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1. Solid Color Cabling
   1. Four Wire cable (two lines)
   2. Original Eight Wire cabling
2. Category 5 cabling
3. Household Telephone Wiring Diagram

Solid Color Cabling

Four Wire Cables

The chart above shows basic telephone wiring on a four wire jack. You only use two wires to make a phone line. To wire an extension for a phone line you must extend the loop by wiring in the same color wire at the jack.

Eight Wire Cabling

Striped Cabling

Wire Pair	Wire	Tip/Ring
1	1			T
	2			R
2	3			T
	4			R
3	5			T
	6			R
4	7			T
	8			R

 

Household Wiring Diagram

On standard 4-wire solid color wiring (common in most households) you can wire up your jacks as follows. Just remember that red and green make a pair. Also remember that black and yellow make a pair.

You must swap the tip and ring for the correct pair with the other pair when converting between extensions.

Wiring Jack 2-lines	Wiring Jack Line 1 only w/ Extension	Wiring Jack Convert Line 1 to Line 2
\ \ T  R Line 2  T R Line 1 / /	\ \ T R Line 2 T R Line 1 T R / \/ \_______/__/ __/\________/	________ / \ \ /\ /-------\--\ T  R Line 2 T R T R Line 1 T R / \/ \_______/__/ \________/
TIP	= GREEN / BLACK	LINE 1 PAIR = GREEN/RED
RING	= RED / YELLOW	LINE 2 PAIR = BLACK/YELLOW

Always keep in mind that someone else may have screwed up the wiring before you got there. Be prepared with a throwaway phone to test out the connection yourself as you build the connection.