The clock ID can solve the possible timing loop problem. In the following networking, in order to completely solve the clock loop, how many clock IDs need to be set in total?

Which of the following protections need to use the APS protocol? (Multiple choice)

According to the OTU board naming rules, which of the following descriptions about the meaning of each letter in the MD02A board is wrong?

The OptiX NG WDM device only supports the global label control, and the size of the label control is 32768.

Once a nonlinear effect occurs, its impact on service signals cannot be repaired. Therefore, the current network's approach to dealing with nonlinear effects is to avoid the occurrence of nonlinear effects as much as possible.