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A transmission line may refer to a cable or assembly that is designed to carry radio frequencies and must consider the wave nature of the signal. Coaxial cable is an example of a transmission line. It may also refer to high-voltage power transmission lines, used to transfer power from generating stations to consumers.

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How to measure the actual length of a long twisted pair?

I used the 2 probes of an oscilloscope to measure the propagation delay and found 16ns for a 1.8m long (external) Ethernet cable (and 26ns for 3m). Either vp=1.1e8 m/s (not the expected 2/3 co=2e8 m/s …
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