reason of TxD+, TxD- and RxD+, RxD- in case of Ethernet

m4rtinm4rtin Member Posts: 170
in CCNP
In case of 10BASE-T or 100BASE-TX the first connector is TxD+ signal, second one is TxD-, third one is RxD+ and sixth connector is RxD- signal. Why there isn't just TxD and RxD like usually serial buses do(for example RS232 or USB)? icon_rolleyes.gif Is this because of balanced pair operation or are there other reasons?
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