I've wired a home with CatV 4 pair wire and the homeowner wants to network his PCs with this wiring. I'm using one pair for the home phone line with DSL. I believe I can get a triple jack for phone, cable & data.
My question is: Are the remaining three pairs enough and what are the connections.
Study Guides for VDV / Structured Cabling Installers
While they are enough, you must avoid it if at all possible. Where I work, they used two pairs for the data line, and one for the phone (from the same cable)... and now every time you pick up the phone you hear data signals. If you can prevent untwisting the wires more than 1/2" you will prevent most crosstalk, and also the problem I just described. As for the pairs: blue and white/blue are phone; orange and white/orange (one pair) with green and white/green (another pair) are data, send and receive, brown and white/brown are not used but should be terminated so they don't act as an EMI/RFI antenna. If you look at the jack, with the pins at the top, blue (phone) will be the middle pair, and the pins to the right and left of it will be another pair (they straddle the blue pair), with the other two pairs on the far ends. The far right pair is not used, and the far left & middle (split) pair are for data.
I have a phone line on a CAT5 with data and I haven't noticed the noise but I am deaf. (Too many years around line printers and check sorters) The problem I have heard of is ring current spiking the LAN and causing errors. I don't have any "bell" ringers so I doubt it is a problem. You probably wouldn't notice the errors in a residential setting anyway. If you were in an office where the LAN was banging hard all day and the phone never stops ringing it might be significant.
The only caveat is you will be limited to 100mz ethernet since the 1gb uses all 8 wires. Do you have the jack diagram? You will be splitting out the phone pair so you need to get the right pins for the pairs left.
Yeah, my thing is I tend to be "by the book" too much, and don't bend when I should. In a commercial, always-on, connection the crosstalk could be hellish, but in a residence you probably could get away with it.
If you are selling data you have to follow the book. I was only relating what I have got away with when the only one who can complain is me. In a residential setting, as long as the customer knows what the exposure is he can try it.