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Describe any circumstances under which an open-loop protocol eg a Hamming code might be preferable to the feedback-type protocols.?
Wiki User
∙ 15y ago
If the propagation delay is very long, as in the case of a space probe on or near Mars or Venus, forward error correction is indicated. It is also appropriate, in a military situation in which the receiver does not want to disclose his location by transmitting. If the error rate is low enough that an errorcorrecting code is good enough, it may also be simpler. Finally, real-time systems cannot tolerate waiting for retransmissions.
Wiki User
∙ 15y ago
Wiki User
∙ 10y ago- When the data link transfer time is long, hamming allows corrections to be applied as data is received, whereas feedback would be needed to request repeating the data this could result in very long delays in data reception!
- When data is being read from RAM, hamming allows corrections, whereas there might be no good copy of the data in RAM to attempt rereading in response to feedback.
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