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Network Basics: Circuit-siwtching vs. packet-switching

Network Basics: Circuit-siwtching vs. packet-switching. Chapter 3 (Stallings Book). Switching Terms. Switching Nodes: Intermediate switching device that moves data Not concerned with content of data Stations: End devices that wish to communicate

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Network Basics: Circuit-siwtching vs. packet-switching

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  1. Network Basics: Circuit-siwtching vs. packet-switching Chapter 3 (Stallings Book)

  2. Switching Terms • Switching Nodes: • Intermediate switching device that moves data • Not concerned with content of data • Stations: • End devices that wish to communicate • Each station is connected to a switching node • Communications Network: • A collection of switching nodes

  3. Switched Network

  4. Switching Techniques • Circuit switching • Dedicated communications path between two stations • E.g., public telephone network • Phases: Circuit establishment  Information Transfer  Circuit disconnect • Packet switching • Message is broken into a series of packets • Each node determines next leg of transmission for each packet

  5. Packet SwitchingExample

  6. Pipeline Effects • Breaking up packets decreases transmission time and allows overlapping • Figure 3.9a • Entire message (40 octets) + header information (3 octets) sent at once • Transmission time: 129 octet-times • Figure 3.9b • Message broken into 2 packets (20 octets) + header (3 octets) • Transmission time: 92 octet-times • Figure 3.9c • Message broken into 5 packets (8 octets) + header (3 octets) • Transmission time: 77 octet-times • Figure 3.9d • Making the packets too small, transmission time starts increases • Each packet requires a fixed header; the more packets, the more headers • Example: ATM’s cell = 53 bytes

  7. Effect of Packet Size on Transmission time router

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