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An example of this is in ADSL where "A" stands for "asymmetric", and the channel from the subscriber to the supplier ( ISP ), is slower and may be of less capacity than the channel from the supplier to the subscriber. For Interactive Service s and Internet Access , the return path is used to establish a Two-way communication Link back to the Service Provider . The back channel may not utilise the same medium as the main channel. For example interactive cable-TV services utilise a Dial-up Modem and telephone line to provide a back-channel. In many cases, the back-channel is used for Acknowlegement s of the validity of the forward-channel's data (i.e. that the forward-channel's data passes validity tests of some sort). SEE ALSO |
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