国家重点实验室 LAN工作原理(总线) ●● ●●● ●●●● A B Printer D E G H File Server So, What Happens when two data TRansmissions are sent at the same Time? 2021/2/11 State Key Lab on ISN, Xidian University
2021/2/11 State Key Lab. on ISN,Xidian University 29 So, What Happens When Two Data Transmissions Are Sent At The Same Time? A B Printer D E G H J File Server LAN 工作原理（总线）
国家重点实验室 LAN工作原理(总线) ●● ●●● ●●●● A B Printer D E G H File Server So, What Happens when two data TRansmissions are sent at the same Time? 2021/2/11 State Key Lab on ISN, Xidian University
2021/2/11 State Key Lab. on ISN,Xidian University 30 A B Printer D E G H J File Server So, What Happens When Two Data Transmissions Are Sent At The Same Time? LAN 工作原理（总线）
国家重点实验室 LAN工作原理(总线) ●● ●●● ●●●● A B Printer D E Collision G H File Server Bus Topology -Ethernet 2021/2/11 State Key Lab on ISN, Xidian University
2021/2/11 State Key Lab. on ISN,Xidian University 31 Bus Topology - Ethernet Collision A B Printer D E G H J File Server LAN 工作原理（总线）
国家重点实验室 LAN工作原理(总线) ●● ●●● ●●●● A B Printer D E Bhck off-Jamb Signa G H File Server Bus Topology -Ethernet What HappenS, A fterathey Collision?
2021/2/11 State Key Lab. on ISN,Xidian University 32 Bus Topology - Ethernet Back Off – Jamb Signal A B Printer D E G H J File Server What Happens After the Collision? LAN 工作原理（总线）
国家重点实验室 LAN工作原理(总线) ●● ●●● ●●●● Back-off and re-send A B Printer D E Re-send 5 us, G H File Server Bus Topology -Ethernet 2021/2/11 State Key Lab on ISN, Xidian University
2021/2/11 State Key Lab. on ISN,Xidian University 33 Bus Topology - Ethernet Re-send 5 µs. A B Printer D E G H J File Server Back-off and Re-send LAN 工作原理（总线）