Free Access Huawei.H31-311_V2.5.v2026-06-11.q157 Practice Test (Page 30)

Question 141

Which of the following are correct regarding optical amplifiers and regenerators? (Multiple choice)

A.The regenerator works at a specific bit rate and a specific frame format

B.Optical amplifiers are rarely used, while regenerators are widely used

C.The amplifier can work in any bit rate and frame format

D.The cost of regenerator is high

Question 142

There are many types of optical wavelength division multiplexers. Which ones are listed below?
(Multiple choice)

A.Filter Type

B.Arrayed waveguide optical array

C.Interference filter type

D.Grating type

Question 143

The segment overhead of STM-4 is 9*9*4 bytes/frame.

A.FALSE

B.TRUE

Question 144

Which of the following are communication quality alerts? (Multiple choice)

A.Loss of optical signal

B.No user logged in to the network element

C.Optical port loopback

D.NE Communications

Question 145

The essence of OPSK modulation is to select four possible values on the phase of the optical field so as to reduce the baud rate of the optical signal by half without reducing the line rate. This multiplexing method can reduce the spectral bandwidth of the optical signal by half, making multi-wavelength ULH transmission with 50GH interval and 40G line rate possible.

A.True

B.False

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Question 141

Question 142

Question 143

Question 144

Question 145

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