EXFO FastReporter Data Post-Processing Software - Manual (Page 76)

Working with OTDR Files
70 FastReporter
Creating Bidirectional OTDR Files
Creating Bidirectional Measurement Files
You can combine unidirectional measurements into a bidirectional
measurement file. It is possible to use both single-wavelength and
multiwavelength measurements. FastReporter matches the wavelengths.
The A->B and B->A measurement files must respect the following criteria:
To create bidirectional files in FastReporter, you must first match A->B files
with B->A files. For information on file matching, refer to Matching Files on
page 65. Changes made to event matching tolerances will effect
bidirectional event table results.
Item To be valid...
Pulse width Must be identical for both measurement files.
Fiber types Use only measurements acquired using
singlemode fibers.
Wavelengths Must be identical for both measurements.
Measurement file Both must be unidirectional files.