introduction to network ( internet and its layer) or how internet really works!
TRANSCRIPT
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Introductionto
NetworkIT Entrepreneurship course ( Dr. Meigoonpoury )
Mohammad Kermani, Fall 2015University of Tehran, Faculty of Entrepreneurship
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Google history of Network!Let’s start!
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To be abstract!
مار
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OSI ModelThe Open Systems Interconnection model (OSI Model) is a conceptual model that characterizes and standardizes thecommunication functions of a telecommunication or computing system without regard of their underlying internal structure and technology. Its goal is the interoperability of diverse communication systems with standard protocols. The model partitions a communication system into abstraction layers. The original version of the model defined seven layers.[WIKIPEDIA]
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OSI Model
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Internet Protocol Model
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What’s inside?
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Let’s play!!
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How Internet works?
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Physical / Network Interface• Wire
• Ethernet• xDSL
• Fiber• GPON• Ethernet
• Wireless• Wifi• Wimax• GSM• 3G/4G
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xDSL
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xDSL
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GPON
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Wireless
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Multiplexing/Multiple Access• TDM (TDMA)• FDM (FMA)• CDMA• SDMA
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Time Division
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Frequency Division
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Time/Frequency
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Code! WOW!
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Space Division!!?
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Sectors!
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Cellular
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Cell Planning• Size of cells• Pattern of clusters• Cost Trade-off• Telecom Finance; Erlang, ARPU, etc.
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Internet: ISPs and IXPs
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Application Layer
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Mohammad Kermani
[email protected]@ut.ac.irtelegram.me/mohkermaniInstagram.com/MohkermaniTwitter: @mohkermaniLinkedin: mohkermani