A T1 line carries 1.544 megabits of information between two points in both directions. Uses for T1 include telephone lines, video transmission and computer interconnections. The use of a particular T1 line depends entirely on the traffic exchanged between the two terminals. T1 lines run over copper cable, microwave radio and fiber-optic cable. Consumers and small businesses lease T1 lines from telephone companies. Large companies build transmission systems that carry multiple T1 lines. To install a T1 line you must first establish end-to-end continuity and know electronic installation procedures for the cable for your particular system. Warnings Writer Bio