The following description of the ASDN software structure, the correct ones are: (Multiple Choice)

SF is a signal failure event and SD is a signal degradation event. Both the SF and SD events are conditions for triggering protection switching, but whether the SD time is used as a trigger switching condition can be set by the user.

Which of the following meters/boards can be used to test the OSR metrics for 10G systems? (Multiple Choice)

When you delete a discrete service, you can first activate it. At this time, you can view the alarm. If there is no alarm such as PS or TU-AIS, it is a garbage service. If there is an alarm, the analysis is incorrect. You need to activate it immediately.

In general, which of the following operations will cause a short interruption in monitoring of existing network devices? (Multiple Choice)