Ethernet 100Base-T4

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thumb|right|240px|8P8C modular plug pin positioning

RJ45 FEMALE CONNECTOR 8 pin RJ45 (8P8C) female connector at the network interface cards/hubs.

RJ45 MALE CONNECTOR 8 pin RJ45 (8P8C) male connector at the cables.

100BASE-T4 is an early implementation of Fast Ethernet. It used only two of the four twisted copper pairs and works with category 3 cable.

Pin Name Description TIA/EIA 568A TIA/EIA 568B
1 TX_D1+ Tranceive Data+ Pair 3 Wire 1 white/green Pair 2 Wire 1 white/orange
2 TX_D1- Tranceive Data- Pair 3 Wire 2 green Pair 2 Wire 2 orange
3 RX_D2+ Receive Data+ Pair 2 Wire 1 white/orange Pair 3 Wire 1 white/green
4 BI_D3+ Bi-directional Data+ Pair 1 Wire 2 blue Pair 1 Wire 2 blue
5 BI_D3- Bi-directional Data- Pair 1 Wire 1 white/blue Pair 1 Wire 1 white/blue
6 RX_D2- Receive Data- Pair 2 Wire 2 orange Pair 3 Wire 2 green
7 BI_D4+ Bi-directional Data+ Pair 4 Wire 1 white/brown Pair 4 Wire 1 white/brown
8 BI_D4- Bi-directional Data- Pair 4 Wire 2 brown Pair 4 Wire 2 brown

Notes

  • T568A and T568B are the two color codes used for wiring eight-position RJ45 modular plugs. Both are allowed under the ANSI/TIA/EIA wiring standards. The only difference between the two color codes is that the orange and green pairs are interchanged. T568A wiring pattern is recognized as the preferred wiring pattern for this standard because it provides backward compatibility to both one pair and two pair USOC wiring schemes. The T568B standard matches the older ATA&T 258A color code and is/was(?) the most widely used wiring scheme. It is also permitted by the ANSI/TIA/EIA standard, but it provides only a single pair backward compatibility to the USOC wiring scheme. The U.S. Government requires the use of the preferred T568A standard for wiring done under federal contracts.
  • One pair is reserved for transmit and one for receive. The other two pair are not used for 100Mbit transmission. They are usually connected for upward compatibility with 1 Gigabit Ethernet.

References

Category:Networking Connectors

 

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