PP Presentation

Go Back N Protocol

• Suppose the transmission time required for a frame to arrive at the receiver plus the transmission time for the ack to come back is non-trivial.
• E.g. a 50 kbps satellite channel could have a 500 ms round trip time. To xmit a 1000 bit frame takes 20 ms, but it is not until 520 ms that the sender gets an ack and so is blocked 500/520 = 96% of the time.

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