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Review Questons 1. The original commercial version of Ethernet supported 10 Mbps bandwidth; the version introduced in the early 1990s supports 100 Mbps; and in 1998, Gigabit Ethernet was introduced. All versions use the same data frame formats, with the same maximum PDU sizes, so they can interoperate freely.
So, to answer your question, 100 Mbps uses four wires, while gigabit networking uses all 8 wires. So it depends on what network you are running. Feb 14, 2014, 6:54 AM. mbreslin1954 said: It's not the cabling that uses the wires, it's the networking standard being used, such as 10BaseT, 100BaseT, gigabit Ethernet, etc. The physical networking going on determines how many pairs of wires are used, the cabling just supplies the wiring along with other characteristics.