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Question 1:

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.

A. 5

B. 3

C. 6

D. Unclear

Correct Answer: B

Question 2:

The EPL service exclusively uses bandwidth on the line, which is highly secure. It is applicable to the private line application of VIP customers.



Correct Answer: A

Question 3:

Which of the following statements about clock sources is incorrect?

A. Internal clock sources have the lowest priority because of their low precision.

B. Generally, tributary clocks are not used as the clock sources of devices.

C. The same SSM protocol is selected for all NEs in a clock protection subnet.

D. If the standard SSM protocol is enabled, you need to set the clock source ID.

Correct Answer: D

Question 4:

Which of the following methods can be used to multiplex lower-order ODUk to higher-order ODUk?

A. Time division multiplexing

B. Wavelength division multiplexing

C. Space division multiplexing

D. Frequency division multiplexing

Correct Answer: A

Question 5:

Which of the following can be the center wavelengths of the pump sources in an EDFA? (Multiple Choice)

A. 980 nm

B. 1510 nm

C. 1480 nm

D. 1310 nm

Correct Answer: AC

Question 6:

Which of the following are communication quality alarms? (Multiple Choice)

A. Optical port loopback

B. No login of an NE user

C. NE communication interruption

D. Loss of optical signals

Correct Answer: CD

Question 7:

LCK insertion has priority over AIS insertion. That is, if a user configures LCK insertion and the conditions of automatic AIS insertion are met, LCK is inserted.



Correct Answer: A

Question 8:

Which of the following is not the advantage of WDM?

A. Ultra-large capacity and transparent data transmission

B. Easy to upgrade and maximizing the protection for existing investments

C. Completely substituting for SDH devices

D. Compatible with all optical switching networks in the future

Correct Answer: C

Question 9:

A MAC address consists of 48 bits and is globally unique. Which of the following is the meaning of the MAC address whose eighth bit is 1?

A. Unicast address

B. Bicast address

C. Multicast address

D. Broadcast address

Correct Answer: C

Question 10:

SES: There are 5% or more than 5% bit error blocks or at least one defect (OCI/AIS/LCKAAE/LTCA1M/PLM) within one second.



Correct Answer: B

Question 11:

Which of the following statements about an MSP ring are correct? (Multiple Choice)

A. The number of nodes on an MSP ring cannot exceed 16.

B. When creating a protection subnet, select SDH NEs only. Do not select REG or WDM NEs.

C. When multiple protection subnets occupy the same port on the same board, you must select “Resource Sharing”.

D. “Assigned by VC4” means that different VC4s are assigned to different protection subnets to achieve MSP only in some channels.

Correct Answer: ABCD

Question 12:

The 1310 nm and 1550 nm transmission windows are low-loss windows. In DWDM systems, only the 1550 nm transmission window is used. Which of the following is the major cause?

A. The working wavelength flatness area of the EDFA is included in this window.

B. The non-linear effect of the 1550 nm wavelength area is small.

C. The 1550 nm wavelength area is applicable to long-haul transmission.

D. None of the above

Correct Answer: A

Question 13:

The pointer is used for alignment and indicates the start position of VC-n in the corresponding AU or TU frame. In this way, the receive end can correctly remove the corresponding VC from the STM-N, and then split the VC and C encapsulation to separate low-rate signals, such as PDH. That is, low-rate tributary signals can be directly dropped from the STM-N signal.



Correct Answer: A

Question 14:

OChr means that the electrical supervisory technology is used.



Correct Answer: A

Question 15:

By default, the B2-EXC alarm is reported when the number of B2 bit errors exceeds the ( ) threshold.

A. 0.000000001

B. 0.00001

C. 0.001

D. 0.01

Correct Answer: C