Talk:Pinout

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Help on RJ45. If there are only four required signals, what the 4 extra wires used for?

Dunno.. could be 4 separate 0v returns--Light current 03:45, 13 December 2005 (UTC)

I think that the RJ45 cable can be used for different purposes. In most cases, only the four innermost wires are used but some applications use the extra wires. This is true for other telecommunications cables, for example telephones use only the inner two wires of the four-wire RJ10 cable.


Are you asking "Why do 10BASE-T and 100BASE-TX only use 4 out of the 8 wires?" To leave the other 4 wires available for other things. What are those other things? Does Varieties_of_Ethernet#Ethernet_over_twisted-pair_cable and Ethernet physical layer answer your question? --70.189.73.224 03:46, 20 August 2006 (UTC)

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