HCILecture_Week10A - , ^ > , ^ / / Dial-up (1980s) 9600...

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Broadband Human-Computer Interaction Comp 3900 and Comp 6390 Semester 2, 2010 1 Lecture 10A: Human-Computer Interaction, Semester 2, 2010
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Bandwidths Dial-up (1980’s) 9600 bits/second Dial-up equivalent 56,000 bits/second ISDN (Integrated Services Digital Network) An ISDN channel transmits information at 64kbit/s (64,000 bits per second), with a line rate of 144kbit/s ggregate channels to get more bandwidth Lecture 10A: Human-Computer Interaction, Semester 2, 2010 2 Aggregate channels to get more bandwidth 128k will service a simple video phone Old videoconference systems: 384k to 768k ADSL2: Up to 24 Mbits/second up, 1.4Mbts down Domestic wireless hub 54 Mbits/second Optical fibre: 1 or more gigabits/second
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End to end Effective bandwidth between two places (for example your computer at home and the download site in the USA) is limited by: The narrowest bandwidth in the sequence of network segments between the two ends he network traffic on each of the segments Lecture 10A: Human-Computer Interaction, Semester 2, 2010 3 The network traffic on each of the segments Think of traffic jams on the M5 freeway in Sydney, or Northbourne Avenue in Canberra in peak hour. Latency is the delay between initiation of a transfer and sending the internet packets.
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Downloads Download a “large” file Movie, audio Software Text document We used to wait hours for large files to download – major disincentive for us as potential users of the files. ill an important usability issue for system design.
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This note was uploaded on 10/12/2010 for the course CSIT COMP3900 taught by Professor Duncanstevenson during the Three '10 term at Australian National University.

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HCILecture_Week10A - , ^ > , ^ / / Dial-up (1980s) 9600...

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