How to Make RJ11 to RJ45 Connectors for a DSL Modem

By Katherine Johnson

Standard registered jacks, known as RJ-type jacks, are found in nearly every communication and data system. Standard RJ-11 connections have four wires, but only two wires are used for basic telephone wiring. RJ-45 connections are primarily used for network and telephone cabling, but the connections are occasionally used for serial connections. RJ-45 connectors are similar to RJ-11 connections, but they are slightly wider. Making a cable for your DSL modem using both RJ-45 and RJ-11 connections allows you to save money and use as little or as much CAT5 cable as you need for your project.

Things You'll Need

  • RJ-45 plug
  • RJ-11 plug
  • CAT 5 cable
  • RJ-11/RJ-45 wire stripper and crimper

Step 1

Cut the length of CAT5 cable that you need for your DSL modem, and strip two inches of the wire casing from each end of the CAT5 cable. Do not cut the wires inside the cable.

Step 2

Pick up one end of the CAT5 cable. This end will use the RJ-45 connector. Flatten out the wires so they will fit into the connector, and cut the wires evenly, abouot one inch from the end of the wire casing.

Step 3

Insert the wires into the RJ-45 connector with the locking tab facing down. The wires should reach all the way to the end of the clip. Arrange the wires in the following order, from left to right: White/Orange, Orange, White/Green, Blue, White/Blue, Green, White/Brown, BrownCrimp the end with the wires still in the clip.

Step 4

Pick up the other end of the CAT5 cable. This end will use the RJ-11 connector. Flatten out all of the wires so they will fit into the connector. Cut the wires evenly, about a half of an inch from the end of the wire casing.

Step 5

Insert the wires into the RJ-11 connector with the locking tab facing down. The wires should reach all the way to the end of the clip. Only the four middle pins are used, which will leave the two outside pins empty. Arrange the wires in the following order, from left to right: White/Orange, Blue/White, White/Blue, Orange/White.Crimp the end with the wires still in the clip.