The IEEE protocols at the Physical Layer

802.3 (CSMA /CD - Ethernet)

• logical bus network
• can transmit at 10 Mbps
• data is transmitted on the wire to every computer but only those meant to receive respond
• CSMA /CD protocol listens and allows transmission when the wire is clear

802.4 (Token Passing)

• bus layout that used token passing
• every computer receives all of the data but only the addressed computers respond
• token determines which computer can send

802.5 (Token Ring)

• logical ring network; physical set up as star network
• transmits at 4 Mbps or 16 Mbps
• token determines which computer can send