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DS1

Digital Signalling Level 1 (DS1) is a North American telecommuncations scheme consiting of 24 voice channels time-division multiplexed (TDM) into 192-bit frames across single physical connection providing 1.544 Mbps data throughput across a T1 Physical Layer digital voice connection.

DS1 is the oldest digital multiplexing system in use in the North American Public Switched Telephone System (PSTN).