OT: Network Cable Tester

[Douglas Pollard]

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