EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 244)

Analyzing Bidirectional Traces
230 OTDR
Creating Bidirectional Trace Files
Creating Bidirectional Trace Files
To work with the OTDR Bidirectional Analysis utility, you must acquire and
save the traces (in the OTDR application) before opening them with the
Bidirectional Analysis utility.
You can open unidirectional trace files to combine them into a
bidirectional trace. It is possible to use both single-wavelength and
multiwavelength traces. However, once a multiwavelength trace file is
recalled, it is converted to a single-wavelength trace file and you will have
to specify which wavelength the application will use. Bidirectional files will
automatically be created for the other wavelengths. You can save these
bidirectional files or discard them.