Which of the following descriptions about the business boundary label and PW encapsulation mode is wrong?

Which of the following methods are included in the networking and application of NG WDM? (Multiple choice)

According to the conversion formula of milliwatt (mw) and milliwatt decibel (dBm), how much dBm is approximately equal to 500 mm? (1g5=0.7)

STM-N signals are transmitted on the line through scrambling mainly to facilitate the receiving end to extract line timing signals. All bytes in the SDH frame structure will be scrambled.

For the relay-type OUT, all alarms of the SM segment are terminated at the local station and will not be sent downstream (except OTUk LOF inserted downward into ODUk PM_AIS). Other alarms continue to be transmitted downstream and reported on the WDM side of OUT (except R_LOS inserts ODUk_PM_AlS to the downstream station)