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VCE
In a WDM system, after a distance of transmission, the OSNR of the signals at the receive end decreases to a certain extend. Which of the following is the main cause?
A. Use of EDFA
B. The fiber attenuation is too large.
C. New optical fiber is not used.
D. Use of Demultiplexer Multiplexer
Before the optical power commissioning of an ROADM board, you need to configure virtual optical-layer services. Otherwise, the ROADM board blocks all wavelengths by default.
A. True
B. False
Which of the following standards must be met for the isolation test in the feature test of the multiplexer/ demultiplexer?
A. <20dB
B. >25dB
C. >20dB
D. <25dB