Hp NC3131 Fast Ethernet Server Adapter Manual de usuario descargar pdf (Pagina 28)

Specifications C-5

RJ-45 Pinouts and Crossover Function

10BASE-T, 100BASE-TX, and 1000BASE-T are keyed systems to differentiate between voice

and data transmissions, in order to keep them separate over twisted-pair cable. The Ethernet

standard also specifies that each cable segment implement a crossover function to connect the

transmitter of one device to the receiver of a device at the other end, and vice-versa. The

crossover function may be implemented internally at the hub or switch, or externally, through

the twisted-pair media.

10/100 Straight-Through Pinouts

If the crossover function is implemented internally, the port is labeled MDI-X (Medium

Dependent Interface–Crossover). When an MDI-X port is connected to an MDI port, the twisted

pair media should be wired straight-through using the physical pinouts indicated in Table C-9.

Table C-9

10/100 Pinouts Using Internal, Straight-Through Crossover

Pin Function Color Match Function Pin

1 TD+ White/Orange TD+ 1

2 TD- Orange/White TD- 2

3 RD+ White/Green RD+ 3

4 Blue/White 4

5 White/Blue 5

6 RD- Green/White RD- 6

7 White/Brown 7

8 Brown/White 8

Figure C-1 shows straight-through connector wiring to be used when the crossover function is

implemented within the hub or switch.

Figure C-1. 10/100 straight-through wiring for RJ-45 connector

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