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HCSA-Field-Transmission & PTN V1.0 Questions 171–175 (page: 36)

Updated On: 9-Feb-2026

Which of the following are the possible causes of PW failures in the network?

  1. When using LDP to create a PW, if the LDP session fails, the PW creation fails
  2. Physical link failure
  3. The Tunnel that hosts the PW itself has a communication problem
  4. When a PW is created in static mode, the IS-IS exchange route fails, resulting in unsuccessful PW creation

Answer(s): A,B,C



Which of the following Ethernet port alarms is not a physical layer alarm, that is, LSR_NO_HTED has no correlation with it, and there is no suppression relationship?

  1. ETH_LOS
  2. LASER_MOD_ERR
  3. LASER SHUT
  4. ETHJJNK_DOWN

Answer(s): D



Which of the following options is not the cause of the R-LOF alarm?

  1. The received signal is attenuated too much
  2. The signal sent by the peer station has no frame structure
  3. The receiving direction of the board is faulty
  4. Broken fiber

Answer(s): D



Now NE1 and NE2 form a chain network, and E1 service is configured between NE1 and NE2. One day, the fiber from NE1 to NE2 is interrupted (each segment of the reverse fiber).
Which of the following alarms will NE2 report?

  1. MS_RDI
  2. HP_LOM
  3. AU_AIS
  4. LP_RDI

Answer(s): A



The signal-to-noise ratio is an important factor that limits the DWDM system, and the source of the noise is which of the following single boards are widely used in the system?

  1. Optical Transponder Board
  2. Combine/demultiplex board
  3. Raman magnifying board
  4. EDFA slab

Answer(s): D



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