A leased-line connection capable of carrying data at 1,544,000 bits-per-second. At maximum theoretical capacity, a T-1 line could move a megabyte in less than 10 seconds. That is still not fast enough for full-screen, full-motion video or voice. T-1 lines are commonly used to connect e LANs to the Internet.
A 1.5 Mbit/sec telephone circuit that carries 24 digital phone calls of 64 kbits each, multiplexed together on a single four-wire circuit. Commonly used to supply telephone service where multiple lines are required at the same location. The Internet has produced another application for these lines, supplying a 1.5 Mbit last mile from Internet Service Provider (ISP) to customer.
Trunk Level 1. A high-speed (1.544 megabits per second) digital telephone line with the equivalent of 24 individual 64Kbps channels, which are joined via time division multiplexing. A T-1 can be used to transmit voice or data, and many are used to provide connections to the Internet. Also known as a DS1 or Digital Signal 1.