For NG-SDH equipment equipped with dual main control, when the main control board is upgraded, which of the following statement is correct?

For NG-SDH equipment equipped with dual main control, when the main control board is upgraded, which of the following statement is correct?A . After completing the upgrade of the standby main control board, the original active main control can be upgraded if the standby main control board is switched.B . Upgrade the active main...

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For 10G and coherent 100G mixed transmission systems, which of the following description is correct?

For 10G and coherent 100G mixed transmission systems, which of the following description is correct?A . It is recommended to use a long wavelength for the 10G channel and a short wavelength for the 100G channel.B . Commissioning is based on 100G commissioning requirements, that is, non-standard fiber optic power commissioning.C . For 100G...

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