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Questions about the electrical implementation of Ethernet; ask another Stack Exchange for software or protocol questions. Specify the speed as 10/100BASE-T is somewhat different from 1000BASE-T, apart form the speed. Those are copper standards; Ethernet over fiber optical cable is also defined.
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Using only 2 pairs of Ethernet
If you look at Siemens Profinet Cable, which is basically Ethernet, you'll see 2-pair cable used. It works with regular ethernet devices as well. …