EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 278)

Managing Results
272 FTB-5240S/S-P/BP
Managing WDM Test Results
To view the WDM Investigator diagnostics:
From the main window, select the WDM Investigator tab.
As you change the channel selection in the WDM Investigator tab, the
selected row in the Results tab list will move accordingly to indicate the
corresponding channel analysis results.
The WDM Investigator diagnostics are divided into two types: channel
characteristics (informative) and impairments (qualitative). Both the
channel characteristics and the impairment identification help to pinpoint
the exact failure affecting a channel, which reduce test time and help
prevent future failures.
There are two channel characteristic types:

Pol-Mux signal: This specific kind of channel characteristic determines
if the signal is polarization multiplexed. Pol-Mux signals appear
unpolarized (minimal polarization extinction) at the end of an i-InBand
acquisition.
Note: When a signal is identified as Pol-Mux, no further diagnostics are provided.