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Synthesis of a T-Carrier Bit Stream Processing System: An Integrated Transmission and Switching System

T-carrier is a point-to-point digital time division multiplex transmission system. It is designed to transmit voice and signaling information with low distortion between two points. T-carrier systems are not required to interpret dialed numbers or make routing decisions. When these switching functions are required, the previous approach has been to demodulate the multiplexed signals into their original analog form to be compatible with analog switching entities. However, it is desirable to provide such switching functions while avoiding the demodulation process. This paper describes the synthesis of a T-carrier bit stream processing system which provides transmission and switching functions without the need for time division multiplex demodulation. The resulting system meets telephone company transmission and switching needs in rural communities. First operational service began on March 26, 1976.