Digital Signal 0 (
DS0) is a basic
digital signaling rate of 64 kilobits per second (
kbit/s), corresponding to the capacity of one analog
voice-frequency-equivalent
channel. The
DS0 rate, and its equivalents
E0 and
T0, form the basis for the digital multiplex
transmission hierarchy in telecommunications systems used in North America, Europe, Japan, and the rest of the world, for both the early
plesiochronous systems such as
T-carrier and for modern synchronous systems such as
SDH/
SONET.