INDEX	Jacks	8 position 8 conductor -->	568B | USOC
		6 position 6, 4, or 2 conductor -->	6c USOC | 4c USOC | 2c USOC
	Plugs	8 position 8 conductor -->	568B | USOC
		6 position 6 conductor -->	USOC
	103 blocks	4 pair -->	568B | USOC
		3 pair -->	USOC
	general	25 pair color code

Jacks

8 position 8 conductor (4 pair) designations, 258A and 568B

JACK DESIGNATIONS AT&T 258A EIA 568B	DESIGNATION	JACK PIN #	NUMBER ON 103 BLOCK WITH 8-POS JACK	STANDARD WIRING COLOR CODE		PAIR
	T	1	3	white/orange		2
	R	2	4	orange/white		2
	T	3	5	white/green		3
	R	4	2	blue/white		1
	T	5	1	white/blue		1
	R	6	6	green/white		3
	T or -48v battery	7	7	white/brown		4
	R or -48v ground	8	8	brown/white		4

8 position 8 conductor (4 pair) designations, USOC

JACK DESIGNATIONS USOC	DESIGNATION	JACK PIN #	NUMBER ON 103 BLOCK WITH 8-POS JACK	STANDARD WIRING COLOR CODE		PAIR
	T	1	1	white/brown		4
	T	2	2	white/green		3
	T	3	3	white/orange		2
	R	4	4	blue/white		1
	T	5	5	white/blue		1
	R	6	6	orange/white		2
	R	7	7	green/white		3
	R	8	8	brown/white		4

6 position 6 conductor (3 pair) designations, USOC

JACK DESIGNATIONS USOC RJ25C	DESIGNATION	JACK PIN #	STANDARD WIRING COLOR CODE		PAIR
	T	1	white/green		3
	T	2	white/orange		2
	R	3	blue/white		1
	T	4	white/blue		1
	R	5	orange/white		2
	R	6	green/white		3

6 position 4 conductor (2 pair) designations, USOC

JACK DESIGNATIONS USOC RJ14C	DESIGNATION	JACK PIN #	STANDARD WIRING COLOR CODE		PAIR
	T	1	white/orange		2
	R	2	blue/white		1
	T	3	white/blue		1
	R	4	orange/white		2

6 position 2 conductor (1 pair) designations, USOC

JACK DESIGNATIONS USOC RJ11C	DESIGNATION	JACK PIN #	STANDARD WIRING COLOR CODE		PAIR
	R	1	blue/white		1
	T	2	white/blue		1

Plugs

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8 position 8 conductor (4 pair) designations, 258A and 568B

PLUG DESIGNATIONS AT&T 258A EIA 568B

8 position 8 conductor (4 pair) designations, USOC

PLUG DESIGNATIONS USOC

6 position 6 conductor (3 pair) designations, USOC

PLUG DESIGNATIONS USOC

Connecting blocks

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8 conductor (4 pair) 103 block wiring, 258A and 568B

8 PIN 103 BLOCK WIRING
STANDARD: AT&T 258A / EIA 568B PLUG: 8 POSITION 8 CONDUCTOR JACK TYPE: 103 STYLE, SCREW or IDC

8 conductor (4 pair) 103 block wiring, USOC

8 PIN 103 BLOCK WIRING
STANDARD: USOC PLUG: 8 POSITION 8 CONDUCTOR JACK TYPE: 103 STYLE, SCREW or IDC

6 conductor (3 pair) 103 block wiring, USOC

6 PIN 103 BLOCK WIRING
STANDARD: USOC PLUG: 6 POSITION 6 CONDUCTOR JACK TYPE: 103 STYLE, SCREW or IDC

25 pair color code

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25 PAIR COLOR CODE

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