One 64kbps portion of telecommunications circuit bandwidth. Term used for an individual channel of a larger bandwidth circuit, such as a T-1 (see entry).
digital service zero (0). 64 Kbps POTS telephone line, encoded using PCM
A 64 kbit/s unit of transmission bandwidth. A worldwide standard speed for digitizing one voice conversation, and more recently, for data transmission. Twenty-four DS0s (24x64 kbit/s) equal one DS1.