[Asterisk-Users] New $89 VOIP phone

[robert.johnson-perkins at uk.nomura.com]

> From: Chris Shaw
> > From: "Andrew Kohlsmith" <akohlsmith-asterisk at benshaw.com>

> > 2 ethernet connections by using all 4 pairs of the cable. 
> > Put one at your desk, and one at your switch, et voila; 2 independent ethernet connections
> > over one cable.
> >
> > You could also do this without those splitters by splitting 
> 2 pairs of wires to 2 connectors on both side of the cable.
> 
> You're kidding right?
> 
> There's a reason why category 5 cable is twisted the way it is... to
> eliminate or greatly reduce RF crosstalk on the wires... Now 
> what would
> happen if you split those wires between 2 different signals 
> and kept them
> tightly packed together?
> 
> Can we say random data corruption, mysterious errors and terrible
> performance? Bingo!
> 
> Again, this kind of thing might be ok for a small home 
> network, but you
> can't seriously suggest it for a business...

As long as you wire them up correctly, will not be a problem:

I wire them as
	RJ45 socket 1: pins 1&2 (TX+/-) to orange pair, pins 3&6 (RX+/-) green pair
	RJ45 socket 2: pins 1&2 (TX+/-) to brown pair, pins 3&6 (RX+/-) blue pair

The fact that the signals run down a twisted pair REDUCES cross talk, which is why the cables CAN be unshielded.
Think about it, the only thing separating two cables is the grey plastic! and they don't crosstalk.

Seems, kind-of, environmentally unfriendly leaving all of those pairs left unused.....

Anyway, belkin et all sell the cable economizers so it must be fine ;-)


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