OptiX NG SDH equipment supports -48V and -60V two kinds of power supply. For the N4GSCC single board, the different settings of the power jumper mean the input power is different. Which of the following description is correct? (Multiple choice)

The network must have protection capabilities. Which one is the first condition that needs to be met?

When the OSN 8800 device needs to access GE signals, Which of the following are the boards that can be used? (Multiple choice)

In the non-converged OTU processing OTN standard signal scenario, both A and B are WDM sites, and the client side of the OTU at station A receives the RLOS signal; after processing the alarm at the WDM side of the OTU, it is transmitted to station B The OTU WDM at station B will detect the ODUk PM AIS alarm and generate an SF event; trigger channel service switching. The alarm continues to be sent to the downstream client device of station B, and an ODUK_PM_AIS alarm is reported to the client device.

When ODUk SNCP protection is configured, ordinary WDM services can be converted to SNCP services, but SNCP services cannot be converted to ordinary WDM services.