Back Channel  —  (Backchannel, Return Channel, Return Link, Reverse Channel, Back Channel Network Connection, Return Path) – The physical way that the end-user (viewer) is able to send information, requests and/or demands back to the network operator. This can be an integral part of interactive television. A return path (back channel) is a 2-way communications link between the TV viewer (end-user) and the interactive content provider. (This is opposed to the front channel, which is the 1-way communication from the network operator, such a television network, to the TV viewer; something we all experience simply by watching linear TV.)  The return path may be of lower bandwidth than the front channel. The return path can be offered in a growing number of ways including a standard modem and attached telephone line, a cable modem, satellite connection etc.

Network Definition