Lecture3_trans_switch - IS1070 T2000 Intro to Telecom...

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IS1070 / T2000 Intro to Telecom Transport Layer & Intro to Switching
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Course structure Network Overview Internet, TCP/IP, OSI Overarching issues : Network security & management, Convergence Underlying technology : Signals & infrastructure Network++ Internet details, LANs & WANs External apps Descr data types & dist data proc Internal apps How email, www, cli-serv work A C B D E F
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Learning Objectives Describe the functions of the transport layer Describe the primary features of TCP Explain the relationship between TCP and IP Differentiate UDP and TCP Differentiate circuit and packet switching Describe industry structure in the voice and internet industries Describe some technical features of Internet and voice networks
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OSI Reference Model App, itself Network’s interface to app, user, & ext system Network processes for Transporting & delivering data (2/3 of this course) Introduced today Why?, Where?, How?
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Switching
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Approaches to switching Circuit Dedicated path established between source and destination Resource committed for the duration of the session Message Message is forwarded from switch to switch Packet Special case of message switching Large messages broken into smaller packets
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Approaches to switching Circuit Switching        Message Switching      Packet Switching
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Approaches to switching Circuit Switching Packet switching  (Virtual circuit) Packet Switching  (Datagram)
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Circuit Switching
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Circuit Switching
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Packet switching Datagrams: Each packet is treated independently Virtual circuit: A path is established before packets are sent
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Packet switching using datagrams
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Packet switching using virtual circuits
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Packet Switching v Circuit Switching Data transport over circuit-switch channels Circuit is unused when there’s no traffic Most of the time, if traffic is bursty (key strokes, file transfers) About 2/3 of the time for (half-duplex) voice End points must transmit/receive at constant fixed speed, limiting variety of devices that can be connected * (modem) Data transport using packet switching Transmission medium is more efficiently used Can send packets from several users over same link * (mux ) Devices that transmit at different speeds can communicate with each other Priority can be given to certain packets Congestion calls aren’t blocked; packets may be delayed, but continue to be accepted * (overflow) *Over-simplified
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