(question) Ethernet cable wiring

[Jarl Stefansson]

Actually the colours do matter a bit, the different pairs have slightly
different numbers of twists for a given length and crosstalk will behave
differently though of course the most important part is to ensure the
paired wires are used as pairs.

R.

Jarl


On Sat, May 18, 2013 at 7:25 PM, James Knott <james.knott-bJEeYj9oJeDQT0dZR+AlfA at public.gmane.org> wrote:

> William Park wrote:
>
>> Hi,
>>
>> I had it with wireless speed, so I'm thinking about running wires around
>> outside of my house.  I have question...
>>
>>      - For crossover cable, some say just cross two pairs (Green/Orange),
>>        but others say cross all four pairs (Green/Orange and Blue/Brown).
>>        Which is right?
>>
>
> Only the green & orange.  The others are not used at 10 or 100 Mb.  At
> Gigabit, all 4 pairs are used, but there's no crossover needed at that
> speed.  Also, newer switches etc. can autoconfig for crossover.  BTW, why
> do you need to crossover?  Normal wiring is straight through and you'd only
> use a crossover to connect 2 computers directly or two switches that don't
> support autodetect.
>
>
>
>>      - Should I use T568A or T568B?  Some say T568B, but others (citing
>>        US Gov) say T568A.  Well, crossover cable is essentially going
>>        from T568A to T568B, but only for Green/Orange.  As long as the
>>        two ends are the same, should it matter?
>>
>
> The actual colours don't matter, so long as you're consistent and don't
> mix pairs.  So you could make up your own colour code if you wished.
>  However, I generally prefer T568A, which keeps the blue and green apart,
> making it easier to spot wiring errors.
>
>
>>      - Any recommendation for store that sells decent (in quality/price)
>>        ethernet cable and crimping tools and parts?  Default is Home
>>        Depot.
>>
>
> I generally go to Sayal.
>
>
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-- 
Regards,

Jarl Stefansson
jarl.stefansson-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org
+1-416-888-6908
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