QUESTION 41
Which of the following statements about querying the optical power of a board is incorrect?

A. The output optical power of the OTU board must meet the board specification requirements. If the output optical power is unqualified, replace the board.
B. The input optical power of the OTU board must be lower than the overload point. Otherwise, the service performance may be affected.
C. The transmit and receive optical power of an OTU board can be measured using an optical power meter or queried on the Web LCT or NCE.
D. The actual single-wavelength output optical power can be calculated based on the multiplexed-wavelength output optical power of the OA.

Correct Answer: D
QUESTION 42
When the client-side port of an OTN tributary board receives GE services, the port working mode must be set to “ODU2 non-convergence mode (OTU2/Any->ODU2)”.

A. TRUE
B. FALSE

Correct Answer: B
QUESTION 43
The following figure shows a WDM network. Which of the following statements about OSC commissioning is correct?

A. The formula for calculating the loss of a fiber line between site A and site B is as follows: optical power at point a – optical power at point d
B. If the receive optical power of the OSC at site B is excessively high, you are advised to add an FOA at point d.
C. The loss of the Flu board should meet the following requirements: optical power at point c- optical power at point 1 dB; and optical power at point c- optical power at point 1dB
D. The transmit optical power of the OSC at site A is usually measured at point b.

Correct Answer: C
QUESTION 44
Which of the following statements about master-slave subrack management is incorrect?

A. The master subrack ID is 0 by default, and the slave subrack ID cannot be set to 0.
B. The IDs of the master and slave subracks must be correctly set to prevent subrack ID conflicts, or communications will be impacted.
C. Only the master subrack needs to be allocated an NE ID and Ip address. If the master subrack fails, it can be connected to the NMS through a slave subrack.
D. In master-slave subrack management, multiple subracks are displayed as one NE on the NMS.

Correct Answer: C
QUESTION 45
Which of the following statements about cleaning fiber connectors is incorrect?

A. You can use a fiber cleaning pen to clean fiber connectors.
B. You can use the same cleaning surface of a fiber cassette cleaner or fiber cleaning wipe to clean an optical fiber for multiple times.
C. Dust and dirt may be introduced during fiber cleaning. Clean the optical fiber if only if the surface of the optical fiber is unqualified.
D. Before cleaning a fiber connector, you can use a fiberscope or magnifier to check the fiber connector and determine the degree of fiber damage or contamination.

Correct Answer: B
QUESTION 46
Which of the following statements about optical module replacement are correct?

A. Before removing an optical fiber from an optical module, you must check whether labels on the optical fiber are clear and correct.
B. Before connecting a pluggable optical module to an optical fiber, you need to measure the input optical power to ensure that the input optical power is within the normal range.
C. Before replacing an optical module, you need to check whether protection is configured for services on this optical port. If protection is configured, you need to perform protection switching and then replace the optical module of the working channel.
D. After wavelength-tunable optical module is replaced, you need to reconfigure the wavelength information of corresponding optical port on the NMS.

Correct Answer: ACD

QUESTION 47
An optical power meter is commonly used in routine maintenance. It can be used to directly test the optical power of each single wavelength in the multiplexed-wavelength signals.

A. TRUE
B. FALSE

Correct Answer: B
QUESTION 48
Which of the following statements about the tools and operations required for replacing boards are correct?

A. You must put the replaced board into a shielding bag or an ESD bag.
B. Before and after board replacement, you can use NCE to query alarms, upload and download data, and perform protection switching on NE boards.
C. When replacing board, you must wear an ESD wrist strap or ESD gloves to prevent electrostatic-sensitive devices from being damaged by the ESD.
D. When replacing a system control board, you can use the Web LCT to perform operations such as changing the NE ID and creating an NE user.

Correct Answer: ABC
QUESTION 49
Which of the following statements about device maintenance precautions are correct?

A. When using an optical time domain reflectometer (OTDR), you need to disconnect fibers connected to the related optical line port at the peer site.
B. To prevent dust from entering the optical interfaces, cover the unused optical connectors with dust-proof caps.
C. The optical modules on boards in different slots may be different. Therefore, do not replace or exchange optical modules without permission during onsite maintenance.
D. When a hardware loopback is configured on an optical port, an optical attenuator needs to be added to prevent the receive optical power from being too high.

Correct Answer: ABCD
QUESTION 50
Before replacing a board, check whether the board type and hardware version of the spare board are consistent with those of the board to be replaced.

A. TRUE
B. FALSE

Correct Answer: A
QUESTION 51
The following figure shows the network of an optical transmission line. What is the planned receive optical power of site B?

A. -12 dBm
B. -10 dBm
C. -13 dBm
D. -9.5 dBm

Correct Answer: B
QUESTION 52
Which of the following statements about optical power units is incorrect?

A. 0 dBm is equal to 1 mw.
B. 3 dBm is equal to 3 mw.
C. 10 dBm is equal to 10 mw.
D. 1 mW is equal to 0.001 W.

Correct Answer: B
QUESTION 53
The optical cable shown in the following figure is a slotted core optical cable.

A. TRUE
B. FALSE

Correct Answer: B
QUESTION 54
If the signal power is reduced by half, the optical power will be reduced by dB.
Correct Answer: 3
QUESTION 55
Which of the following are optical cable types classified by structure?

A. Underwater optical cables
B. Central tube optical cable
C. Stranded loose tube optical cables
D. Slotted core optical cables

Correct Answer: BCD
QUESTION 56
As shown in the following figure, a single-mode optical fiber is usually orange and marked DM.

A. TRUE
B. FALSE

Correct Answer: B
QUESTION 57
Which of the following are the spectrum ranges used by DWDM?

A. O/E/S/C/L band (186.09 THz to 235.87 THz)
B. Extended C band (191.3 THz to 196.05 THz)
C. Super C band (190.7 THz to 196.65 THz)
D. C band (192.1 THz to 196.05 THz)

Correct Answer: BCD
QUESTION 58
Huawei optical transmission network devices can provide ultra-high-bandwidth data center interconnection and real-time backup to improve service continuity.

A. TRUE
B. FALSE

Correct Answer: A
QUESTION 59
Compared with traditional WDM technologies, OTN adopts an integrated optical/electrical architecture and provides flexible networking modes.

A. TRUE
B. FALSE

Correct Answer: A
QUESTION 60
The APS protocol information is transmitted through the                 and K2 bytes in the multiplex section overhead (MSOH).

Correct Answer: K1