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As far as I know, 10BASE-T and 100BASE-T (types of UTP) use two pairs of wires, while 1000BASE-T has four pairs of wires. But when I look up the photo of 10BASE-T on google, it indeed contains four wire pairs which are four different colours like this below.

10BASE-T

Is it just that it has four pairs of wires but only two of them are used to connect nodes? or Is the photo I found wrong?

A website that confused me. https://www.carleton.edu/sysnet_docs/wiring_docs/10baseTprocs.html#:~:text=Currently%2C%20most%20campus%20computers%20with,cabling%20will%20contain%204%20pairs.

Note that I am not criticizing this website.

I am quite new to network technology. Sorry if this question seems fool.

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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, 6, etc.

The connectors commonly used on the cables are defined by ANSI, and are called TIA-568 or TIA-568A, depending on the polarity.

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  • Might be noteworthy that 10BASE-T (and the previous StarLAN aka 1BASE5) were designed to use the pre-existing and already common twisted-pair installations.
    – Zac67
    Jun 2 at 13:32

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