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You are correct that 10Base-T and 100Base-Tx use two pairs for communication, while 1000Base-T uses all four. You may be confused because you're conflating different standards for different items. 10Base-T, 100Base-Tx, etc., are signaling and electrical standards from IEEE (802.3i). The cable itself is defined by ISO/IEC 11801, and is called Category 5, 5e, ...

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