Which of the following is the basic requirement of a DWDM system on a light source?

• A.The transmit power is high.
• B.The direct modulation method is used.
• C.The dispersion tolerance is low.
• D.The output wavelength is stable.

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Configuring an EPLAN service as a ring is not recommended. If the EPLAN service is configured as a ring, the STP protocol must be enabled on the network to prevent broadcast storms.

• A.FALSE
• B.TRUE

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In the SDH optical synchronous transmission system, which of the following bytes is used to transmit the quality and usage information of clock sources?

• A.S1
• B.N1
• C.G1
• D.M1

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Which of the following is the functional unit that provides the interfaces related to the orderwire phone and serial data for the system?

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

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The Erbium Doped Fiber Amplifier (EDFA) is a key component of the new-generation optical communication system. Which of the following are the features of the EDFA? (Multiple Choice)

• A.Amplification of any wavelengths
• B.High gain
• C.High output power
• D.Low noise index

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