User’s Manual of GS-4210 Series
APPENDIX A Switch's RJ45 Pin Assignments
A.1 1000Mbps, 1000BASE-T
Contact MDI MDI-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.
A.2 10/100Mbps, 10/100BASE-TX
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 RJ45 receptacle/
connector and their pin assignments:
RJ45 Connector pin assignment
Contact MDI
Media Dependent Interface
MDI-X
Media Dependent
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
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