MIS365 4 - Connection and Communications Protocol Layers

MIS365 4- - MIS365 Data Communications Networking Connection Communication Layers Jerry Malcolm Networking Message Content Vernacular Dialect XML

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MIS365 Jerry Malcolm Connection & Communication Layers
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Physical Media Media Protocol Connection Protocol Language Communication Protocol Dialect Vernacular Networking - wire; fiber-optics; radio -Wifi; Ethernet; TokenRing; -WiMax; PicoNet; TCP/UDP; NetBios; Netware IP; LAN Server HTTP; SMTP; POP; SOAP XML; MIME; UUE Message Content
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Data Transmission Protocols Review Interchangeable parts in data communications There are now service layers available handling: Low Level Routing Transmission Error Handling / retries Allows a group of technologists to emerge to concentrate on: Communication of Data Meet specific business needs What were some of the earliest “business needs”?
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Business Needs Computer data communications was not a “solution in search of a problem” Business needs emerged that led to evolution of data communications technology
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Early Business Needs 1950’s – 1970’s What were the primary business usages for data communications? Connecting a terminal to a mainframe Locally Over phone lines Mainframe Mainframe file transfer Not daily… usually when a project was transferred or computers were replaced with a newer model Minimal other uses in specialty environments Satellite / spacecraft telemetry
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Teletype Terminal
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Teletypes Teletypes were either: Hardwired to the mainframe Wired to a modem
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File Sharing All files were on the mainframe Sharing of files was implicit Minimal requirements to move files to another mainframe Usually there was only one mainframe
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Mainframe Printers Printers were attached to the mainframe Implicit access to any connected printer
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Evolving Business Need 1980’s – emergence of “ Personal Computers Problem Need to share files between individual personal computers Need to print files Businesses did not want to pay for a separate printer for every personal computer Should be a way to share a physical printer with others
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The Problem Problem is not: How to transfer data between two computers Much bigger problem… Management How can an environment of sharing and accessing these resources be managed?
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Sharing Printers Printer Issues: How do I ‘tell’ others my printer is available? How do I ‘find’ a printer? How do I ‘tell’ my computer that I want to take advantage of the services of a certain printer?
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File Sharing Issues: How do I ‘tell’ others that certain files are available? How do I ‘find’ files that are available?
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This note was uploaded on 10/20/2011 for the course MIS 365 taught by Professor Malcolm during the Spring '09 term at University of Texas at Austin.

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MIS365 4- - MIS365 Data Communications Networking Connection Communication Layers Jerry Malcolm Networking Message Content Vernacular Dialect XML

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