Ethernet Most widely used lan protocol Bus or star topolos Traditional ethernet 10 Mbps Carrier Sense Multiple Access with Collision Detection(CSMA/CD) Minimum frame length Transmission rate Collision domain(maximum network distance) CSIE NTUT TANAN
CSIE, NTUT, TAIWAN 6 Ethernet • Most widely used LAN protocol • Bus or star topology • Traditional Ethernet – 10 Mbps – Carrier Sense Multiple Access with Collision Detection (CSMA/CD) • Minimum frame length • Transmission rate • Collision domain (maximum network distance)
CSMA/CD A B A's frame Collision Z's frame Collision signal Collision signal Time Time Figure 3-2 CSIE NTUT TANAN
Figure 3 CSIE, NTUT, TAIWAN 7 -2 CSMA/CD
Note Minimum frame length Transmission rate is proportional to Collision domain /Propagation speed CSIE NTUT TANAN
CSIE, NTUT, TAIWAN 8 Minimum frame length/Transmission rate is proportional to Collision domain / Propagation speed
Ethernet Data Link Layer Logical link control (LlC) Flow control Error control Media access control(MAC) operation of the CSMA/CD access method CSIE NTUT TANAN
CSIE, NTUT, TAIWAN 9 Ethernet Data Link Layer • Logical link control (LLC) – Flow control – Error control • Media access control (MAC) operation of the CSMA/CD access method
Ethernet Layers OSI Model Ethernet Logical link Control LLC) Data link layer Media access Control (MAC) Physical layer Physical layer T ransmission medium CSIE NTUT TANAN Figure 3-3
CSIE, NTUT, TAIWAN 10 Figure 3-3 Ethernet Layers