How to convert rj11 to rj45: cat 6

Written by bonnie conrad
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How to convert rj11 to rj45: cat 6
Your landline phone uses a RJ11 connection. ( Images)

Many computer owners confuse the similarities of the appearance of the RJ11 and RJ45 CAT6 connection. The shape of both connections looks exactly the same, leading to easy mistakes in what cord to use. Since these two types of connections perform different functions, If you need to connect your computer to the network but your existing connection is an RJ11, you can convert that connection to an RJ45 CAT6 with a simple adaptor.

Skill level:
Moderately Easy


  1. 1

    Examine the wall plate for the RJ11 or RJ45 CAT6 connection. When buildings are wired, the contractors typically label each wall jack. If you see a V next to the jack number, that is an indication that the port is a voice jack and it uses a RJ11 connection. If you see a D next to the jack number that indicates a data port, and a RJ45 CAT6 connection.

  2. 2

    Check the size of the connection on the wall plate. The connector shape is the same for both RJ11 and RJ45 CAT6 cables, but the opening for a CAT6 RJ45 connection is slightly larger.

  3. 3

    Insert a phone cord into the connection if you cannot tell which it is. If the phone line seats properly, you have a RJ11 connection. If the cord is loose and pulls right back out, you have a RJ45 CAT6 connection. If your existing wall plate is a RJ11, you need to use a RJ11 to RJ45 adaptor before you can plug in your CAT6 network cable.

  4. 4

    Insert the male end of the RJ11 to RJ45 adaptor into your existing wall plate. You should hear a click as the adaptor snaps into place. Pull on the adaptor to be sure it is securely connected.

  5. 5

    Plug your CAT6 network cable into the RJ45 connection on the RJ11 to RJ45 adaptor. Push the cable until it snaps into place, then tug gently on to ensure it is fully seated.

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