Which of the following statements about ODUk_PM_BDI is correct?

• A.O0UkpM follows the defect indication
• B.OD0kPM parallel connection indication
• C.ODUk PM part BIP8 bit error threshold crossover
• D.ODUk PM signal degradation

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Array waveguide grating (AWG) multiplexer/multiplexer has the following advantages: short wavelength spacing, large number of channels and flat passband. Suitable for DWDM systems in ultra-high speed, large tubes.

• A.True
• B.Error

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Which of the following is the functional unit that provides a high-speed signal interface and processes the corresponding signal?

• A.Line units
• B.Cross-connecting unit
• C.Tributary units
• D.Auxiliary units

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Which overhead below 112 is not ODUk overhead?

• A.Traditional Chinese Medicine
• B.APs/PCc
• C.NJO
• D.PM

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The following is the frame structure of the STM-16?

• A.9*270*1
• B.9*270*64
• C.9*270"4
• D.9*270*16

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