Using the path method to create a Client path fails. What are the possible reasons? (Multiple choice)

• A.There is no complete OCh path
• B.Physical connection lacking between boards
• C.FEC mode does not match at both ends of the transceiver
• D.The channel has been used up

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Which of the following statements about the modulation technologies of the 40Gbit/s and 100Gbit/s coherent systems are correct?

• A.The modulation technology used in a 40G coherent system is ePDM-QPSK.
• B.The modulation technology used in a 100G coherent system is ePDM-QPSK.
• C.The modulation technology used in a 100G coherent system is ePDM-BPSK.
• D.The modulation technology used in a 40G coherent system is ePDM-BPSK.

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Loopback is a common operation for routine maintenance and troubleshooting. Which of the following statements about loopback operations are incorrect?

• A.The hardware loopback is performed by using the fiber jumper or self-loop cable to perform the loopback on the optical port or electrical port.
• B.When performing a hardware loopback on an optical port, you need to add an optical attenuator.
• C.After the outloop is performed, the signals are transmitted to the internal.
• D.After the inloop is performed, the signals are transmitted to the external.

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Which of the following subracks does not support the configuration of packet board?

• A.OSN 9800 P18
• B.OSN 1800V
• C.OSN 1800II
• D.OSN 8800 T16

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Which of the following service layer paths is required when creating OCh using the path method?

• A.OMS
• B.OTS
• C.Client
• D.ODUk

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