[SI-LIST] Re: Why ethernet RJ45 8P8C are wired in today's way?
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 02 Sep 2012 14:38:26 -0700
It was done back in the days of 10BT when the signal integrity impact
was nil. The idea was to distinguish from telephone wiring which
assigns the pairs in order.
On 9/2/2012 1:30 PM, Flash Neo wrote:
> Hi fellow si-listers,
> I have been doing ethernet transceiver design for a while. (Not long
> though.) Longly, I have a unsolved question about the way RJ45 connector
> pins are assigned.
>
> As shown in this wiki link, http://en.wikipedia.org/wiki/TIA/EIA-568#Wiring,
> signal pair 2 is not placed next to each other, instead, pair 1 seperated
> pair 2's plus/minus pairs.
>
> What is the motivation to do it this way? I don't see any benefit.
>
> Thanks,
> Neo
>
>
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