Which of the following will cause a BEFFEC_EXC alarm to be reported on a single channel?

• A.Signal loss is too large during line transmission
• B.The input optical power of the OTU board is too high or too low
• C.Faulty amplifier board
• D.Abnormal external environment

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Which of the following descriptions about electrical layer scheduling is wrong?

• A.All cross-connects need to be configured on the network management system.
• B.In the aggregation mode application scenario, it is necessary to cross within the board first, and then cross between boards.
• C.Inter-board cross-connect refers to the cross-connect configured between different boards. Inter-board cross-connection dispatches ODUk services between boards in a subrack through the backplane and centralized cross-connection boards.
• D.TTA and TDC boards support aggregation mode and non-aggregation mode.
• E.Intra-board cross-connect refers to the cross-connect configured between different ports on the same board.

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Which of the following functions does EX40 increase compared to X40?

• A.Support single-channel optical power monitoring
• B.The number of multiplexing and demultiplexing waves is more
• C.Occupies fewer slots
• D.Support optical layer crossover

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Which of the following is the multiplexing method of SDH?

• A.Flexible mapping
• B.Flexible mapping and asynchronous multiplexing
• C.Asynchronous multiplexing
• D.Flexible mapping and synchronous multiplexing

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The single wavelength incident optical power of a 100G system is lower than that of a 10G system. When
100G channels are expanded In a 10G system, the OA gain can be reduced to decrease the single-wavelength output optical power of the OA to meet the incident optical power requirements.

• A.TRUE
• B.FALSE

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