A T3 line is a super high-speed connection capable of transmitting data at a rate of 45 million bps (bits per second). A T3 line represents a bandwidth equal to about 672 regular voice-grade telephone lines, which is wide enough to transmit full-motion, real-time video, and very large databases over a busy network.
A high-speed Internet connection that typically connects directly to an Internet backbone. A T3 operates at 45 Megabits per second. Technet currently has two T3 connections.
A connection capable of carrying 45 million bits per second. Commonly used in video conferencing and telecommunications where high bandwidth is needed. A T3 is capable of carrying full-screen, full-motion video.