Which of the following boards can be inserted on the OSN 9800 U64 subrack?

• A.TNV1N401
• B.TN54GS4
• C.TNF 5UNQ2
• D.TN18LSC

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On the ROADM board, you need to configure the virtual optical layer service before the optical power is commissioned. Otherwise, the ROADM limit board blocks all wavelengths by default.

• A.TRUE
• B.FALSE

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For the whole network error test in the commissioning test, which of the following statement is correct? (Multiple choice)

• A.When the single channel error test is performed, the remote end needs to perform hardware loopback on the tributary board client side.
• B.The duration of the full channel error test is 20 hours. If the error occurs within 20 hours, it needs to be retested for 20 hours after troubleshooting.
• C.To ensure the smooth passage of all channel services across the entire network, a 10-minute error prediction is required for each single channel.
• D.The number of OTU boards or tributary boards connected in series for the whole channel error test is recommended to be no more than 13

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The lower the noise figure of the amplifier, the less noise is introduced by this amplifier.

• A.TRUE
• B.FALSE

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ESC can also be used at OLA sites.

• A.False
• B.True

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