T1 and T3 are telephone company terms for very fast connections. A T1 line can carry 1.544 Mbps; a T3 line carries 43 Mbps. These types of connections are usually too expensive for individuals and small companies. However, they provide reliable connections for medium-sized and large companies. Very large companies may even need multiple T3 lines.
T1 and T3 lines (and the similar E1 and E3 lines in Europe) are always on and present the same security challenges as a DSL line. In addition, although DSL connections are often utilized by a single home computer, T1 and T3 lines are almost always used by an entire corporate network to which multiple computers are connect.
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