Chapter 9 Communications Circuits 9.4.6 T-carrier system T-carrier systems are a family of high speed digital transmission systems. A T-1 circuit can carry data at 1.544 Mbps 9. 4.7 Fractional t-1 p175 www.gxmu.edu.cn9.4.6 T-carrier system T-carrier systems are a family of high￾speed digital transmission systems. A T-1 circuit can carry data at 1.544 Mbps. 9.4.7 Fractional T-1 P175 www.gxmu.edu.cn Chapter 9 Communications Circuits