EXFO FTB-880 - Page 644

Glossary
632 FTB-700G/800 Series
SONET/DSn/SDH/PDH
 [D,C,B,A] for STM-64
 [C,B,A] for STM-16
 [B,A] for STM-4
 [0] for AU-4 in STM-1
 [A] for AU-3 in STM-1
 [A] for the AU-3 in STM-0e, A=0.