Network Communications Chapter 8 Ethernet and IEEE 802

Network Communications Chapter 8 Ethernet and IEEE 802. 3 Networking Technology

Ethernet (Virtual) Bus Topology Figure 8. 1

Ethernet Reference Model Figure 8. 2

CMSA/CD Flowchart Station ready to send Sense the channel Channel busy Wait According Back off Algorithm Channel is not Busy Transmit Data and Sense Channel for Collision No Collision Transmission Completed Figure 8. 3 Transmit Jam Signals

IEEE 802. 3 MAC and LLC Frame Formats Figure 8. 4

Physical Address (MAC) Format Burned into NIC ROM DA 47 DA 46 DA 45…. . . DA 2 4 Manufacturer ID DA 47 – Multicast DA 46 – Universal Administrator DA 45 - DA 24 – Manufacturer ID DA 23 - DA 0 – Product Instance Figure 8. 5: DA 23…. . . …………. . DA 0

Ethernet Characteristics Data Rate 10 Mbits/sec Encoding Slot Time or Propagation Delay Interframe Gap Backoff Limit Jam Size Maximum Size Minimum Frame Size Manchester 512 bit times 9. 6 msec 10 32 bits 1512 bytes 64 bytes

Network Interface Card (NIC) *BNC British Naval Connector *RJ-45 Register Jack Figure 8. 6

Thin. Net Components Figure 8. 7

Thick. Net (10 Base 5) Figure 8. 8

Thick. Net Transceiver Figure 8. 9

Transceiver Architecture Receive Data SQE Collision Detection Signal Quality Error Collision Detection Signal Coaxial cable Jabber Control Figure 8: 10 Transmit Data

10 Base. T RD TD Figure 8. 11