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【正文】 IEEE , this value is defined to be us. NCU MWNL CSMA/CD6 CSMA/CD Collision Handling ? Collision Signal is generated by Physical layer. ? Jam signal (collision enforcement): To make sure that all stations involved in the collision will detect collision. A pattern of 32 bits. ? Collision backoff and retransmission method (Truncated Binary Exponential Backoff Algorithm, BEBA): ? n : number of collisions experienced (n = 16) ? k : Min (n,10) Truncation ? r : Random delay time (unit: slot time) between 0 = r 2k ? Slot time = us. ? Disadvantage of BEBA: ? LastinFirstout effect: Stations with no or few collisions will have a better chance to transmit before stations that have waited longer. NCU MWNL CSMA/CD7 IEEE Frame Format Preamble SFD DA SA LEN LLC PAD FCS
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