DCN_rpj12

DCN_rpj12 - NT503: Data Communication & Networking LAN...

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1 LAN architecture and protocols - II
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2 ¾ IEEE 802.3 defines a standard for Local Area Networks and Ethernet happens to be the most popular type of Local Area Network. Wireless LAN 802.11 LLC 802.2 IEEE 802 CSMA/CD 802.3 / Ethernet Token bus 802.4 Token ring 802.5
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3 ± Ethernet is the most popular LAN technology today ± IEEE 802.3 deals with three functions, ± Data transmission ± Media access ± Collision handling
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4 802.3 is a standard specification for Ethernet , a method of physical communication in a local area network (LAN), maintained by IEEE. 802.3 specifies the physical media and the working characteristics of Ethernet. Original (or traditional) Ethernet supports a data rate of 10 Mbps and specifies these possible physical media. Baseband implementations 10BASE-2 10BASE-5 10BASE-T 10BASE-F
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5 Traditional Ethernet cable chart Star 2000 10 Fiber-optic cable 10BASE-F Star 100 10 UTP cable 10BASE-T Bus 500 10 Thick co-axial cable 10BASE-5 Bus 185 10 Thin co-axial cable 10BASE-2 Topology Max. segment length (m) Data rate (Mbps) medium Cable type
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6 IEEE 802.3 frame format Preamble – contains a bit pattern such as 10101010 (like a square wave) and used for synchronization SFD – indicates start of the frame indicates individual address,multicast address, broadcast address etc.
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DCN_rpj12 - NT503: Data Communication & Networking LAN...

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