Digital Signal, Level 1: The North American Digital Hierarchy signaling standard for transmission at 1.544 Mbps. This standard supports 24 simultaneous DS-0 signals. The term is often used interchangeably with T1 carrier although DS-1 signals may be exchanged over other transmission systems.
DS-1
Meaning of DS-1 in English
ATM Forum English vocabulary. Английский словарь организации Форум ATM. 2012