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Free 4A0-255 Exam Braindumps (page: 3)

Page 2 of 11
PDF with 40 Questions

What is guardband required for?

  1. To reduce the impact of chromatic dispersion.
  2. To properly use the available bandwidth of the fibers.
  3. To enable each channel to support a higher modulation format.
  4. To reduce non-linear impairments between coherent and non-coherent channels.

Answer(s): D



Which of the following is NOT an advantage of super-channels?

  1. Improved spectral efficiency
  2. Simplified management of the carriers
  3. Narrower spacing between carries of the super-channel
  4. Impairment-free transmission

Answer(s): C



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

  1. Analog-to-digital conversion (ADC)
  2. Digital signal processing (DSP)
  3. Mixing
  4. Demultiplexing

Answer(s): C



Consider a signal at 100G PDM-QSK.
Which of the following statements is true?

  1. It supports more bits per symbol per polarization than 8QAM
  2. It has the same Gbaud rate as 100G 8QAM.
  3. Each symbol supported 2 bits per polarization.
  4. The Gbaud rate is 50.

Answer(s): A






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