A T1 line refers to a specific type of copper or fiber optic telephone line that can carry more data than traditional telephone lines. The T-carrier line, as it is sometimes called, was developed by AT&T Bell Labs for North America and Japan.
Twisted copper telephone lines have been the standard for decades, transmitting voice and data via analog signals. Today that standard is slowly being upgraded to fiber optic lines, (lines made of bundled glass fibers), but most T1 lines are still made of twisted copper. The T1 line creates a "pipe" capable of blowing through larger data streams. Source: http://www.wisegeek.com/what-is-a-t1-line.htm
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