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(straight-through or cross-over), and the type of device (NIC-type or
HUB/Switch-type) connected to the port.
In what follows, we give pinouts for both MDI (NIC-type) ports and MDI-X
(HUB/Switch-type) ports. We also give cable wiring diagrams for
straight-through and cross-over Ethernet cables.
RJ45 (8-pin, MDI) Port Pinouts
RJ45 (8-pin) to RJ45 (8-pin) Straight-through Cable Wiring
RJ45 (8-pin) to RJ45 (8-pin) Cross-over Cable Wiring
1000BaseT Ethernet Port Connection
1000BaseT data is transmitted on differential TRD+/- signal pairs over
copper wires.
MDI/MDI-X Port Pinouts