Medium
EST. TIME: 45 minCSMA/CD Protocol Study
To create a scenario and study the performance of CSMA/CD (Carrier Sense Multiple Access with Collision Detection) protocol through simulation.
Theory
CSMA/CD is a media access control method used most notably in early Ethernet technology for local area networking.
- Carrier Sense: A node listens to the channel before transmitting.
- Multiple Access: Multiple nodes share the same physical medium.
- Collision Detection: If two nodes transmit simultaneously, a collision occurs. Nodes detect this by monitoring signal voltage levels.
Backoff Algorithm:
After a collision, nodes wait for a random amount of time before retransmitting. The Binary Exponential Backoff algorithm is used to determine this wait time, reducing the probability of another collision.
Procedure
- Enter the CSMA/CD simulation workbench.
- Configure the number of nodes, packet size, and transmission probability.
- Start the simulation and observe how nodes sense the carrier.
- Watch for collisions when multiple nodes transmit simultaneously.
- Observe the jamming signal and the backoff timers.
- Analyze the throughput and collision statistics in the results section.