I wonder if I can replace the phone cable that connects my DSL router to the box outside the building with a Cat5/6 cable.

The phone cable in use has only two wires inside it. So, I was wondering if I can use two wires from the Cat5/6 cable for carrying out the signal from the box to the router. I heard using Cat5e and Cat6 cables is more beneficial than the ordinary phone cable because Cat5e/6 cables handle interference better.

Also, are there any benefits to using Cat6 over Cat5 in this case? If what I said is possible, which two wires inside the Cat cables should I use? From my understanding I will use two of the wires on the Cat cable and connect them directly to the box outside after stripping them. Then, on the other side I will put an RJ11 connector and put those two wires that I used on the box to the middle pins of the connector.

Is that right? Also, will I need to cut any of the other six wires off? Which other wires should be inside?

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    Yeah you can do that if you want. Just use the blue, blue/white pair. We did it all the time when I worked at a phone company for a while. – DrZoo Mar 7 '16 at 17:16
  • Thanks. What do I do with the rest of the wires, though? – JackBrooks Mar 7 '16 at 21:29
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    You should note that in some territories the cable from the termination box to the outside world is actually the property of your phone provider, interfering with it may invalidate your contract. – Burgi Mar 8 '16 at 14:03
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    Changing the category of cabling on POTS is rather pointless since POTS is designed to use Category-3 cabling. It is doubtful that you have the expertise or proper equipment to terminate and test for Category-5E or Category-6 compliance since a category rating is much more than just the rating of cable itself. You will just be wasting money. You will be connecting a higher category cabling to a lower category cabling system, and the resulting category rating of the whole will be the lowest category rating of any component in the system. In your case, Category-3. – Ron Maupin Mar 8 '16 at 16:51

Blue and Blue white are center pair too. If you punch everything down into an RJ 45 jack (ehternet jack) then an RJ 11 (phone jack 2 pair) can plug into an RJ 45 jack and use center 2 pair. Lines up perfectly. Then the line can be used for RJ 45 or RJ 11 purposes. Good Luck!

  • I am sorry I did not get what you are trying to say. I got the blue wires part. Thanks. What do I do with the rest of the wires what should I cut and should I put inside the RJ11 jack (other than the blue wires). – JackBrooks Mar 7 '16 at 21:31
  • Nothing just the blue wires... – Jim O'Brien Mar 7 '16 at 21:33
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    What do I do with the rest of the wires? Leave them outside the jack? Cut them? – JackBrooks Mar 8 '16 at 10:55
  • Either will do. – Jim O'Brien Mar 8 '16 at 14:56

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