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EIA/TIA-568A and 568B pinouts

Pin	T568A Pair	T568B Pair	1000BASE-T Signal ID	Wire	T568A Color	T568B Color	Pins on plug face (socket is reversed)
1	3	2	DA+	tip	white/green stripe	white/orange stripe
2	3	2	DA-	ring	green solid	orange solid
3	2	3	DB+	tip	white/orange stripe	white/green stripe
4	1	1	DC+	ring	blue solid	blue solid
5	1	1	DC-	tip	white/blue stripe	white/blue stripe
6	2	3	DB-	ring	orange solid	green solid
7	4	4	DD+	tip	white/brown stripe	white/brown stripe
8	4	4	DD-	ring	brown solid	brown solid

RJ45 to balanced audio/XLR

Pin	Analog signal	AES/EBU	T568A Color	T568B Color	Pins on plug face (socket is reversed)
1	L+	AES+	white/green stripe	white/orange stripe
2	L-	AES-	green solid	orange solid
3	R+	n/c	white/orange stripe	white/green stripe
4	Gnd	Gnd	blue solid	blue solid
5	n/c	n/c	white/blue stripe	white/blue stripe
6	R-	n/c	orange solid	green solid
7	-15	-15	white/brown stripe	white/brown stripe
8	+15	+15	brown solid	brown solid

Power over Ethernet, IEEE 802.3af standards A and B

PINS on Switch	T568A Color	T568B Color	10/100 DC on Spares (mode B)	10/100 Mixed DC & Data (mode A)	1000 (1 Gigabit) DC & Bi-Data (mode B)	1000 (1 Gigabit) DC & Bi-Data (mode A)
Pin 1	white/green stripe	white/orange stripe	Rx +	Rx +             DC +	TxRx A +	TxRx A +             DC +
Pin 2	green solid	orange solid	Rx -	Rx -              DC +	TxRx A -	TxRx A -              DC +
Pin 3	white/orange stripe	white/green stripe	Tx +	Tx +             DC -	TxRx B +	TxRx B +             DC -
Pin 4	blue solid	blue solid	DC +	unused	TxRx C +             DC +	TxRx C +
Pin 5	white/blue stripe	white/blue stripe	DC +	unused	TxRx C -             DC +	TxRx C -
Pin 6	orange solid	green solid	Tx -	Tx -             DC -	TxRx B -	TxRx B -             DC -
Pin 7	white/brown stripe	white/brown stripe	DC -	unused	TxRx D +             DC -	TxRx D +
Pin 8	brown solid	brown solid	DC -	unused	TxRx D -             DC -	TxRx D -

Ethernet crossover cables

Two pairs crossed, two pairs uncrossed
10BASE-T or 100BASE-TX crossover

Pin	Connection 1: T568A			Connection 2: T568B			Pins on plug face
	signal	pair	color	signal	pair	color
1	BI_DA+	3	white/green stripe	BI_DB+	2	white/orange stripe
2	BI_DA-	3	green solid	BI_DB-	2	orange solid
3	BI_DB+	2	white/orange stripe	BI_DA+	3	white/green stripe
4		1	blue solid		1	blue solid
5		1	white/blue stripe		1	white/blue stripe
6	BI_DB-	2	orange solid	BI_DA-	3	green solid
7		4	white/brown stripe		4	white/brown stripe
8		4	brown solid		4	brown solid

Gigabit T568A crossover
All four pairs crossed
10BASE-T, 100BASE-TX, 100BASE-T4 or 1000BASE-T crossover (shown as T568A)

Pin	Connection 1: T568A			Connection 2: T568A Crossed			Pins on plug face
	signal	pair	color	signal	pair	color
1	BI_DA+	3	white/green stripe	BI_DB+	2	white/orange stripe
2	BI_DA-	3	green solid	BI_DB-	2	orange solid
3	BI_DB+	2	white/orange stripe	BI_DA+	3	white/green stripe
4	BI_DC+	1	blue solid	BI_DD+	4	white/brown stripe
5	BI_DC-	1	white/blue stripe	BI_DD-	4	brown solid
6	BI_DB-	2	orange solid	BI_DA-	3	green solid
7	BI_DD+	4	white/brown stripe	BI_DC+	1	blue solid
8	BI_DD-	4	brown solid	BI_DC-	1	white/blue stripe

Gigabit T568B crossover
All four pairs crossed
10BASE-T, 100BASE-TX, 100BASE-T4 or 1000BASE-T crossover (shown as T568B)

Pin	Connection 1: T568B			Connection 2: T568B Crossed			Pins on plug face
	signal	pair	color	signal	pair	color
1	BI_DA+	2	white/orange stripe	BI_DB+	3	white/green stripe
2	BI_DA-	2	orange solid	BI_DB-	3	green solid
3	BI_DB+	3	white/green stripe	BI_DA+	2	white/orange stripe
4	BI_DC+	1	blue solid	BI_DD+	4	white/brown stripe
5	BI_DC-	1	white/blue stripe	BI_DD-	4	brown solid
6	BI_DB-	3	green solid	BI_DA-	2	orange solid
7	BI_DD+	4	white/brown stripe	BI_DC+	1	blue solid
8	BI_DD-	4	brown solid	BI_DC-	1	white/blue stripe

Registered Jack (RJ) 11, 14, 25

Position	Pair	T/R	±	RJ11	RJ14	RJ25	25-pair color code	U.S. Bell System colors	German colors	Australian colors
1	3	T	+			T3	white/green	white	violet	orange
2	2	T	+		T2	T2	white/orange	black	green	red
3	1	R	−	R1	R1	R1	blue/white	red	white	blue
4	1	T	+	T1	T1	T1	white/blue	green	brown	white
5	2	R	−		R2	R2	orange/white	yellow	yellow	black
6	3	R	−			R3	green/white	blue	slate	green

