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How do I wire a DSL splitter?
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Last Updated
2nd o October, 2009

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There are three two-terminal connections to a DSL splitter.
  • Network -- the outside telephone line with the DSL signal.
  • Voice -- to your telephone equipment.
  • Data -- to your DSL modem.

Since the splitter must "intercept" the phone line before it goes to any telephone equipment, the splitter usually has to be installed outside.

Disconnect the phone line with the DSL signal from your demarc box and route it, instead, to the "Network" terminals of the splitter. Make sure you are getting the phone line before it has split off to any other devices! These devices may make it easier to route the outside line through the splitter before connecting to the inside phones. BW-BW1or BW-BW3, depending on which demarcation box you have.
  • If the wires are green and red, green is "tip" and red is "ring".
  • If the wires are black and yellow, black is "tip" and yellow (or white) is "ring".
  • If one or both of the wires are multi-colored, the wire with more white is "tip", and the wire with less or no white at all is "ring".
From the splitter, the "data" side needs to go straight to your DSL modem.

Jumper from the voice side of the filter back to the terminals that the outside line used to connect to.

Note that, if you have a security system, it must be connect somewhere between the "Voice" output of the filter and before the telephone equipment inside.

More info on DSL wiring.
More info on RJ31X jack wiring.

Visitor Comments
  1. Comment #1 (Posted by nancy mariel )
    WOW---I am "training" (I am a woman) with a cable co and YOU ALL have given me more info than they have in 2 weeks' "training." It is some guy voodoo thing to them---bunch of idiots! THANK YOU for the insights!!!
  2. Comment #2 (Posted by Florence Kozda )
    I have been trying to get this information from my husband for years now. My father would like to be able to use his landline while being on the internet. Either my husband is dense "because we are able to do that with our computer" or I am speaking in an other language! It's nice to have a place that will answer my questions Thanks, Florence Kozda
  3. Comment #3 (Posted by Major West )
    Most of what I've read, including in your tutorials, recommend upgrading to cat 5 (or higher) cable if running a dedicated DSL line. My question is: how can I use a cat 5 cable (wider plug) if the jack on the back of my DSL modem only accepts the standard modular telephone plug? [ HomeTech responds: Point 1: Cat5 cable is NOT necessary from the phone company up to your DSL modem, although it sure doesn't hurt. It IS necessary for the network cable from the DSL modem to your computer(s). Point 2: You can use a modular plug on the end of a cat5 cable...you just don't connect the 4th pair. See the "USOC" standard here: http://www.hometech.com/learn/wiringst.html ]
  4. Comment #4 (Posted by Lonagcio )
    great knowledge. thanks
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