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  • Exam Name: Nokia Advanced Optical Network Design
  • Last Update: 02-Mar-2024
  • Questions and Answers: 40
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4A0-255 Questions and Answers

Question # 1

Consider the exhibit that shows a link power budget diagram. Which of the following is represented at location 2?

4A0-255 question answer


Power range


OSNR margin


Minimum attenuation


System aging margin

Question # 2

Which of the following best describes self-phase modulation?


It is a type of modulation format exploiting the phase to carry information.


It is a phase shift suffered by an optical signal caused by its power intensity.


It is s type of impairment that can be compensated usingDCMs


It is a type of impairment cause by spectrally adjacent channels.

Question # 3

Which of the following is recommended to reduce the latency of a 30km long link?


DCM-free amplifiers


Soft-decision FEC


Low-noise amplifiers


L1 encryption

Question # 4

Consider the exhibit showing the schematic for an NE ina deployed optical network. Thetraffic growth forecast is for the use of 40 channels in 3 years. The customer needs to reduce thespace for the shelf. Among the following, which additional input is NOT necessary to meet these specific requirements?

4A0-255 question answer


Rack size


Expected traffic added-dropped at the site


Mean time to repair for the equipment


Power supply

Question # 5

Which of the following is NOT a functionality provided by a coherent receiver?


Analog-to-digital conversion (ADC)


Digital signal processing (DSP)





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