Are all four pairs of wires used in a 100BaseT CAT5 environment?

Are all four pairs of wires used in a 100BaseT CAT5 environment?

Are all four pairs of wires used in a 100BaseT CAT5 environment? In other words -- can you use only two pairs to get the full 100BaseT advantage?

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100BASE-T4 utilizes four pair, while 100BASE-TX utilizes two pair of data grade cable.

This was first published in February 2004