I&C SCI 11 Lecture Notes - Lecture 2: Packet Switching, Circuit Switching, Bit Rate
15 Jan 2017
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Ics 11 lecture 2 internet architecture and topology. What was the internet originally designed to do: hold and transfer data, data sharing for research. Example: audio files, emails, text documents: for the military. Service characteristics: variable bit rate (could be bursty) Performance: how do you measure how well your internet is running, speed the rate at which data goes from one place to another. Could always run into delay: loss not okay, throughput design variable. How: disassemble message into information packets , send them one at a time, they then reassemble at the destination. Telephone routers: packet switches and routers began to replace telephone routers, did not have allocated circuits for the calls made. They created routes for each packet to be sent individually: packets were buffered upon entry and arrival. Packet switching was known as much more efficient than circuit switching because of it"s ability to handle heavy traffic. Multiplexing by statistical means: no prior allocation, efficiency.
