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About the Pictures Image Gallery
Digital signal 1 (DS1, also known as T1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs. DS1 is a widely used standard in telecommunications in North America and Japan to transmit voice and data between devices. E1 is used in place of T1 outside of North America, Japan, and South Korea. Technically, DS1 is the logical bit pattern used over a physical T1 line; however, the terms DS1 and T1 are often used interchangeably.
Digital signal 1 Photo List