DATA COMMUNICATION Lecture-42.

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Presentation transcript:

DATA COMMUNICATION Lecture-42

Recap of Lecture 41 Synchronous Protocols Bit-Oriented Protocols HDLC Link Access Protocols (LAPs)

Overview of Lecture 42 Local Area Networks (LANs) Project 802 Protocol Data Unit (PDU) Ethernet

Local Area Networks (LANs) A Local Area Network (LAN) is a data communication system that allows a number of independent devices to communicate directly with each other in a limited geographical area

Local Area Networks (LANs) Four architectures of LANs IEEE standards Ethernet Token Bus Token Ring ANSI standard FDDI

LAN Compared with OSI Model

Project 802 A project started by the Computer Society of the IEEE 802.1: Internetworking standard for LANs (Not yet complete) 802.2(LLC): Non-architecture-specific upper sub layer MAC: A number of modules for different LANs

Project 802

Protocol Data Unit (PDU) PDU: The data unit in the LLC level No flag,no CRC,no station address  Added in the MAC layer

Protocol Data Unit (PDU)

Control Field in PDU

Ethernet Developed by Xerox, and extended by DEC, Intel and Xerox

Access Method: CSMA/CD Multiple Access: Multiple users access to a single line Carrier Sense: A device listens to the line before it transmits Collision Detection: Extremely high voltage indicates a collision

Access Method: CSMA/CD

10BASE5: Thick Ethernet Total length of the bus  2500m  To reduce collisions RG-8 coaxial cable

10 BASE 5: Thick Ethernet

Topology of 10 BASE 5

Transceiver Connection in 10 BASE 5 Transceiver connecting mechanism Tap Often called a vampire tap

Transceiver Connection in 10 BASE 5

Summary Local Area Networks (LANs) Project 802 Protocol Data Unit (PDU) Ethernet

Suggested Reading Section12.1, 12.2 “Data Communications and Networking” 2nd Edition by Behrouz A. Forouzan