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Network Basics: Circuit-siwtching vs. packet-switching

Dive into the fundamentals of circuit switching and packet switching in communication networks. Explore the roles of switching nodes and stations in data transmission and learn about the impact of packet size on transmission time.

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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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