This diagram is for a #500 full-modular desk phone (both cords plug in), but hard-wired phones are similar.
The #554 wall phone is wired the same, except for lack of line cord.
It has a sliding plug on the back.
Only the green and red wires are necessary in the line cord (or sliding back plug in a wall phone) for single-line operation.
Some cords and plugs have three, four or six wires.
You can cut off the extras. DON'T cut any wires going to the handset, or
If you are clipping wires, make sure the
copper strands inside the insulation of the black and yellow wires do not
touch each other -- this could kill the second line in a two-line phone jack,
Most of the abbreviations for wire colors above are obvious ("G" is green,
"BK" is black). "S" stands for "slate," which is the same as gray. The phone industry traditionally used
"S" to avoid the confusion with "G" or "GR" which represent green.
Some rotary dials have blue and green wires,
instead of two blue wires as shown. If you have blue and green, it doesn't
matter which you connect to the "F" and "RR" terminals on the network.
If you want to modify a phone so it can't dial
out, don't just disconnect the dial wires. Connect a wire "jumper" from the
"F" to "RR" terminals.