Registered Jack (RJ) 21/21X

Female RJ21 connector

Color	Pin (Tip)		Pin (Ring)	Color
White/Blue	26		1	Blue/White
White/Orange	27		2	Orange/White
White/Green	28		3	Green/White
White/Brown	29		4	Brown/White
White/Slate	30		5	Slate/White
Red/Blue	31		6	Blue/Red
Red/Orange	32		7	Orange/Red
Red/Green	33		8	Green/Red
Red/Brown	34		9	Brown/Red
Red/Slate	35		10	Slate/Red
Black/Blue	36		11	Blue/Black
Black/Orange	37		12	Orange/Black
Black/Green	38		13	Green/Black
Black/Brown	39		14	Brown/Black
Black/Slate	40		15	Slate/Black
Yellow/Blue	41		16	Blue/Yellow
Yellow/Orange	42		17	Orange/Yellow
Yellow/Green	43		18	Green/Yellow
Yellow/Brown	44		19	Brown/Yellow
Yellow/Slate	45		20	Slate/Yellow
Violet/Blue	46		21	Blue/Violet
Violet/Orange	47		22	Orange/Violet
Violet/Green	48		23	Green/Violet
Violet/Brown	49		24	Brown/Violet
Violet/Slate	50		25	Slate/Violet

Registered Jack (RJ) 48 48X

Pin	Pair	Signal	Color
1	R	RX Ring	Orange/White
2	T	RX Tip	White/Orange
3		reserved	White/Green
4	R1	TX Ring	Blue/White
5	T1	TX Tip	White/Blue
6		reserved	Green/White
7		shield	White/Brown
8		shield	Brown/White

T-1 (DS-1, DSX-1) cross over cable

Two pairs crossed, two pairs uncrossed
T1 crossover

Pin	Connection 1: T568A		Connection 2: T568B		Pins on plug face
	pair	color	pair	color
1	2	white/orange stripe	1	blue solid
2	2	orange solid	1	white/blue stripe
3	3	white/green stripe	3	white/green stripe
4	1	blue solid	2	white/orange stripe
5	1	white/blue stripe	2	orange solid
6	3	green solid	3	green solid
7	4	white/brown stripe	4	white/brown stripe
8	4	brown solid	4	brown solid

Standard 25 pair wire color code

Commonly used RS-232 signals and pin assignments

Signal		Origin		D-subminiature DB-25	D-subminiature DE-9 (TIA-574)	Modified Modular Jack|MMJ	Modular connector 8P8C ("RJ45")			Modular connector 10P10C ("RJ50")
Name	Abbreviation	DTE	DCE				TIA-561	Yost	Cyclades	National Instruments	Cyclades	Digi
Transmitted Data	TxD	●		2	3	2	6	3	3	8	4	5
Received Data	RxD		●	3	2	5	5	6	6	9	7	6
Data Terminal Ready	DTR	●		20	4	1	3	2	2	7	3	9
Carrier Detect	DCD		●	8	1	—	2	7	7	10	8	10 (alt 2)
Data Set Ready	DSR		●	6	6	6	1		8	5	9	2 (alt 10)
Ring Indicator	RI		●	22	9	—		—	—	2	10	1
Request To Send	RTS	●		4	7	—	8	1	1	4	2	3
Clear To Send	CTS		●	5	8	—	7	8	5	3	6	8
Common Ground	G	common		7	5	3,4	4	4,5	4	6	5	7
Protective Ground	PG	common		1	—	—	—	—	—	—	1	4

Null modem cables and diagrams

Signal Name and Abbreviation		DB-25 Pin	DE-9 Pin	Direction	DE-9 Pin	DB-25 Pin	Signal Name Abbreviation
Frame Ground (chassis)	FG	1	–		–	1	FG
Transmitted Data (TD)	TxD	2	3	→	2	3	RxD
Received Data (RD)	RxD	3	2	←	3	2	TxD
RS-232 Request to Send	RTS	4	7	→	8	5	CTS
RS-232 Clear To Send	CTS	5	8	←	7	4	RTS
Signal Ground	SG	7	5		5	7	SG
Data Set Ready	DSR	6	6	←	4	20	DTR
Data Carrier Detect (CD)	DCD	8	1
Data Terminal Ready	DTR	20	4	→	1	8	DCD
					6	6	DSR

USB connectors and pinouts

File:USB 3.0 Micro B plug.PNG

Micro-B USB 3.0 compatible (cable/male end)
USB 2.0 connector on the side of the specification standard micro USB 3.0 connector are aligned pin-minute increase in the standard.
No.1: power (VBUS)
No.2: USB 2.0 differential pair (D−)
No.3: USB 2.0 differential pair (D+)
No.4: USB OTG ID for identifying lines
No.5: GND
No.6: USB 3.0 signal transmission line (−)
No.7: USB 3.0 signal transmission line (+)
No.8: GND
No.9: USB 3.0 signal receiving line (−)
No.10: USB 3.0 signal receiving line (+)

USB 1.x/2.0 standard pinout

Pin	Name	Cable color	Description
1	VBUS	Red (Orange*)	+5 V
2	D−	White (Gold*)	Data −
3	D+	Green	Data +
4	GND	Black (Blue*)	Ground

• * Some manufacturers use

USB 1.x/2.0 Mini/Micro pinout

Pin	Name	Cable color	Description
1	VBUS	Red	+5 V
2	D−	White	Data −
3	D+	Green	Data +
4	ID	None	Permits distinction of host connection from slave connection * host: connected to Signal ground * slave: not connected
5	GND	Black	Signal ground

Parallel Printer Pinout