In the daily deployment and maintenance, engineers and customers often use the MON interface to measure and query the optical power. Here is a summary of the optical power split ratio at the MON interfaces of the original boards and the new OTN boards.
The ratio of the optical power at the MON interface to that at the IN interface
The ratio of the optical power at the MON interface to that at the OUT interface
RMU9 MONI/EXPI=3/97(15DB) MONO/TOA=3/97(15DB)
WSD9 MONI/IN=3/97(15DB) MONO/EXPO=3/97(15DB)
WSM9 MONI/EXPI=3/97(15DB) MONO/OUT=3/97(15DB)
WSMD4 MONI/IN=3/97(15DB) MONO/OUT=3/97(15DB)