cable Tester
Douglas Pollard
dougpol1 at verizon.net
Fri Sep 25 00:35:36 UTC 2009
Roger Neth Jr wrote:
> The Fluke 620 is probably the easiest tester to use. You have to wire
> correctly by wiring standards. Then you can use the tester to test
> your wire connection. The tester will give you the wire map e.g.
> 12364578 or cross over 36124578. An open could look like this
> 123o45o8. The Fluke 620 also gives you a nice audible sound if a cable
> passes or not. The Fluke 620 has always worked for me on cat 5 and 5e.
>
> I also had a more expensive Fluke LinkRunner, but never used it as the
> Fluke 620 did the job much simpler.
>
> Roger
>
> On Thu, Sep 24, 2009 at 3:23 PM, drew einhorn <drew.einhorn at gmail.com
> <mailto:drew.einhorn at gmail.com>> wrote:
>
> On Thu, Sep 24, 2009 at 3:44 PM, David Curtis
> <dcurtis at uniserve.com <mailto:dcurtis at uniserve.com>> wrote:
> > On Thu, 24 Sep 2009 15:04:23 -0600
> > drew einhorn <drew.einhorn at gmail.com
> <mailto:drew.einhorn at gmail.com>> wrote:
> >
> >> On Thu, Sep 24, 2009 at 1:37 PM, Roger Neth Jr
> <baypos at gmail.com <mailto:baypos at gmail.com>>
> >> wrote:
> >> > I have used a Fluke 620 for 8 years and works great for what your
> >> > needs are, look on ebay also.
> >>
> >> Definitely can't afford a new one.
> >> Might be able to afford a used one on ebay.
> >>
>
> Hmm. The more I look at it, the more I think it's worth it.
>
> >> Looking at the specs. How do they do that? I can see some of it.
> >> But, without something connected at the far end, how do they tell
> >> there isn't an open circuit at the connector on the far end of the
> >> cable?
> >
> > http://en.wikipedia.org/wiki/Time_domain_reflectometry
> >
> > and
> >
> > http://en.wikipedia.org/wiki/Time-domain_reflectometer
> >
> > Not exactly sure what improvements have been made over the
> years, but
> > in the late '90s we would send PCBs to get 'TDR' tested to
> measure the
> > impedance of certain copper traces that carried either high
> frequency
> > signals or were part of differential circuits. Same principles
> apply.
> >
>
> That's what I was thinking in general, but had no idea the
> resolution was good
> enough to see that the connector is wired correctly. Especially,
> without needing
> to plug in some kind of terminator. I thought it was just good enough
> to see how
> far down the cable the faults are.
>
> It almost sounds like it has too be able to detect the color of the
> insulation, and
> sense pin numbers for some of its tests.
>
> There's definitely more here than I understand.
>
> I need to go download a manual and get a better idea idea about
> exactly
> what it can and cannot do.
>
> --
> Drew Einhorn
>
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>
>
> --
>
My wife has a Dell mini 9 4g hd drive. Because she downloaded all
updates it completely filled the drive. So we did a reinstall from the
Dell CD and there was less than 600 Mb space left. So you can get it a
little better than 400mb but not a lot. We may install puppy Linux I
think we will have 1.5 G or a little better space left. We'll see.
Doug
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