In T-carrier, a basic digital signaling rate of 64 kb/s, corresponding to the capacity of one voice-frequency-equivalent channel. Note 1: The DS0 rate forms the basis for the North American digital multiplex transmission hierarchy. Note 2: The DS0 rate may support twenty 2. 4-kb/s channels, or ten 4. 8-kb/s channels, or five 9. 67-kb/s channels, or one 56-kb/s channel, or one 64-kb/s clear channel.