EXFO FTB-800 Series for FTB-1 - Manual (Page 248)

Test Setup - Test Configurator, Timer, and System
238 FTB-700G/800 Series
Traces (OTN)

SAPI OTU/ODU/TCM-TIM check box, when selected (cleared by
default), allows editing the expected Source Access Point Identifier
(SAPI) and also enables OTU/ODU/TCM-TIM alarm monitoring.

DAPI OTU/ODU/TCM-TIM check box, when selected (cleared by
default), allows editing the expected Destination Access Point Identifier
(SAPI) and also enables the OTU/ODU/TCM-TIM alarm monitoring.