CAT 5 / 5e / 6 / 6A / 6A / 7 Cable    -     RJ-45 Connector



RJ45

(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.



CAT5/6/7  -  4 Twisted Pairs
pair 1: blue
pair: 2 orange
pair: 3 green
pair: 4 brown
(twisted about 3 times per inch)
10Mbit, 100Mbit Ethernet uses only pair 2 and 3 (orange and green).




TIA/EIA-568   -A / -B / -C

The wiring standard is defined by TIA/EIA-568. In 1991 the first revision of the standard, TIA/EIA-568-A was released. In 2001 TIA/EIA-568-B was released. In 2008 (?) the new version TIA/EIA-568-C was released. The standard now defines that the wiring by color code 568-B is completely deprecated, not valid anymore. The only valid color code for structured wiring with twisted pair cable CAT 5/6/7 shall be the same color code as with the older 568-A !!



Pin and Color Assignment

TIA/EIA-568-A, TIA/EIA-568-CTIA/EIA-568-B




Ethernet Connector Pin Assignment
RJ45 PinWire Color (568-C)10, 100BaseT Tx, RxGbit Ethernet
1white/greenTx +BI_DA+
2greenTx -BI_DA-
3white/orangeRx +BI_DB+
4Blue BI_DC+
5white/blue BI_DC-
6orangeRx -BI_DB-
7white/brown BI_DD+
8brown BI_DD-




Straight and Cross Cable

Straight Ethernet Cable TIA/EIA-568-A and C Cross-Cable Gigabit (!) Ethernet TIA/EIA-568-A and C




Cable Specifications

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 15%

100 ohms 15%

100 ohms 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





ISDN BRI RJ45 Standard (574616-MO97)

RJ 45 Pin

1 2 3 4 5 6 7 8

Pair

    Tx+ Rx + Rx - Tx -