In WDM transmission systems, the main factors affecting the unevenness of power balance of each channel which are not included? (Multiple choice)

• A.The main channel dimming fader setting is unreasonable
• B.Non-uniformity of insertion loss of each channel of the multiplexer/demultiplexer
• C.EDFA gain unevenness
• D.Cable aging is high

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VPLS (Virtual Private LAN Service) is a Layer 2 VP technology that simulates a local area network.

• A.TRUE
• B.FALSE

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Customer Example 1+1 protect when using different routes, the same wavelength cannot be used for the working wavelength and the guard wavelength.

• A.FALSE
• B.TRUE

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Which of the following monitoring boards do not support 1588v2 signal processing and transparent transmission?

• A.ST2
• B.AST2
• C.SCI
• D.SC2

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Which of the following description of ODUflex are correct? (Multiple choice)

• A.ODUflex refers to non-fixed bandwidth ODUk technology
• B.Services supported by ODUflex range from 1.25 Gbit/s to 10 Gbit/s
• C.The advantage of ODUflex is that users can flexibly configure the capacity of the container according to the size of the service to achieve the most efficient use of railway bandwidth.
• D.ODUflex bandwidth of per TS subslot is 1.25 Gbit/s

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