T-1

Definition

Trunk Line One. High-speed digital transmission line offering total data-carrying capacity (bandwidth) of 1.544 millions bits per second (Mbps) with 24 individual channels in the US and Japanese (J-1) versions, and 2.048 Mbps with 30 channels in the European (E-1) version. This medium-independent line can use ordinary (unshielded twisted pair) telephone lines, co-axial or fiber-optics cable, or radio (microwave) media. Each of its channels can be configured to carry uncompressed voice or compressed audio, video, or other data traffic, and can be leased separately.