APPENDIX A RJ-45 PIN SPECIFICATION
When connecting your FSD-series 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
Contact
MDI
Media Dependant
Interface
MDI-X
Media Dependant
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
Note:
Contact 4, 5, 7, 8 is not used for port # 2 to port #8. And will be used in port#1 (POE port) for
IEEE802.3af power transmission.
The standard cable, RJ-45 pin assignment
The standard RJ-45 receptacle/connector