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Which phenomenon limits data propagation speed in long copper Ethernet cables exceeding 100 meters?

A)Skin effect induced signal attenuation
B)Capacitive coupling causing cross-talk
C)Electromagnetic interference from external sources
D)Resistive heating reducing insulation effectiveness

💡 Explanation

When signal frequency increases in long cables, the skin effect concentrates current flow near the conductor surface because of self-inductance, which increases effective resistance and signal attenuation. Therefore skin effect attenuation limits signal propagation, rather than crosstalk, external interference, or insulation breakdown, which result via alternative mechanisms.

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