[SI-LIST] Re: Why ethernet RJ45 8P8C are wired in today's way?
- From: Rick Collins <gnuarm.2006@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 02 Sep 2012 18:17:07 -0400
The residential connector is an RJ-11, but the RJ-45 is used for
commercial PBX connections IIRC.
Still, I don't see how the different wiring would "distinguish" the
connectors in any way. They will look exactly the same from the
outside. Does this wiring somehow prevent damage? I seem to recall
hearing of people plugging RJ-11 phone lines into their RJ-45 network
ports (yes, the connectors will allow that) and causing damage to
their computers from the 48 VDC.
Rick
At 05:46 PM 9/2/2012, Flash Neo wrote:
>Thank you for this info.
>why people want to avoid this confusion? aren't they using different
>connector anyway?
>On Sep 2, 2012 2:39 PM, "steve weir" <weirsi@xxxxxxxxxx> wrote:
>
> > 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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