Ethernet

CONTENTION BUS (ETHERNET)

Contention Bus also known as Ethernet is the most common LAN technology. An Ethernet LAN uses coaxial cable, specified grades of twisted pain wires. Ethernet does not cope well with heavy traffic, but this problem is compensated by the following:

	Ethernet networks are cheap to install and easy to plan
	It is reliable and fairly robust
	It is supported by most hardware and software systems
	It is simple to add and delete computers on the network.

Ethernet uses carrier sense Multiple Access with Collision Detection (CSMA/CD)

	In Ethernet, nodes can transmit at the same time
	When two nodes transmit at the same time collision occurs
	In Ethernet, detection of collision results in jamming signal
	Nodes that are conflicting can wait for a random time before attempting a re-transmission.
	Prioritisation is achieved by reducing the time.

Ethernet (bus) mechanism