OT: Network Cable Tester
NoOp
glgxg at sbcglobal.net
Fri Sep 25 01:08:31 UTC 2009
On 09/24/2009 05:35 PM, Douglas Pollard wrote:
> 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
>>
>> --
>> ubuntu-users mailing list
>> ubuntu-users at lists.ubuntu.com <mailto:ubuntu-users at lists.ubuntu.com>
>> Modify settings or unsubscribe at:
>> https://lists.ubuntu.com/mailman/listinfo/ubuntu-users
>>
>>
>>
>>
>> --
>>
> 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
>
Not snipped on purpose...
Buy her a Fluke 620 instead :-)
More information about the ubuntu-users
mailing list