Nortel Networks 10BASE-T Uživatelský manuál stáhnout pdf (Strana 310)

Using the BayStack 410-24T 10BASE-T Switch

D-2

309985-C Rev 00

Table D-1 lists the RJ-45 (8-pin modular) port connector pin assignments.

MDI and MDI-X Devices

Media dependent interface (MDI) is the IEEE standard for the interface to

unshielded twisted pair (UTP) cable.

For two devices to communicate, the transmitter of one device must connect to the

receiver of the other device. The connection is established through a crossover

function, which can be a crossover cable or a port that implements the crossover

function internally.

Ports that implement the crossover function internally are known as MDI-X ports,

where X refers to the crossover function.

The following sections describe the use of straight-through and crossover cables

for connecting MDI and MDI-X devices.

Table D-1. RJ-45 Port Connector Pin Assignments

Pin Signal Description

1 RX+ Receive Data +

2 RX- Receive Data -

3 TX+ Transmit Data +

4 Not applicable Not applicable

5 Not applicable Not applicable

6 TX- Transmit Data -

7 Not applicable Not applicable

8 Not applicable Not applicable

Note:

For the transmitter of one device to connect to the receiver of another

device, the total number of crossovers must always be an odd number.

1 2 ... 305 306 307 308 309 310 311 312 313 314 315 ... 329 330

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Nortel Networks 10BASE-T Uživatelský manuál Strana 310