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HCSA-Field-Transmission & PTN V1.0 Questions 91–95 (page: 20)

Updated On: 9-Feb-2026

When it is found that the local end reports the ETH_LOS alarm, the fault can be located by the switch-back method. If the alarm disappears after the ODF loops back to the local end, which of the following may be the cause?

  1. The peer board or pigtail is faulty
  2. Line failure
  3. The local board or pigtail is faulty
  4. Device false positives

Answer(s): A



When the device reports the PW_APS_DEGRADED alarm, what is the problem with the LTE service carried by the station?

  1. Business interruption
  2. One of the working protection channels fails
  3. The working protection channel is invalid
  4. None of the working protection channels fail

Answer(s): B



When using the LCAS function, which of the following overhead bytes are used to transmit control information?

  1. M1
  2. H4
  3. K2
  4. K4

Answer(s): B,D



When the data link layer uses Ethernet, the encapsulation format of the data frame includes the destination MAC, source MAC, TYPE, and FCS fields.
When the value of the TYPE field is 0x0806, it indicates that the encapsulated inner packet is which of the following protocols?

  1. IP
  2. IPX
  3. ARP
  4. ICMP

Answer(s): C



When the NE reports the TUNNEL_APS_OUTAGE alarm, what does it mean?

  1. Tunnel protection group is degraded and the availability of the protection group is reduced
  2. The tunnel protection group is interrupted, and the bearer services are interrupted
  3. The tunnel protection group is switched, and the working channel is unavailable
  4. The tunnel protection group is switched and the protection channel is unavailable

Answer(s): B



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