EXFO iOLM - Manual (Page 37)

Setting User Preferences
intelligent Optical Link Mapper 31
Customizing the File Name
5. If you have the loopback (LB) software option, under Loopback
properties, select Append “From/To” to append the direction to the
name of the file.
Based on the items you have selected, a preview of the file name is
displayed under Preview. The components are separated with an “_”
(underscore).
Note: If you do not select any file component, the Save As window appears even
when you tap Save.