The propagation velocity of an electromagnetic wave in a cable, depends on the cable lenght (like traveling through the cable) or in the distance between the measurments (like speed of causality)?
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Generally speaking speed depends on the properties of the cable, mainly its refractive index. In fibre optics refractive index can vary with radius, helping signals to traverse curves. The distance over which the velocity is measured is not relevant in the general case.
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