8. RJ-45 PIN ASSIGNMENT

Pin

Numbered Ports

Uplink Port (MDI-II port)

(MDI-X port)

 

 

1

Input Receive Data +

Output Transmit Data+

2

Input Receive Data -

Output Transmit Data-

 

 

 

3

Output Transmit Data+

Input Receive Data +

6

Output Transmit Data-

Input Receive Data -

 

 

 

4,5,7,8

Not used

Not used

 

 

 

Schematics for both straight and crossover twisted-pair cable are shown below. (Note that crossover cable is only required if you cascade hubs via the RJ-45 station ports; i.e. the Uplink port is not used.)

8.1 Straight-Through/Crossover Cable

The pin assignment of the cables both ends should be as below:

 

Straight-through

Crossover

 

Hub (MDI-X)

Adapter(MDI-II)

Hub (MDI-X)

Hub (MDI-X)

 

Pin 1

 

Pin 1

Pin 1

Pin 3

 

Pin 2

 

Pin 2

Pin 2

Pin 6

 

Pin 3

 

Pin 3

Pin 3

Pin 1

 

Pin 6

 

Pin 6

Pin 6

Pin 2

6

32 1

 

 

 

 

 

6

32 1

 

 

 

6 3 2 1

30

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