H31-341_V2.5

H31-341_V2.5 practice questions, page 2 of 3, with answer review and explanations.

Question 6

Which of the following statements about QPSK modulation are false?

  1. In QPSK, one phase represents two bits, which is also equivalent to splitting a data stream into two, reducing the data rate by half.
  2. QPSK assigns two possible phase values in the optical field. This decreases the baud rate of optical signals by half while keeping the line rate unchanged.
  3. ePDM-QPSK is a preferred modulation format for 100G WDM transmission.
  4. QPSK modulation can increase the spectral bandwidth, reduce the OSNR requirement and non-linear effects in optical fibers, and improve the dispersion tolerance and PMD tolerance.

Question 7

The OptiXtrans DC908 chassis can be a DC chassis or an AC chassis.

  1. TRUE
  2. FALSE

Question 8

Which of the following statements about a TNG2WSMD09 board are true? (Choose all that apply.)

  1. It implements optical-layer service grooming for multiple wavelengths.
  2. It is a reconfigurable optical add/drop multiplexing unit.
  3. It is a 9-port wavelength selective multiplexer/demultiplexer board (Super C band).
  4. It supports optical power adjustment and online optical power detection.

Question 9

Which of the following statements about optical multiplexer and demultiplexer boards is false?

  1. TNG2D6001 demultiplexes one multiplexed-wavelength signal into a maximum of 60 even-wavelength optical signals.
  2. TNG2M60V is a 60-channel multiplexer board with VOA (Super C band).
  3. TNG2UM40 is a 40-channel multiplexer board (Super C band).
  4. The UITL board multiplexes and demultiplexes signals with 50 GHz spacing and signals with 100 GHz spacing.

Question 10

WDM systems generally use DCMs to compensate for chromatic dispersion. Which of the following statements about DCM-based dispersion compensation is false?

  1. If the DCM configuration is incorrect, the system OSNR will deteriorate.
  2. Compared with line transmission optical fibers, DCMs are prone to non-linear effects. Therefore, the incident optical power of the DCMs must be controlled.
  3. For a 10G system with a fiber length shorter than 400 km, G.652-specific DCMs can be used to compensate for dispersion in G.655 (Leaf) optical fibers.
  4. If the DCM configuration is false, the receive-end performance will deteriorate.