2CSE3213_02_PacketSwitchingW2012

2CSE3213_02_PacketSwitchingW2012 - Terminal-Oriented...

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6 Terminal-Oriented Computer Networks Terminal-Oriented Computer Networks of 1960s and 1970s early computers were extremely expensive, so time-sharing techniques were developed to allow them to be shared by many users through use of video/keyboard terminals multiple users were able to simultaneously input instructions and obtain results from the host computer modem devices * further enabled that terminals reach the host computer via telephone network, over a greater distance Host computer Terminal Terminal . . . Terminal Modem Modem Telephone Network (*) modem – device for sending digital data over phone line / analog network
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7 Terminal-Oriented Computer Networks (cont.) Example [ modulation / demodulation ]
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8 Terminal-Oriented Computer Networks (cont.) Line Sharing Challenges: in a mainframe system, a large number of terminals had to be connected to a central computer cost of providing individual lines to each terminal was prohibitive line sharing was more practical, but - how to
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2CSE3213_02_PacketSwitchingW2012 - Terminal-Oriented...

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