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ryd994 The Telecommunications Industry Association (TIA) created and promoted a standard similar to 1000BASE-T that was simpler to implement, calling it 1000BASE-TX (TIA/EIA-854).[20] The simplified design would have, in theory, reduced the cost of the required electronics by only using two unidirectional pairs (one pair TX, one RX) instead of four bidirectional pairs. However, this solution has been a commercial failure, likely due to the required Category 6 cabling and the rapidly falling cost of 1000BASE-T products.
反正又不是我导致了 commercial failure ←_←