I know that pair 3 in T568A is used for transmitting data while pair 2 is used for receiving data. In T568B the logic is reverse, meaning pair 2 is for Tx and pair 3 is for Rx.
What's the purpose of the blue and brown pairs?
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3\$\begingroup\$ They are used in 1000Base-T, e.g. as shown at Ethernet 1000Base-T (Gigabit ethernet) pinout. \$\endgroup\$– Andrew MortonJul 21, 2019 at 18:44
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1 Answer
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10BaseT and 100BaseT Ethernet uses only 2 pairs (pins 1,2,3,6).
Standard telephone uses blue wiring (pins 4 and 5).
Gigabit Ethernet and HDBaseT uses all 4 pairs.
Some other configurations exist as well.
