CAT5 Cable for Home Telephone Installations
As I write this, I'm getting ready to re-wire my 41 year old house with combo cable (sometimes referred to as "smart cable"; the version I plan to use is called Combo Cable). My grand plan is to pull this cable -- which comes in several versions, but I'm going to use one with 2 RG6Q coax cables and 2 CAT5e cables -- to each room in the house. My intent is make both RG6Q cables available for satellite (DirecTV), and then use one CAT5e cable for ethernet and the other for telephone.
With that in mind, I've searched far and wide on the internet to figure out what the 66-block wiring order should be for the 4-wire telephone installation using CAT5 cabling.
I did find it on a couple sites, but only one (Wolfgang S. Rupprecht's "Cat5 To Every Room of the House") had what I thought was a clear graphical representation. On the other hand, that site also has a typo in the color codes -- it shows all the wires in a CAT5 cable being striped, whereas in fact only half of them have stripes, the other half being solid colors. So I'm borrowing the format of Wolfgang Rupprecht's table here, but correcting the color codes on the CAT5 wires. The other difference with my version is that I've tried to make the color coding a bit easier to read than on his page -- just because I need it to be as clear as possible!
So if you've been wondering which CAT5 pairs to use when you hook up a telephone line, here you go... use it in good health.
| Pair | T/R | Telco | Ethernet |
|---|---|---|---|
| 1st Pair | Tip | Green | White/Blue |
| Ring | Red | Blue | |
| 2nd Pair | Tip | Black | White/Orange |
| Ring | Yellow | Orange | |
| 3rd Pair | Tip | White/Green | Ring | Green |
| 3rd Pair | Tip | White/Brown | |
| Ring | Brown |
By the way, and for what it's worth, I've also read on more than one site that mixing ethernet and phone on the same ethernet cable is not recommended. Ringing voltage on the phone line can, in some cases, interrupt the ethernet connection. And, perhaps more importantly, gigabit ethernet needs the spare pairs on the CAT5 cable, so don't put phone on the same cable if you ever want to move to gigabit!