A.64kbit/s B.2048kbit/s C.155520kbit/s D.2Mbit/s
A.2Mbit/s及155Mbit/s B.2Mbit/s及622Mbit/s C.155Mbit/s及622Mbit/s D.2Mbit/s及139264Kbit/s
A.STM-1 B.STM-4 C.STM-16 D.STM-64