Telephone Wiring Color Code

The Backside of a Residential Telephone Jack
The Backside of a Residential Telephone Jack
Front of the phone jack
“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.
Rear of phone jack with blue pair attached
The blue pair is connected as the primary telephone line
Tip +
Ring –
Cat 3

Green

Red
Cat 3

Black

Yellow
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

 

Here the orange pair is connected as the primary telephone line
Here the orange pair is connected as the primary telephone line
The blue pair and orange pair are both connected to the telephone jack.
The blue pair and orange pair are both connected to the telephone jack. A splitter plugged into the jack will enable the use of two separate telephone lines.
A telephone jack splitter
A telephone jack splitter enables two lines to be used from one wall jack
Cat 5e four twisted pair unshielded telephone wire
Cat 5e four twisted pair unshielded telephone wire
Placement of 4 pairs on a jack or a plug
Placement of 4 pairs on a plug or a jack