L14 - There are two different protocol types that have...

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There are two different protocol types, that have different maximum value of W. One type can only accept the next frame in order - the “ go-back ” protocol - if the sender needs to repeat a frame, it must go back and repeat all frames it had sent after that frame. The ambiguity window limit for the “go- back” protocol is: W # 2 - 1. b
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Another class of protocols is called “ selective repeat or selective reject ”. In this protocol, gaps can be left, and ideally the sender can selectively repeat only the frames not already sent successfully. The usually quoted window limit for this protocol is W # 2 . b-1 However, the selective repeat scheme I made up in 1960, called circulating memory, has a different constraint, W # 2 - J, b where J is the maximum number of frames sent out before the acknowledgment of a frame returns. Let’s save the selective repeat strategy for a little later.
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Sliding window for continuous transmission: Go-Back Protocol.
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