In telecommunication, a digital transmission group is a group of digitized voice or data channels or both with bit streams that are combined into a single digital bit stream for transmission over communications media. Telecommunication is the transmission of signals over a distance for the purpose of communication. ... ==GROUP== CONTENTS : 1. ... Data is the plural of datum. ... This article is about the unit of information. ... A digital system is one that uses discrete numbers, especially binary numbers, or non-numeric symbols such as letters or icons, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an analog system). ... In communications, transmission is the act of transmitting electrical messages (and the associated phenonomena of radiant energy that pass through media). ... In telecommunications, information transfer is the process of moving messages containing user information from a source to a sink. ...

Digital transmission groups usually are categorized by their maximum capacity, not by a specific number of channels. However, the maximum digital transmission group capacity must be equal to or greater than the sum of the individual multiplexer input channel capacities. A multiplexer combines more than one input into a single output. ... The term input has a variety of uses in different fields. ... Channel, in communications (sometimes called communications channel), refers to the medium through which information is transmitted from a sender (or transmitter) to a receiver. ...