Free H31-311 Exam Braindumps

The receive end performs BIP-8 check for the unscrambled STM-16 frame. If the BIP-8 check result XOR the value of the B1 byte contained in the following STM-16 frame is 10001100, it indicates that () bit error blocks exist in the STM- 16 frame.

  1. 5
  2. 3
  3. 6
  4. Unclear

Answer(s): B



Which of the following clock working modes support the ITU-T G.781 standard? (Multiple Choice)

  1. Tracing
  2. Holdover
  3. Free-run
  4. Master/Slave

Answer(s): A,B,C



On a Layer 2 switching device, if the Ethernet port is an Access port, the port can receive only the Ethernet frames without VLAN tags or Ethernet frames with the same VLAN ID as the default VLAN ID of the port.

  1. TRUE
  2. FALSE

Answer(s): B



Assume that 2 x VC-12 timeslots need to be bound with VCTRUNK1 of the N2EFS4 board. When 8 x VC-4 timeslots are available on the N2EFS4 board, which of the following timeslots meets the requirements?

  1. VC-12 timeslots 1 and 2 of the first VC-4
  2. VC-12 timeslots 33 and 34 of the second
  3. VC-4 VC-12 timeslots 1 and 2 of the fourth
  4. VC-4 VC-12 timeslots 1 and 2 of the eighth VC-4

Answer(s): C



If the overhead bytes pass through the backplane bus between two slots, the two slots are called paired slots. Paired slots implement automatic transparent transmission of overhead bytes, such as (),(), and (). This improves MSP switching performance and protects DCC communication with other NEs even if the SCC board on the local NE is offline. (Multiple Choice)

  1. K byte
  2. D byte
  3. E1 byte
  4. B1 byte

Answer(s): A,B,C