What Are The 4 Wires In A Phone Line

Red green black and yellow.

The wire pair colors are blue orange green and brown. 6p4c for rj14 two telephone lines 6p6c for rj25 three telephone lines 8p8c for rj61 x four telephone lines rj48 s and rj48c for four wire data lines rj31 x single telephone line with equipment disconnect rj38 x similar to rj31x but with continuity circuit. Red green yellow and black. This is just a safety precaution as it will disconnect the power flowing from the phone company line.

2 wire is for analog phone direct connect to telephone company. Line 1 uses the red green pair. The blue pair is connected as the primary telephone line. In older telephone installations the phone cable typically has four wires inside.

This arrangement allows most normal houses to handle two phone lines very easily. One pair of wires is used for one telephone line. The red and green wires are on the two center terminals of a normal phone jack and the black and yellow wires are on the two outer terminals. Unplug the phone company line.

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If you re extending a line to a room or other part of the house you can use this type of cable or you can use newer category 3 or 5 cat 3 or cat 5 data cable which also has multiple wires but with a different color scheme. Before you begin your wiring project you ll need to unplug the phone company line that is plugged into the jack inside the box. Older telephone wiring was a basic cat 3 4 conductor or 2 pairs with red green black yellow. In a typical home the telephone cables connecting your phones within you home contain four wires.

How to wire a 4 wire phone jack connection you are right there are only two wires needed for a phone line to work. They are used in pairs for each phone line you have. The solid blue wire is the ring and gets connected to the red jack terminal. Newer homes can have anything from cat 3 3 pair on up to cat 5e with 4 pairs with the insulation colors being a combination of solid and solid with white for each wiring pair.

There are always at least one spare pair to be used for a second line. Repairmen in fact refer to the wires in terms of pairs so technically a standard four wire telephone line has two pairs. This line must be plugged back in once you ve completed the wiring.