T1/E1 are digital carrier systems used for transmitting data and voice signals over telephone lines. T1 (used primarily in North America and Japan) transmits data at 1.544 Mbps, while E1 (used in Europe and other parts of the world) transmits at 2.048 Mbps. They are commonly used to provide dedicated bandwidth for leased lines, connecting PBXs (Private Branch Exchanges), and for high-speed internet access for businesses.
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