The DS0 is the basic rate of 64Kbps used to transmit individual telephone calls; it is the building block of the telco's voice and data structure. Actual available bandwidth depends on the signal-encoding standard used. (Some signal-encoding technologies, for example, allow multiple bits per baud, which can give a higher overall bit rate.)
The DS0 is different from those faster versions in that it doesn't use a framing format. Anything above 56Kbps is usually a fractional or full T1.
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