In an OA-free system, the lower threshold of the receive optical power of a line board or the WDM side of an OTU board Is the optical module's receiver sensitivity plus 3 dB.

• A.TRUE
• B.FALSE

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Which of the following logical function modules are involved in processing clock signals? (Multiple choice)

• A.SPI
• B.SETS
• C.MCF
• D.RST

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Which of the following statements about pointer adjustment is correct? (Multiple choice)

• A.Pointer adjustments have nothing to do with payload content
• B.When the pointer is being adjusted, the information payload in the information payload area will decrease
• C.The information payload in the information payload area will not change when the pointer is not adjusted
• D.When the pointer is being adjusted, the information payload in the information payload area will increase

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Which of the following functions are mainly performed in the sink function processing of the electrical layer overhead? (Multiple choice)

• A.Realize the suppression of alarms and the reporting of performance events
• B.Back-insert or down-insert signal
• C.Overhead Monitoring at the Receiver
• D.Reporting of defect information

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In the case of 1+1 linear MSP, which of the following switching modes does not need to enable the APS protection protocol? (Multiple choice)

• A.Double-ended non-reply mode
• B.Double-ended reply mode
• C.Single-ended non-reply mode
• D.Single-ended reply mode

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