How to Connect Faxes to DSL Lines

by Joshua Benjamin

Fax machines work much like old dial-up modems worked; they transmit data -- text and images, in this case -- through the phone lines to another fax machine somewhere else in the world. The second fax machine interprets the data coming in from the telephone line and then prints it out onto paper. Fax machine operation can be interrupted by DSL lines, however, because the DSL signal is also transmitted through phone wiring. This can result in a loss of data in the fax if steps are not taken to prevent it. Fortunately, this is not a difficult thing to fix.

Step 1

Unplug the fax machine from the phone jack.

Step 2

Plug your DSL filter into the phone jack. DSL filters are specifically designed to eliminate interference from the DSL line on your phone line.

Plug the fax machine into the phone line jack on the DSL filter. You can now use your fax machine and DSL line at the same time without risk of data loss or interference.


  • If you want to connect your fax machine to the same phone jack that your DSL modem uses, you will need to plug in a line-splitter first. Line splitters allow you to plug two phone lines into the same jack; just plug the DSL line into one jack and the DSL filter/fax machine into the second jack.

Items you will need

  • DSL filter

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