Which of the following is the data that needs to be collected and saved in the event of a failure? (Multiple Choice)

Before creating an optical cross-connection, you need to manually configure the corresponding port of the corresponding board as a boundary port, for example, the line-side port of the FIU board between two sites.

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).

The steps that must be performed when configuring the Ethernet private line service carried by the PW are as follows: (Multiple Choice)

The following description of the 1+1 protection in the board, the correct ones are: (Multiple Choice)