Which of the following is the overall structure of the WDM system with N-channel wavelength multiplexing? (Multiple choice)

• A.Monitoring unit
• B.Optical wavelength conversion unit
• C.Intersection unit
• D.Optical amplification unit
• E.WDM unit

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OSN 8800 equipment adopts fan redundancy protection. When any fan in the fan box is broken, the system can still run normally for a long time.

• A.True
• B.False

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Which of the following descriptions about the OTU board is correct? (Multiple choice)

• A.The single board in standard mode is easy to operate and can reduce maintenance costs.
• B.Standard mode has fewer path hierarchies than compatibility mode.
• C.For a single board in compatibility mode, when configuring a cross-connect, the user does not need to care about the logical ports inside the board.
• D.For a single board in standard mode, on the network management, only the service mapping path under the channel or physical port is displayed, and all ODU layers are directly displayed under the physical port.

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Which of the following statements about overhead bytes is wrong?

• A.B1 is Bit Interleaved Parity-8 (BIP-8). This byte is used to monitor the regenerator part layer for bit errors
• B.JO is the regenerator section trace byte. This byte is used to repeatedly send the segment access point identifier so that the receiving end can verify its continuous connection with the designated sending end
• C.A1 and A2 are framing bytes. These bytes are used to separate STM-1 frames in the signal stream
• D.E1 and E2 are wired bytes. These bytes are used to provide voice channels for order line connections.

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FOADM includes parallel FOADM and serial FOADM, both of which support 40 full waves or 80 waves of any wavelength.

• A.False
• B.True

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