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Front
Channel - The Front Channel refers to the actual
broadcast from the television network
operator to the TV viewer. This broadcast faces the viewer. It's
one-way in nature. In non-interactive TV systems, the front channel
often is
the only
channel, as the signal or data stream is only going to the
viewer and the viewer has limited ability to interact with the data
they're receiving. But in interactive TV, a back
channel is employed for
the
return flow of data from the end-user (viewer) to the network operator.
 See the Interactive Television
Institute.
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