How to Use a Splitter on Phone Lines

Written by anthony hare
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A phone line splitter, also referred to as a DSL filter, is a device used to allow a telephone device and an ADSL modem to share the same phone line. It separates the signals being sent down the phone line into two parts: voice and ADSL signals. It is a box that connects to your wall socket where your phone usually is. On this box are two ports, one for your phone line and one for your modem. It is an essential component for setting up an ADSL connection.

Skill level:


  1. 1

    Disconnect your telephone device from the wall socket.

  2. 2

    Plug the wire on your splitter (often labelled "Line") into the phone socket.

  3. 3

    Plug the cable from your telephone device into the port on the splitter labelled "Phone" and the cable from your ADSL modem into the port labelled "ADSL."

Tips and warnings

  • You will need to fit phone line splitters to all additional phones in your house.
  • Fit a line filter between your telephone and the splitter for a clearer phone signal.
  • Do not fit a line filter to the ADSL line, as this will give you an unreliable connection.

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