• noun a leased line connection that transfers data at 1.544Mbps in the US and 2.048 Mbps in the UK and Europe and can carry either data or 24 voice channels. If the link uses only part of this capacity, it is called a fractional T1 link. These links are normally used to connect ISPs together or to connect offices of a large organisation.


  • A digital transmission standard, system, or line with a signaling rate of 1.544 Mbps, which is equivalent to DS1, providing a capacity of 24 voice channels, each with 64 Kbps. Such channels may be combined, and can serve to transmit voice and/or data. T1 is used mostly in the Unites States, Canada, and Japan, and is similar to E1, which is used by most other countries. E1 has a signaling rate of 2.048 Mbps. Also called T-span (2).
  • acronym forT-Span
  • A unit of 24 voice channels, which is the equivalent of a T1 line or circuit.

Media Studies

  • noun a high-capacity telephone line suitable for high-speed digital access to the Internet and able to handle 24 voice or data channels simultaneously