NO.76 ODUk SNCP protection cannot be automatically switched. The possible reasons are: (Multiple Choice)

• A. SNCP type setting error
• B. Waiting for the recovery time to be set too long
• C. Electrical cross configuration error
• D. Set the lock or forced switch command

NO.77 In general, which of the following operations will cause a short interruption in monitoring of existing network devices? (Multiple Choice)

• A. Hard reset main control board
• B. Software loopback
• C. Hardware loopback
• D. Soft reset main control board

NO.78 The E-Line service types supported by the MS-OTN packet device are: (Multiple Choice)

• A. E-Line service based on VL.AN
• B. E-Line service based on QinQ
• C. E-Line carried by PW
• D. Point-to-point transparent transmission of E-Line services

NO.79 Which of the following is not included in the OOS overhead?

• A. Optical transmission section overhead
• B. Optical channel overhead
• C. Optical multiplex section overhead
• D. Optical channel transmission unit overhead

NO.80 In a WDM system, after a distance of transmission, the OSNR of the signals at the receive end decreases to a certain extent. Which of the following is the main cause?

• A. Use of Demultiplexer Multiplexer
• B. New optical fiber is not used.
• C. The fiber attenuation is too large.
• D. Use of EDFA

NO.81 What should be paid attention to when configuring extended ECC? (Multiple Choice)

• A. The ECC extension mode of the remote NE must be modified first, and then the ECC extension mode of the gateway NE is modified.
• B. Avoid communication by extended ECC mode between each subnet gateway network element.
• C. When setting the ECC extended mode remotely, you must ensure that the settings are correct in order. Otherwise, the unmanaged network element will not automatically resume communication with the network management system and must be reset to the site.
• D. It is not recommended to set the gateway NE as the server. It is recommended to set the NE closest to the gateway NE as the server NE.

NO.82 After the PWE3 service is successfully deployed, what is the deployment status of the PWE3 service displayed?

• A. Deployment
• B. Activated
• C. Deployed
• D. Activation

NO.83 Which of the following description of the principle of automatic protection switching of the standard SSM protocol are correct? (Multiple choice)

• A. The network element broadcasts the clock quality information of the synchronization source to the downstream site through the S1 byte, and notifies the upstream station that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.
• B. According to the clock source priority table, the network element first selects the clock with the highest quality level from the available clock sources as the homologous source.
• C. If there are multiple clock sources with the highest quality level, the network element selects the clock with the highest clock priority as the synchronization source.
• D. The network element broadcasts the clock quality information and the clock source ID of the synchronization source through the downstream station between the S1 bytes, and notifies the upstream station that the clock quality from the local network element is "not available for synchronization" by the S1 byte in the direction of the synchronization source.

NO.84 The OTN circuit board (such as ND2) of OSN 1800V can respond to the status of the indicator light on the panel to reflect the optical power of the local end too high or too low.

• A. TRUE
• B. FALSE

NO.85 The NG WDM two-dimensional ROADM site can use the WSMD9 single board, and its signal flow is an optical signal that is connected to the main optical channel from the "IN" optical port. The RDU (ROADM Demix Unit) optical module broadcasts nine identical optical signals, which are output from the "DM1~DM8" and "ECPO" optical ports respectively. One of the signals is localized by the splitter board, and the other eight signals are dispatched to the other eight directions. Each wave of the main optical channel is connected from the "EXPI" optical port. The multiplexed or single-wave optical signal that needs to be inserted locally is input through the "AM1"~"AM8" optical port.

• A. TRUE
• B. FALSE

NO.86 The ways of synchronize alarms are (). (Multiple Choice)

• A. Timing synchronization
• B. Automatic synchronization
• C. Manual synchronization

NO.87 For the relay type OTU, the alarms of all SM segments are terminated at the local station and are not transmitted downstream (except for OTUkLOF to insert ODUk_PI_AIS downstream). Other alarms continue to be transmitted to the downstream station and reported on the WDM side of the OTU (except for R_LOS to insert ODUK_PM_AIS to the downstream site).

• A. TRUE
• B. FALSE

NO.88 Which of the following description is wrong about the content of the formula for calculating the maximum line rate (N=Ratc/((L+7+1+M)x8))?

• A. L is in standard Ethernet frame length with a minimum value of 64Bytes
• B. M is the frame gap, and the minimum IFG (minimum frame gap) is 8 bytes.
• C. Rate indicates the line rate of the physical layer. If the device port is FE, then Rate=100Mbit/s.
• D. "8" outside the brackets is 1 Byte containing 8 Bits

NO.89 Which of the following description of the ASON software structure is correct? (Multiple Choice)

• A. Intelligent optical network consists of three planes
• B. Management plane mainly refers to upper management such as network management
• C. Intelligent software main application management plane
• D. The transmission plane refers to the traditional transmission network.

NO.90 The following protection methods belonging to NG WDM optical layer protection are: (Multiple Choice)

• A. Customer side 1+1 protection
• B. Optical line protection
• C. ODUk SNCP protection
• D. 1+1 protection inside the board