Huawei Huawei Certifications H31-311 Questions & Answers

• Question 141:

  Compared with a dense wavelength division multiplexing (DWDM) system, a coarse wavelength division multiplexing (CWDM) system provides a certain number of wavelengths and a transmission distance within ( ) km, which greatly reduces system cost and has strong flexibility.

  A. 50

  B. 100

  C. 200

  D. 20

  Correct Answer: B

• Question 142:

  SES: There are 5% or more than 5% bit error blocks or at least one defect (OCI/AIS/LCKAAE/LTCA1M/ PLM) within one second.

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 143:

  For 100G (112 Gbit/s) signals, the actual data baud rate is only 28G baud.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 144:

  Which of the following statements about an MSP ring are correct? (Multiple Choice)

  A. The number of nodes on an MSP ring cannot exceed 16.

  B. When creating a protection subnet, select SDH NEs only. Do not select REG or WDM NEs.

  C. When multiple protection subnets occupy the same port on the same board, you must select "Resource Sharing".

  D. "Assigned by VC4" means that different VC4s are assigned to different protection subnets to achieve MSP only in some channels.

  Correct Answer: ABCD

• Question 145:

  For an OSN 3500, which of the following boards provides the centralized backup function for the +3.3 V power supply of each board in the subrack?

  A. PIU

  B. AUX

  C. COA

  D. SCC

  Correct Answer: B

• Question 146:

  TU-AIS is frequently encountered during network maintenance. Which of the following alarms can trigger the TU-AIS alarm? (Multiple Choice)

  A. AU-LOP

  B. R-LOS

  C. HP-TIM

  D. B2-EXC

  Correct Answer: ABCD

• Question 147:

  Which of the following is the function of TCM overheads in ODUk signals?

  A. Channel supervisory overhead

  B. Path trace identifier overhead

  C. Tandem connection monitoring overhead

  D. General communication channel overhead

  Correct Answer: C

• Question 148:

  Outband networking requires higher costs than inband networking, but provides more reliable management channels.

  A. TRUE

  B. FALSE

  Correct Answer: A

• Question 149:

  Which of the following is not the advantage of WDM?

  A. Ultra-large capacity and transparent data transmission

  B. Easy to upgrade and maximizing the protection for existing investments

  C. Completely substituting for SDH devices

  D. Compatible with all optical switching networks in the future

  Correct Answer: C

• Question 150:

  The error correction capability of FEC is measured with the encoding gain. Which of the following statements about the encoding gain is incorrect?

  A. When the BER is constant, the OSNR saved by the correction encoding is called encoding gain.

  B. The error correction capability of FEC increases with the encoding gain.

  C. The encoding gain of the inband FEC is larger than that of the outband FEC.

  D. The encoding gain of AFEC is larger than that of FEC.

  Correct Answer: C