A T1 line is an Internet connection providing high-speed T1 bandwidth of 1.544Mbps delivered over fiber optic or copper phone lines. T1 lines are used by businesses to provide reliable, dedicated T1 service for internet access as well as other applications including email, file sharing, web hosting, data backup, video, or VPN access. A T1 line is superior to cable or DSL Internet access because it offers a Service Level Agreement with guarantees on T1 speed, performance, uptime, and repair. This type of dedicated connection can also be configured by a T1 provider to carry voice services (Integrated T1) or for service higher than T1 bandwidth (Bonded T1). T1 lines are also known as an Internet T1, Data T1, DS1 Line, T1 Circuit, Bonded T1, or T1 Leased Line.