LAN: Ethernet-4
CSMA/CD (also known as 802.3)
- first, listen to the cable
- if somebody is speaking, wait
- otherwise, try to speak
- if, due to propagation delay in the cables, two station speaks together, this is a collision
- the first station detecting the collision jam the signal on the cable
- after the collision detection, each station waits for a random time and retries
- if collision occurs again, waits for a bigger time