Eu fiz sozinho na minha casa com o Cat 5e e está funcionando bem por mais de dois anos. Ele realmente funciona porque as freqüências de telefonia não têm energia de sinal suficiente para afetar as freqüências de ethernet de um par para outro dentro do cabo causando Crosstalk (e vice-versa, a ethernet não afetará sua telefonia). Apenas preste atenção ao fato de que ele funcionará apenas com 10/100 (velocidade FastEthernet), uma rede Gigabit usará todos os seus 4 pares de fios.
Aqui é uma referência rápida :
This is made possible because of the wasteful (some may say "spare") wires in cat-5 cable.
Cat 5 cable and RJ-45 jacks have eight wires. Ethernet uses two pairs (four wires), one for send and one for receive. Telephones use two wires.
Therefore, you can run both ethernet and telephone over the same wire, and still have two wires left over.
In fact, you could run two Ethernet jacks from a single cat-5 cable, or four telephone lines (though I don't know why you would run multiple phone lines.)
This Instructable will focus on changing wall plates from one RJ-45 (Ethernet) jack into one RJ-45 and one RJ-11 (phone) jack.
Note that I have not done extensive testing with cross-talk between phone and ethernet, though I have seen no degradation in the quality of either when both are in use.
Also note that this procedure will not work with PoE (Power over Ethernet) devices. Nothing bad will happen, it just won't transmit power. See step 13 for a possibly unsafe way to keep your PoE and add phone service. Also, it will not work with gigabit ethernet-- gigabit ethernet uses all four pairs. It will work fine at 10/100 Mbps which is sufficient for most people.
