NO.16 The wave division system complement to chromatic dispersion mainly adopts the DCM compensation method. The following statements about DCM dispersion compensation, which is wrong?

• A. Improper configuration of the DCM will result in degradation of the system signal-to-noise ratio.
• B. 10G system with line fiber length less than 400km, G.652 DCI can be used to compensate G.655LEAF.
• C. The DCM module is more likely to cause nonlinearity than the line transmission fiber, so it is necessary to strictly control its fiber-optic power.
• D. Improper configuration of the DCM will result in degradation of the receiving end performance.

NO.17 The transmission plane mainly performs functions such as optical signal transmission, multiplexing, configuration protection switching, and reconnection, and ensures the reliability of the transmitted optical signal. However, the exchange action of this layer is carried out under the influence of the management dry surface and the control plane.

• A. TRUE
• B. FALSE

NO.18 Which of the following description of the single station commissioning is wrong?

• A. If the input voltage of the equipment is not within the required range, suggestions for rectification should be proposed.
• B. It is strictly forbidden to plug and unplug the power plug and PIU board.
• C. In case of power failure, the contact board can be used without anti-static wrist or anti-static gloves.
• D. Single station hardware check is complete, make sure all power switches are in the off position

NO.19 Which of the following description of the evolutionist in the mainstream SDN model in the industry is correct? (Multiple Choice)

• A. Control flexibility is moderate and open is not complete
• B. Make full use of existing equipment and achieve fast
• C. Device programmable, open northbound API interface
• D. Try to preserve and reuse existing routing protocols and IP network technologies

NO.20 The E&M signal defines the type of connection between a relay device and a signaling unit. Which of the following belongs to the relay device?

• A. Telecommunications Exchange
• B. PBX
• C. E&M voice exchange
• D. Softswitch platform

NO.21 In the WDM networking design, as long as there are enough EDFA cascades to compensate for the loss of optical power during transmission. Then the system can transmit a long distance without restriction.

• A. TRUE
• B. FALSE

NO.22 For an MSTP device, the service layer path is a path existing on the network management side, and the client layer path is a path existing on the network element side.

• A. TRUE
• B. FALSE

NO.23 Which of the following unified circuit boards can support the intersection of VC, packet and ODUk? (Multiple choice)

• A. U210
• B. HUNQ2
• C. UNQ2
• D. HSNS4

NO.24 MPLS-TP is a subset of MIPLS that removes connectionless IP-based forwarding and adds endto- end OA functionality.

• A. TRUE
• B. FALSE

NO.25 The maximum optical power of light-emitting OBU output is 20dBm, which is used in the Cband 80 system. How much dBm should the single-wave standard output optical power be?

• A. +4dBm
• B. +7dBm
• C. -2dBm
• D. +1dBm

NO.26 The reasons for the discrete business are? (Multiple choice)

• A. The network element side configuration data is not uploaded to the U2000.
• B. The cross-connection configuration on the network element is wrong.
• C. The logical fiber connection of the network element is inconsistent with the physical fiber connection.
• D. There is an outbound subnet service whose source or sink port is not within the scope of network management.

NO.27 An OTN network uses WSMD4 to form a ROADM network element. After the logical fiber is created, the paths that can be directly searched are: (Multiple choice)

• A. OTS
• B. OCh
• C. OMS
• D. Client

NO.28 The following is the client-side logical port of the board in the standard mode.

• A. n(Nn/OUTn)-OCH: 1-ODUk: m-ODUp:a
• B. ClientLP-n
• C. RX/TX-n
• D. ODUkLP-n

NO.29 In the WDM system, after a certain distance of transmission, the optical signal-to-noise ratio of the receiving signal will be reduced to a certain extent. What is the main reason?

• A. Fiber attenuation is too large
• B. Use of the splitter combiner
• C. Use of EDFA
• D. No new fiber is used

NO.30 When creating single station optical crossover, an error message "The direction of the cable is wrong selected" appears. The possible reason is?

• A. The network element management time is not synchronized.
• B. "Create reverse crossover" is not selected during configuration
• C. Device physical fiber connection error
• D. Lack of logic fiber between boards