Dear Mr. Electrician. What is the telephone jack wiring color code for my house? I want to replace all of the old telephone jacks, but am confused by the tip and ring color code. The new telephone jacks have red, green, yellow, and black terminals, but the telephone wiring in my walls have eight wires with different color stripes. How do I connect the new telephone jacks?
Answer: I have put together a residential telephone jack wiring color code chart to help you understand how to connect the existing four pair telephone wiring in your walls to the new telephone jacks. NOTE: Some text links below go to applicable products on EBay or Amazon.
The four pair wire is capable of having four separate telephone lines at each jack location. However if you only have one telephone line for your house, you should use the same color pair for each new phone jack that you install.
TELEPHONE JACK WIRING COLOR CODE FOR HOME
“Tip” refers to that side of a two wire telephone circuit which is connected to the positive side of a battery at the telephone company’s central office. “Ring” refers to that side of a two wire telephone circuit which is connected to the negative side of a battery at the telephone company central office.
Generally speaking the phone company connects the phone lines at their termination block in a certain order. The blue pair is first, the orange pair is second, the green pair is third, and the brown pair is fourth. So for one phone line, the blue pair should be the correct line to connect to.
However there may be instances where the phone company found a problem with the blue pair and had to use the orange pair instead. It is possible that there was a problem with all of the pairs going into you house and the phone company had to split between pairs of wires.
When removing the old telephone jacks, take note of which wires are being used on the old jacks.
The blue pair is connected as the primary telephone line. The solid blue wire is the “Ring” and gets connected to the red jack terminal. The white wire with a blue stripe is terminated on the green “Tip” screw.
One pair of wires is used for one telephone line. The pairs of wires are twisted together to avoid cross talk between telephone lines. This helps the sound quality. When looping the bare telephone wire around the terminal screw, loop the wire in the direction that the screw will tighten (Clockwise). This will cause the loop to close on itself and make a better connection.
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| Pair 1 | White with blue stripe |
Blue | ||
| Pair 2 | White with orange stripe |
Orange | ||
| Pair 3 | White with green stripe |
Green | ||
| Pair 4 | White with brown stripe |
Brown |
The solid orange wire is the “Ring” and is connected to the red jack terminal. The white wire with an orange stripe is terminated on the green “Tip” screw.
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A splitter plugged into the jack will enable the use of two separate telephone lines. The solid blue wire is the “Ring” and gets connected to the red jack terminal. The white wire with a blue stripe is terminated on the green “Tip” screw. The solid orange wire is the “Ring” and is connected to the yellow jack screw. The white wire with an orange stripe is terminated on the black “Tip” screw.
A telephone splitter enables the use of both pairs of telephone wires connected to the jack for two separate phone lines. There are many splitter types available. Some can be used on 3 pair and 4 pair jacks.
Cat 5e is available with each pair shielded as well as the whole cable shielded. For average residential telephone installations shielded phone cable is not usually necessary.
I recently purchased a Leviton Decora style telephone jack and the above phone jack wiring diagram was included.
Below is a diagram for four pair wire on a plug and jack. Notice that the blue pair is in the center. You can plug a standard two pair phone plug into this jack for standard phone service.
Every once in a while I find an old Western Electric light gray colored low voltage transformer plugged into an electrical outlet in someone’s basement. One time I recall having one of my regular clients get me over to check their phone wiring after a telephone repair person told them that they had voltage on their phone wires.
I knew exactly what was causing the voltage on the phone wires. It was the above mentioned long forgotten transformer. The original purpose of that transformer was to provide power to a Princess Telephone which had a dial that lit up. Those phones are no longer around, but many of their gray power supply transformers still are. If you see one in your house, just unplug it.
Other wiring diagrams can be found here.
