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Can I pull CAT6 cable via old RJ11 panels?

Home Improvement Asked on October 5, 2021

I have spotted multiple RJ11 ports in the home I am moving into soon. They are spread across the first and second floors of the house. Is it possible to use that existing wiring to pull through CAT6 cable to use for an RJ45 port and a patch panel where the phone line originally terminated? If so, are there any dangers? Is there something I should be actively looking for? This is an older home (early 1900’s).

One Answer

There are two problems you are likely to run into.

  1. Pulling new wiring with existing is hit and miss, sometimes you can do it but sometimes wires are clipped/stapled in places you can't access, sometimes the cable routes have too many turns or obstructions to pull and sometimes the wires are just directly buried in plaster.

  2. Old phone wiring was often daisy chained whereas Ethernet wiring needs an individual run from each point to the network switch.

The bottom line is you may be able to reduce the damage to decor by pulling wiring in some places using the existing wiring but it is very likely you will end up having to do some damage in the process of getting the new wiring in.

Pulling through the wall between an outlet and a space under the floor or above the ceiling may or may not be possible, pulling through a run between multiple rooms without any intermediate pull points is highly unlikely to be possible.

Correct answer by Peter Green on October 5, 2021

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