CAT5

CAT5/5e/6 Cable / RJ-45 Connector

RJ 45:
(RJ xx: telephone connection interfaces, registered with the FCC, the U.S. Federal Communications Commission.)
Pins: looking at the wiring end of a plug with the latch down, pin 1 is on the left.

CAT6 essentially obsoletes the CAT5 standard and will obsolete the CAT5e standard. CAT6 was introduced with the publication of the TIA standard 568-B2-1 (June 20, 2002). The bandwidth is more than doubled from 100MHz to 250MHz and the connector insertion loss and the crosstalk is improved.

CAT5: 4 Twisted Pairs at 24 AWG

pair 1: blue
pair: 2 orange
pair: 3 green
pair: 4 brown
(twisted about 3 times per inch)

Straight Ethernet Cable

Cross-Cable

Ethernet uses only pair 3 (green, on pins 1 and 2), and pair 2 (orange, on pins 3 and 6).

EIA/TIA specifies RJ-45 (ISO 8877) connectors for UTP cable (unshielded twisted pair).

Impedance: 100 Ohms
Max length of a segment: 100 meters/330 feet
Frequency rating: 100MHz
Capacitance 13.5 to 17 picofarads per foot
Attenuation 23 to 67dB per 1000 feet
Crosstalk 32 to 51 dB at 1000 feet

CAT 5 Cable Specifications:

Frequency	Max. Attenuation per 1000 ft/ 304 m	Resistance per 1000 ft/ 304 m	Capacitance	Impedance
4 MHz	13 dB	28,6 ohms	14 pF/ft	100 ohms
10 MHz	20 dB	28,6 ohms	14 pF/ft	100 ohms
20 MHz	28 dB	28,6 ohms	14 pF/ft	100 ohms
100 MHz	67 dB	28,6 ohms	14 pF/ft	100 ohms

CAT 3, 4, 5, 5e, 6, 7 Cable Specifications:

Category	Type	Spectral B/W	Length	LAN Applications	Notes
Cat3	UTP	16 MHz	100m	10Base-T, 4Mbps	Telephone Cables
Cat4	UTP	20 MHz	100m	16Mbps	Rarely Used
Cat5	UTP	100MHz	100m	100Base-Tx,ATM, CDDI	LAN
Cat5e	UTP	100MHz	100m	100Base-T	LAN
Cat6	UTP	250MHz	100m	1000Base-T	LAN
Cat7	ScTP	600MHz	100m	1000Base-T	LAN

CAT 5, 5e, 6 Detailed Cable Specifications:

	CAT 5	CAT 5e	CAT 6
Frequency	100 MHz	100 MHz	250 MHz
Attenuation (Min. at 100 MHz)	22 dB	22 dB	19.8 dB
Characteristic Impedance	100 ohms ą 15%	100 ohms ą 15%	100 ohms ą 15%
NEXT (Min. at 100 MHz)	32.3 dB	35.3 dB	44.3 dB
PS-NEXT (Min. at 100 MHz)	no specification	32.3 dB	42.3 dB
ELFEXT (Min. at 100 MHz)	no specification	23.8 dB	27.8 dB
PS-ELFEXT (Min. at 100 MHz)	no specification	20.8 dB	24.8 dB
Return Loss (Min. at 100 MHz)	16.0 dB	20.1 dB	20.1 dB
Delay Skew (Max. per 100 m)	no specification	45 ns	45 ns

CAT5 Connection Table - RJ 45 -

RJ 45	Pin	1	2	3	4	5	6	7	8
Code EIA/TIA-568-A	Pair	3 T	3 R	2 T	1 R	1 T	2 R	4 T	4 R
	Color	wt/gn	gn	wt/or	bl	wt/bl	or	wt/br	br
Code EIA/TIA-568-B	Pair	2 T	2 R	3 T	1 R	1 T	3 R	4 T	4 R
	Color	wt/or	or	wt/gn	bl	wt/bl	gn	wt/br	br

T568B is identical to T568A except that pairs 2 (orange) and 3 (green) are swapped.

ATTENTION !! The different USOC (Universal Service Order Code) Standard:

RJ 45 Pin	1	2	3	4	5	6	7	8
Pair	4 T	3 T	2 T	1 R	1 T	2 R	3 R	4 R
Color Code USOC	wt/br	wt/gn	wt/or	bl	wt/bl	or	gn	br

ISDN BRI RJ45 Standard (574616-MO97):

RJ 45 Pin		1	2	3	4	5	6	7	8
Pair				Tx+	Rx +	Rx -	Tx -

Cat5 Wiring Standards, Listed

Pin	EIA/TIA 568A	AT&T 258A, EIA/TIA 568B	10Base-T 10Mbps Cat3	100Base-TX 100Mbps Cat5	100Base-T4 100Mbps Cat3	100Base-T2 100Mbps Cat3	1000Base-T 1Gbps Cat5+
1	white/green	white/orange	TX+	TX+	TX D1+	BI DA+	BI DA+
2	green/white	orange/white	TX-	TX-	TX D1-	BI DA-	BI DA-
3	white/orange	white/green	RX+	RX+	RX D2+	BI DB+	BI DB+
4	blue/white	blue/white	na	na	BI D3+	na	BI DC+
5	white/blue	white/blue	na	na	BI D3-	na	BI DC-
6	orange/white	green/white	RX-	RX-	RX D2-	BI DB-	BI DB-
7	white/brown	white/brown	na	na	BI D4+	na	BI DD+
8	brown/white	brown/white	na	na	BI D4-	na	BI DD-
BI=BI directional data RX=Receive Data TX=Transmit Data

10BaseT and 100BaseT Cross Cable
Pin	Color Code	Color Code	Pin
1	White/Orange	White/Green	1
2	Orange	Green	2
3	White/Green	White/Orange	3
4	Blue	Blue	4
5	White/Blue	White/Blue	5
6	Green	Orange	6
7	White/Brown	White/Brown	7
8	Brown	Brown	8