EXFO FTB-800 Series for FTB-1 - Manual (Page 458)

Test Functions
448 FTB-700G/800 Series
Pointer Adjustment

T1 (s) represents the interval between two pointer events.
Example of Single pointer of opposite polarity sequence.

T2 (s) represents the interval between successions of pointer
events.
Example of Regular pointers with one missing pointer
sequence.

T3 (ms) represents the interval between back to back pointer
events.
Example of Regular pointers plus one double pointer sequence.