Which of the following can be used as the central wavelength of the pump source in EDFA? (Multiple choice).

• A.1510nm
• B.1310nm
• C.1480nm
• D.980 nm

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Coherent receiver technology uses a local oscillator laser with the same frequency as the received signal to perform coherent processing and recover () information from the received signal. (Multi-quality selection.)

• A.Polarized state
• B.Frequency
• C.Amplitude
• D.Phase

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The TAG attribute cannot be set for the internal port VCTRUNK of the single board on the NMS.

• A.True
• B.False

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Compared with dense wavelength division multiplexing (DWDM) systems, crude glass division multiplexing (CWDM) systems provide a certain amount of glass length and transmission distance within (kmkm), which greatly reduces system cost and has strong flexibility

• A.200
• B.50
• C.100
• D.20

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According to the formula "ODUk rate = 239/(239k) x STM-N frame rate", ODU4 The rate is equal to the 239/235xSTM-N Pa rate.

• A.False
• B.True

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