When to start transmit – CSMA/CD
{"Image DocumentName": "When to start transmit \u2013 CSMA/CD", "Image ImageDescription": "Lecture 4. Lecture 4. When to start transmit \u2013 CSMA/CD. Collision. Animation. Animation. Even with CSMA, two computers may transmit simultaneously. - Both find it idle and begin transmitting in almost a same time. - Two signals exist in medium, interfere each other, call collision. CD (Carrier Detection) - Monitor outgoing signal. - Stop transmissions after collision is detected. - Each waits random time in [0, S] - listen the bus and transmit again if it is idle. - Wait random time in [0, 2S] if collisions is detected again. - Double waiting time range [0, 2kS] when k+1 collisions detected. called exponential backoff, very effective in practical.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}