Network Basics: Circuit-siwtching vs. packet-switching

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Presentation transcript:

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

Switching Terms Switching Nodes: Stations: Communications Network: 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

Switched Network

Switching Techniques Circuit switching Packet 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

Packet Switching Example

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

Effect of Packet Size on Transmission time router