IP Telephony and Copper Pairs

Unanswered Question
Dec 15th, 2008

I have a contractor that wants to split the pairs (2 pairs each) of a single Cat6 cable so that he can connect two analog phones. While this is fine for analog phones, I'm not sure that this will work so well when we move from analog phone services to VoIP.

Can VoIP run properly over 2 pairs of wire? I've been told that this will work at the 10 and 100 Mbps level, but not at gig speeds?

I have this problem too.
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hadbou Fri, 12/19/2008 - 07:21

I think it will work but it's not recommended. You should really run another cable.

Ronald Spencer Wed, 12/24/2008 - 13:23

I agree with others, but will play devil's advocate for a moment.

In terms of pinout, ethernet rides on 1, 2, 3 and 6. 4, 5, 7 and 8 are unused. It just so happens that PoE also rides on 1, 2, 3 and 6. so, from an "ability" standpoint, you could do it. The question that remains is: Should you do it?


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