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Re: Throughput riddle

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On 03/18/2016 06:47 PM, Richard Hector wrote:
> On 19/03/16 14:01, David Christensen wrote:
>> I use category 5E cables for Gigabit.  Category 5 and category 6
>> cables were not reliable for me.
>
> Cat 5 cables _should_ work, in theory, though I gather some don't work
> so well. If you have any cat5 or better cables that are unreliable,
> I'd suspect the individual cable, not the stated spec. They may just
> be badly made.

Along with the tester, I also bought a 1,000 foot spool of category 5E 
riser cable, a crimping tool, and crimp connectors.  Now I make my own 
cables and test them.  :-)


>> Perhaps the NAS has an automatic crossover feature on it's Gigabit
>> port. If you do a computer-cable-computer test, you will want a
>> (category 5E) crossover cable.
>
> There's no need for crossover cables for gigabit. Gigabit communicates
> both ways over all 4 pairs anyway, and autonegotiating is part of the
> spec.

Thanks for the tip!  :-)

     https://en.wikipedia.org/wiki/Ethernet_crossover_cable


>> Make sure you are using the right cables and that they are known
>> good. I own an Ideal LinkMaster cable tester, and it has been worth
>> every penny:
>>
>> http://www.amazon.com/Linkmaster-UTP-stp-Cable-Tester/dp/B000LDC3LA
>
> A tester like that will tell you if there's continuity in the right
> places - a cat 3 cable will test fine, and you could make a cable with
> phone cable, power cable or whatever you like and get it to test fine.
> Testing to Cat5 or whatever takes a _much_ more expensive tester, to
> check impedance and capacitance (and variations of those down the
> cable) and suchlike. It's a good start, but probably won't help much
> for "it's a bit slow".

I've spoken to sound/ communications technicians who talked about 
validating Ethernet cabling to X MHz and I've glanced at the expensive 
Fluke networking meters that I assume can do such measurements. 
Fortunately, a simple continuity tester and whatever utilities the OS 
provides have been enough to get me by.


David

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Thread

Throughput riddle Celejar <celejar@gmail.com> - 2016-03-18 17:50 +0100
  Re: Throughput riddle "John L. Ries" <jries@salford-systems.com> - 2016-03-18 19:50 +0100
    Re: Throughput riddle "John L. Ries" <jries@salford-systems.com> - 2016-03-18 20:30 +0100
      Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-18 20:40 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-18 20:40 +0100
  Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-19 02:10 +0100
    Re: Throughput riddle Richard Hector <richard@walnut.gen.nz> - 2016-03-19 02:50 +0100
      Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-19 03:10 +0100
        Re: Throughput riddle Richard Hector <richard@walnut.gen.nz> - 2016-03-19 03:50 +0100
          Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-19 04:50 +0100
          Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 14:20 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 14:20 +0100
      Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-20 17:40 +0100
        Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 19:10 +0100
          Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-20 21:50 +0100
            Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-21 03:20 +0100
              Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-21 06:00 +0100
                Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-22 05:30 +0100
                Re: Throughput riddle David Christensen <dpchrist@holgerdanske.com> - 2016-03-24 02:50 +0100
                Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-24 04:10 +0100
  Re: Throughput riddle arian <debian@semioptimal.net> - 2016-03-20 14:50 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 15:50 +0100
      Re: Throughput riddle arian <debian@semioptimal.net> - 2016-03-20 16:30 +0100
        Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-20 18:40 +0100
        Re: Throughput riddle Andrew McGlashan <andrew.mcglashan@affinityvision.com.au> - 2016-03-20 19:50 +0100
  RE: Throughput riddle Bonno Bloksma <b.bloksma@tio.nl> - 2016-03-21 12:50 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-22 05:40 +0100
  Re: Throughput riddle Dan Purgert <dan@djph.net> - 2016-03-21 13:30 +0100
    Re: Throughput riddle Celejar <celejar@gmail.com> - 2016-03-22 05:50 +0100
      Re: Throughput riddle David <david.g_jones@ntlworld.com> - 2016-03-22 11:20 +0100
        RE: Throughput riddle Bonno Bloksma <b.bloksma@tio.nl> - 2016-03-22 13:40 +0100

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