EXFO FTB-800 Series for FTB-1 - Manual (Page 58)

Test Setup - Test Applications
48 FTB-700G/800 Series
SONET/SDH - DSn/PDH BERT

Path/Mapping
The SONET/SDH - DSn/PDH BERT test application offers the following
path/mapping structures depending on the model and enabled
options.
For SONET: