In computing, bandwidth is the maximum rate of data transfer across a given path.
A common carrier in common law countries (corresponding to a public carrier in civil law systems,Encyclopædia Britannica CD 2000 "Civil-law public carrier" from "carriage of goods" usually called simply a carrier) is a person or company that transports goods or people for any person or company and that is responsible for any possible loss of the goods during transport.
A communication channel or simply channel refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel in telecommunications and computer networking.
Digital Signal 1 (DS1, sometimes DS-1) is a T-carrier signaling scheme devised by Bell Labs.
A Digital Signal 3 (DS3) is a digital signal level 3 T-carrier.
Interexchange carrier (IXC) is a U.S. legal and regulatory term for a telecommunication company, commonly called a long-distance telephone company.
In telecommunications and computer networks, multiplexing (sometimes contracted to muxing) is a method by which multiple analog or digital signals are combined into one signal over a shared medium.
A telephone exchange is a telecommunications system used in the public switched telephone network or in large enterprises.