Huawei H31-331 Exam (page: 4)
Huawei Certified Network Professional-Building Carrier OTN Transmission Network
Updated on: 15-Feb-2026

Viewing Page 4 of 37

Which of the following statements about the safe use of fiber is correct? (multiple choice)

  1. When installing and maintaining the optical interface board and optical fiber, do not look into the optical interface or fiber connector.
  2. When loopback testing the optical port with pigtails, in order to prevent the laser beam from being too powerful to damage the device, it is necessary to add a fixed optical attenuator.
  3. The recommended dust cap is made of soft rubber material. It is not easy to absorb dust and debris, easy to clean, and has good dustproof effect.
  4. For a board that can be equipped with an optical attenuator, it is recommended to add an optical attenuator to the receiving optical port.
  5. Before using the optical adapter dedicated magnifier, the optical fiber should be inspected with an optical power meter to ensure that there is no laser beam in the fiber.

Answer(s): A,B,D,E



If a port has been added with a fiber connection between the boards in the NE, the port automatically becomes the boundary port of the NE.

  1. True
  2. False

Answer(s): B



What are the possible reasons why optical line protection cannot be automatically switched? (multiple choice)

  1. The protection group parameters are incorrectly configured.
  2. Artificially implemented a lock switch or forced switch command.
  3. The working channel has failed.
  4. The protection channel has failed.

Answer(s): A,B,D



Which of the following is the definition of "current alarm" on the network management?

  1. Unfinished or unacknowledged alarms
  2. Unfinished and confirmed alarms
  3. Ended unconfirmed alarm
  4. Unconfirmed alarm

Answer(s): A



Which of the following is a description of the normative layout of cables? Which one is wrong?

  1. The bending radius of the fiber placement should not be less than 40mm
  2. The distance between the power cable, ground wire and signal cable outside the cabinet is more than 30mm.
  3. Try to use a large bending radius (radius greater than 60mm) when turning the cable, and do not tie the cable at the corner.
  4. The -48V power cable is equipped with a black cable, the power ground wire is a blue cable, and the PGND protection ground wire is a yellow-green or yellow cable.

Answer(s): D



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