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← ScienceWhich consequence results when a long signal cable’s impedance mismatches an Ethernet PHY during gigabit propagation?
A)Increased bit error rate✓
B)Reduced transient thermal resistance
C)Oversaturation of amplifier stages
D)Enhanced electromagnetic interference (EMI)
💡 Explanation
Increased bit error rate results because signal reflections occur at the impedance discontinuity, via wave interference. This mechanism, known as reflection coefficient, raises the effective noise floor therefore bit errors increase, rather than amplifier saturation, which would require a different cause.
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