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NEW QUESTION 68
Forced switching, fiber cut switching, manual switching, and exercise switching are in the descending order of priority.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION 69
The error correction capability of FEC is measured with the encoding gain. Which of the following statements about the encoding gain is incorrect?
- A. The encoding gain of the inband FEC is larger than that of the outband FEC.
- B. The encoding gain of AFEC is larger than that of FEC.
- C. When the BER is constant, the OSNR saved by the correction encoding is called encoding gain.
- D. The error correction capability of FEC increases with the encoding gain.
Answer: A
NEW QUESTION 70
Some of the SNCP protection switching conditions are default, such as AU-AIS and TU-AIS. Others conditions are optional, such as HP-TIM and HP-SLM. The optional conditions can be flexibly set based on service levels.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION 71
Which of the following maintenance signals is transmitted from a downstream site to an upstream site in OTN?
- A. BDI
- B. IAE
- C. LCK
- D. ATS
Answer: A
NEW QUESTION 72
The value of the MFAS byte increases with the sequence number of the OTUk/ODUk base frame, and a maximum of ( ) base frames are included.
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 73
Which of the following statements about the signal label byte C2 is incorrect?
- A. The C2 byte is used to indicate the multiplexing structure of the VC frames and the payload property.
- B. If the C2 byte mismatch is detected, an LP_SLM alarm is reported in the corresponding VC-4 channel.
- C. C2=00H indicates that the VC-4 is unequipped.
- D. The C2 byte to be sent must match the C2 byte to be received.
Answer: B
NEW QUESTION 74
The error correction capability of FEC is measured with the encoding gain. Which of the following statements about the encoding gain is incorrect?
- A. The encoding gain of the inband FEC is larger than that of the outband FE
- B. When the BER is constant, the OSNR saved by the correction encoding is called encoding gain.
- C. The encoding gain of AFEC is larger than that of FE
- D. The error correction capability of FEC increases with the encoding gain.
Answer: A
NEW QUESTION 75
SDH signals must be scrambled before being transmitted over optical fibers. Which of the following bytes are not scrambled? (Multiple Choice)
- A. A2
- B. J0
- C. A1
- D. J1
Answer: A,B,C
NEW QUESTION 76
During the service configuration between two adjacent sites (NE1 and NE2), if VC4:1 and VC12:l-3 are used on the NEl's line board connected to NE2, the same VC4 and VC12 timeslots must be used on the NE2's line board connected to NE1.
- A. TRUE
- B. FALSE
Answer: A
NEW QUESTION 77
On the NMS, the NE performance monitoring time is set to () minutes and () hours,
- A. 30, 12
- B. 15, 12
- C. 30, 24
- D. 15, 24
Answer: D
NEW QUESTION 78
Which of the following operating systems support the installation of the U2000 client?
- A. All of the above
- B. Solaris
- C. Windows
- D. SUSE Linux
Answer: A
NEW QUESTION 79
The difference between a dispersion compensation fiber and a common fiber is that the dispersion compensation fiber has a negative dispersion coefficient at ( ).
- A. 1310 nm
- B. 1650 nm
- C. 800 nm
- D. 1550 nm
Answer: D
NEW QUESTION 80
The rate of STM-1 is () bit/s.
- A. 9*270*4*8000
- B. 9*270*1*8000
- C. 9*270*1*8000*8
- D. 9*270*1*8000*16
Answer: C
NEW QUESTION 81
The TAG attribute cannot be set for the internal port VCTRUNK of the board on the NMS.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION 82
The frame period of OTN signals is fixed, which is the same as that of SDH signals.
- A. TRUE
- B. FALSE
Answer: B
NEW QUESTION 83
The number of bit error blocks on each VC-4 channel is detected by B3 at the receive end. At the same time, the information is sent back to the transmit end through ( ), and HP-REI and HP-FEBBE are reported at the transmit end.
- A. K3 (bl-b4)
- B. G1 (b5-b8)
- C. J (bl-b4)
- D. G1 (bl-b4)
Answer: D
NEW QUESTION 84
EPL services exclusively use ports and bandwidths, and different users may need to share resources. Which of the following methods can be used to isolate user data?
- A. VLANID
- B. All of the above
- C. QinQ technology
- D. MPLS label
Answer: B
NEW QUESTION 85
In the SDH optical synchronous transmission system, which of the following bytes is used to transmit the quality and usage information of clock sources?
- A. G1
- B. M1
- C. N1
- D. S1
Answer: D
NEW QUESTION 86
The section overhead of STM-4 is () bytes/frame.
- A. 9*9*4
- B. 9*8*4
- C. 9*9*8
- D. 9*8
Answer: B
NEW QUESTION 87
When the rate of an SNCP ring consisting of four OptiX OSN 2500 devices is 2.5 Gbit/s, the service capacity of this network can carry a maximum number of ( ) 2 Mbit/s signals.
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION 88
Which of the following are communication quality alarms? (Multiple Choice)
- A. No login of an NE user
- B. Optical port loopback
- C. Loss of optical signals
- D. NE communication interruption
Answer: C,D
NEW QUESTION 89
An unprotected chain consists of four NEs: NE1, NE2, NE3, and NE4. An end-to-end VC4 trail NE1-NE4 is created, and NE5 is added between NE2 and NE3 for capacity expansion. The original configuration remains unchanged, and no service is configured on NE5. In this case, the unprotected chain becomes NE1-NE2-NE5-NE3-NE4, and how many VC4 trails can be searched out?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
NEW QUESTION 90
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