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Line 49: {{Main \| Go-Back-N ARQ}} An automatic repeat request (ARQ) algorithm, used for error correction, in which a negative acknowledgement (~~NAK~~NACK) causes retransmission of the word in error as well as the next N–1 words. The value of N is usually chosen such that the time taken to transmit the N words is less than the round trip delay from transmitter to receiver and back again. Therefore, a buffer is not needed at the receiver. The normalized propagation delay (a) = {{frac\|propagation time (Tp)\|transmission time (Tt)}}, where Tp = length (L) over propagation velocity (V) and Tt = bitrate (r) over framerate (F). So that a ={{frac\|LF\|Vr}}.

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