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Unformatted text preview: The generator polynomial is x 3 + 1. Show the actual bit string transmitted. Suppose the third bit from the left is inverted during the transmission. Show that this error can be detected at the receivers end. Problem 3 In most networks, transmission errors are handled by requesting the damaged packets to be retransmitted. If the probability of a packet being damaged is p , what is the mean number of transmissions required to send a packet if acknowledgments are never lost? Problem 4 Two Ethernet CSMA/CD stations are trying to transmit a few long video les. After each frame is sent, they contend for the channel using the binary exponential backo algorithm. What is the probability that the contention ends on round k, and what is the mean number of rounds per contention period? Please calculate Frst few terms to get the approximated answer....
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This document was uploaded on 02/15/2012.
 Spring '09

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