Re: Ethernet NIC renegotiation problem.
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On 02/18/2015 08:06 PM, Richard Hector wrote:
> On 19/02/15 15:32, Dan Purgert wrote:
>> Point of contention -- if the BUCH is only using cat5 in his
>> install, the fact he's getting gbit for any time at all is a
>> miracle. Min requirement for gig over copper is 5e (with cat6
>> being preferred).
>
> My understanding is that Cat5 is and has always been the minimum
> requirement for 1000base-T. At a quick glance, Wikipedia appears
> to agree, though it suggests 5e or 6 is preferred.
>
> On slightly deeper reading, it seems that while all of these specs
> have the same target characteristics, the tolerances reduce as the
> spec goes higher, so more reliable performance is likely. I now
> see more point in the higher specs than I did half an hour ago :-)
>
> I agree with the requirement to do the cabling, and especially
> terminations, properly.
>
> Richard
>
>
>
I believe the wikipedia article actually stated at 100base cat 5 and
cat5e is okay but the gigabit is to use cat 5e.
Quote from article:
To support Gigabit Ethernet, a higher performance version of cat 5,
enhanced cat 5 or cat 5e has been added to the standards. Cat 5e adds
new performance requirements to permit higher speed network operation
In real life depending on the length your throughput for 5 will be far
less than 5e.
- --
Joseph Loo
jloo@acm.org
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