Which of the following residual dispersion values are within the dispersion tolerance of the TN52ND2 board?

A. 900ps/nm

B. 500ps/nm

C. 700ps/nm

D. 600ps/nm

Which of the following alarms trigger optical line protection switching?

A. POWER_DIFF_OVER

B. R_LOF

C. MUT_LOS

D. R_LOS

Which of the following statements about the line fiber quality monitoring performance parameters is wrong?

A. The pulse width of emitted optical pulses varies according to monitoring modes, and affects the detection distance and measurement precision. A greater pulse width provides a larger dynamic range, longer detection distance and better measurement precision.

B. When the pulse width increases, the light emitting time increases and consequently a larger energy is obtained. This means that a larger dynamic range can be acquired but also larger dead zones will result.

C. Measurement is performed multiple times within the detection time. The average value is obtained based on the measurement results to improve the measurement precision. The actual duration from the time when a detection event starts to the time when the detection results are returned will be longer than the Detection time.

D. The total fiber loss will affect the detection distance and the dynamic range is fixed for the same detection mode. Therefore, a larger total fiber loss indicates a smaller detection distance.

Which of the following statements about the modulation technologies of the 40Gbit/s and 100Gbit/s coherent systems are correct?

A. The modulation technology used in a 100G coherent system is ePDM-QPSK.

B. The modulation technology used in a 40G coherent system is ePDM-BPSK.

C. The modulation technology used in a 40G coherent system is ePDM-QPSK.

D. The modulation technology used in a 100G coherent system is ePDM-BPSK.

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 EDFA

B. The fiber attenuation is too large.

C. New optical fiber is not used.

D. Use of Demultiplexer Multiplexer

Which of the following methods can be used to analyze faults in the NG WDM system?

A. Loopback

B. Service Signal Flow Analysis

C. RMON

D. Replacement

Which of the following is not a precaution after board replacement?

A. Record the settings of jumpers and DIP switches on the board.

B. /For functional units that have backups, check whether the switchover is normal.

C. Check the indicator blinking status of the board and ensure that the board works properly.

D. Ensure that no abnormal alarm.

Before the optical power commissioning of an ROADM board, you need to configure virtual optical-layer services. Otherwise, the ROADM board blocks all wavelengths by default.

A. True

B. False

Which of the following statements about Flexible ROADM is incorrect?

A. Improves spectrum utilization and meets the requirements for flexible scheduling in the 100 Gbit/s era.

B. Flexible ROADM is compatible with existing networks.

C. The WSMD2 board supports the Flexible ROADM configuration.

D. The Flexible grid technology can flexibly set bandwidth and support flexible bandwidth allocation and scheduling.

Which of the following is the client-side logical port of a board in standard mode?

A. ODUkLP-n

B. RX/TX-n

C. ClientLP-n

D. n(Nn/OUTn)-OCH:l-ODUk:m-ODUp:q