In T-carrier, a basic digital signaling rate of 64 kb/s, corresponding to the capacity of one voice channel. DS0 forms the basis for the North American digital multiplex transmission hierarchy. It 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 channel.