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Question 29/60
The difference threshold between the working and protection channels in 5 dB. The initial optical power on both channels is 2 dBm. When the fiber attenuation of the working channel increases, its optical power changes to -4 dBm and the optical power of the protection channel remains unchanged. This triggers optical line protection switching.
Correct Answer: A
The power difference becomes 6 dB (2 dBm - (-4 dBm) = 6 dB), which exceeds the 5 dB threshold, so protection switching occurs.
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