Also spelled T1. A digital transmission link with a capacity of 1.544 Mbps (1,544,000 bits per second). T-1 uses two pairs of normal twisted wires, the same as you'd find in your house. T-1 normally can handle 24 voice conversations, each one digitized at 64 Kbps. T-1 is a standard for digital transmission in North America. It is usually provided by the phone company and used for connecting networks across remote distances. Bridges and routers are used to connect LANs over T-1 networks. In Europe a similar but incompatible service is called E-1 or E1. See A & B Bits for details of signaling.