1 Rate adaption to a 64 kbit/s channel
1.1 Rate adaption of 8, 16 and 32 kbit/s streams
1.2 Rate adaption of streams other than 8, 16 and 32 kbit/s
2
Multiplexing into a 64 kbit/s channel
2.1 Time division multiplexing of 8, 16 and 32 kbit/s
2.1.1 Fixed format multiplexing
2.1.2 Flexible format multiplexing
2.2 Multiplexing of rates other than 8, 16 and 32 kbit/s