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1000Mbps, 1000Base T

ContactMDIMDI-X

 

 

 

1

BI_DA+

BI_DB+

 

 

 

2

BI_DA-

BI_DB-

 

 

 

3

BI_DB+

BI_DA+

 

 

 

4

BI_DC+

BI_DD+

 

 

 

5

BI_DC-

BI_DD-

 

 

 

6

BI_DB-

BI_DA-

 

 

 

7

BI_DD+

BI_DC+

 

 

 

8

BI_DD-

BI_DC-

 

 

 

Implicit implementation of the crossover function within a twisted-pair cable, or at a wiring panel, while not expressly forbidden, is beyond the scope of this standard.

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When connecting your 10/100Mbps Ethernet Switch to another switch, a bridge or a hub, a straight or crossover cable is necessary. Each port of the Switch supports auto-MDI/MDI-X detection. That means you can directly connect the Switch to any Ethernet devices without making a crossover cable. The following table and diagram show the standard RJ-45 receptacle/ connector and their pin assignments:

RJ-45 Connector pin assignment

 

 

MDI

MDI-X

 

 

Contact

Media Dependant

Media Dependant

 

 

 

Interface

Interface -Cross

 

 

 

 

 

 

 

1

Tx + (transmit)

Rx + (receive)

 

 

 

 

 

 

 

2

Tx - (transmit)

Rx - (receive)

 

 

 

 

 

 

 

3

Rx + (receive)

Tx + (transmit)

 

 

 

 

 

 

 

4, 5

Not

used

 

 

 

 

 

 

 

6

Rx - (receive)

Tx - (transmit)

 

 

 

 

 

 

 

7, 8

Not

used

 

 

 

 

 

 

The standard cable, RJ-45 pin assignmentThe standard RJ-45 receptacle/connector

There are 8 wires on a standard UTP/STP cable and each wire is color-coded. The following shows the pin allocation and color of straight cable and crossover cable connection:

45