• Developed at Xerox PARC in 1973.
• It's a standard for Media Access Control (MAC) sublayer.
• Data transmission rate : 10 Mbits/s (Fast Ethernet reaches 100 Mbit/s)
• High-speed driver on the computers connected by coax or UTP cables.
• Uses a bus (10base2, coax, max. distance 200 mt.) or a star (10baseT, UTP, max. 100 mt.) topology.
• Can be optical fibres based too (10baseF , max. 2000 mt.).
• How it works?
  • All nodes wanting to send message contention for the bus.
  • Broadcast frames to all stations on the network.
  • All stations are continually listening to the bus looking for frames addressed to them.
  • Variable length frames : 64 to 1518 bytes.
  • Transmission time : 50 - 1200 microsec.

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