Online Access Free H31-331 Exam Questions

Which of the following considerations is required before and after replacement?

• A.Confirm that the cable connection is correct.
• B.Query related alarms and performance events through the NMS.
• C.Check the board indicator blinking status.
• D.Check whether the switchover is normal for the function board that has the backup function.

Optical power is an important factor affecting the transmission distance of the system in the WDM system.
Which of the following alarms is not possible when the optical power is abnormal?

• A.ODU_SNCP_PS
• B.OTUk_SSF
• C.POWER_FAIL
• D.TF

The SMA (Electro-absorption Modulation) source SMSR index is generally superior to the direct modulation source.

• A.False
• B.True

Which of the statements about the dispersion compensation module is wrong?

• A.The system retains proper dispersion, which can effectively avoid the occurrence of four-wave mixing
• B.DCM80 indicates that the module can compensate 80KM dispersion value
• C.The inside of the module is DCF (with dispersion inverse characteristic) pigtail
• D.Dispersion compensation is a random value, independent of cable length

What are the reasons for reporting R_LOS alarms on the BTU board? (multiple choice)

• A.The local laser is turned off, resulting in no light signal input.
• B.The local optical port is not used.
• C.Broken fiber or line performance degradation
• D.The local end receives the board failure and the line reception fails.