A back channel is a term that applies to asymmetric data connections. It is the slower of the two data paths, or directions, in the connection. Often times, as with ADSL and 56Kbps modems, the back channel is transmitted over the same set of wires or other media as the larger of the two data paths. In other cases, such as with satellite downlinks and some cable modem systems that use a modem and the telephone system to carry the back channel, the data is returned via a different transmission media.
an alternative to the regular channels of communication that is used when agreements must be made secretly (especially in diplomacy or government); "they negotiated via a back channel"
Relates to satellite broadcasting where a separate line, usually dialup, is provided to facilitate outgoing communications.
A means of communication from users to content providers. Today, a simple type of back channel is an Internet connection using a modem.
To enable interactive and Pay-TV services, a direct communication channel between the broadcaster or service provider and the consumer is needed. Normally this "Back" or "Return channel" is realised via the normal telephone line.
This is the communication channel to the content providers to the users. This is also used to provide the feedback purchase of goods and other services.An example is the internet connection using the modem.
A means of communication from users back to content providers. The back channel can be used to provide feedback from the viewer.
A means of communication from users to content providers. Examples include a connection between the central office and the end user, an Internet connection using a modem, or systems where content providers transmit interactive television (analog or digital) to users while users can connect through a back channel to a web site, for example.