T1

   A long-distance, point-to-point circuit, providing 24 channels of 64Kbps, giving a total bandwidth of 1.544Mbps.

   The standard T1 frame is 193 bits long, made up of twenty-four 8-bit voice samples and one synchronization bit. It transmits 8000 frames per second. When a T1 service is made available in single 64Kbps increments, it is known as fractional T1. In Europe, the comparable circuit is known as E-1, and it has a speed of 2.054Mbps. T1 has been superseded by the CCITT DS-1 designation.

   See also fractional T1; T-carrier.