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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