You should disconnect the main phone line from the source before continuing wiring a phone jack. This method would add an additional line within the building.

Rj11 Phone To Rj45 Jack
Fax line wiring diagram. You will have a wide variety of telephone jacks to choose from but the wiring for a single line phone service will be standard. A single line configuration redgreen uses the two pins in the center of the connectors. How to wire a phone jack voice or telephone rj 11 thru rj 14 usoc wiring diagram telephone wiring for a phone outlet is typically either 1 2 or 3 pairs 2 4 or 6 conductor. In a two line configuration the second line blackyellow uses the two pins to the outside of the center two pins. A wiring diagram is a simplified traditional pictorial representation of an electric circuit. There may be instances where you may need to connect to or transpose from the old quad cable.
Each line uses one pair 2 wires for a voice or fax connection. Option 2 run a brand new line from the phone box to the destination phone jack. Wiring inside of the building is the largest unpredictable cost when adding a fax line. Line 2 uses the black and yellow wires. Keep in mind that the colors of the telephone wiring in your home will be typically one of two types or insulation colors. There will be a small box with a phone line going in and coming out.
It can put a phone line and fax line right next to each other. It shows the elements of the circuit as simplified shapes as well as the power and signal connections between the tools. The phone line usually comes in by your electrical panel. Wiring a jack is not difficult and it is totally fine to add a new jack or internet phone jack to your system. Most cable nowadays is utp unshielded twisted pair. Line one uses the red and green wires.
Variety of phone line wiring diagram.