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10IPT: The Transmission Level

posted Feb 28, 2012, 12:19 PM by Eddie Woo   [ updated Feb 29, 2012, 8:04 PM by Ricky Chung ]
After looking at a variety of communications technologies from a very high-up perspective, we're now going to dig down deep into the details of things happening on the physical layer - or the 'lowest' part of the communications system framework, the transmission level. 
  1. The following tasks relate to the basic transmission of data along a physical medium.
    • Describe what is meant by a 'ping'.
    • Define the acronym 'bps' and outline how it can be used to give an approximate estimate of how long a file will take to download.
    • Use Speedtest.net to measure the school's upload and download speeds, and estimate how long it will take to download a test file. Then test your hypothesis!
    • Define 'baud rate', and illustrate the different ways that a single baud can use different signals to represent data.
    • Distinguish between the popular use of the word 'bandwidth' and its actual technical definition, then account for the different ways of using the word.

  2. The following tasks relate to error checking and correction.
    • Explain why error checking and correction are required in communications systems.
    • Outline the way in which parity checks can be used to detect errors.
    • Distinguish between odd and even parity.
    • Explain why using a checksum provides more accuracy than a parity check.
    • Compare and contrast the Cyclic Redundancy Check with the checksum.
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