MIS365 3 - Data Link Layer

MIS365 3 - Data Link Layer - MIS365 Data Communications &...

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MIS365 Jerry Malcolm Data Link Layer
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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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History The evolution of what key concept in manufacturing led to the American Industrial Revolution? Interchangeable parts Resulting in: Standards Specializations Reuse
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History (cont) Common pattern in many areas and technologies Initially: Single source for everything Evolves to: Specializations and Reuse Examples Manufacturing Sports No such thing as a “middle reliever” or “closer” in Major League Baseball 50 yrs ago Electronics Transistors Integrated circuits Microprocessors Software Procedural, end to end programming Object Oriented Programming Data Communications…
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Sidebar… We’ll get to Data Communications history shortly First, a discussion on some basic building blocks…
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Standards For successful communications to occur, both sides have to agree on how information will be encoded / transmitted This has been the case from the beginning: Cave drawings Hieroglyphics Smoke signals Semaphors Morse Code
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Binary The digital world can be summarized in two words: On Off The meaning of On/Off can vary somewhat depending on the media But the concept is always the same On (e.g. +5 volts; presence of a tone; etc.) Off (e.g. -5 volts; 0 volts; absence of the tone; etc.) On and Off are represented by: 1 0
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Binary (cont) A single 1 or 0 alone has limited usefulness But if several 1’s and 0’s are grouped together in a certain order, the group can be used to convey more information. A ‘bit’ (i.e. ‘ bi nary digi t ) is one position in the group that can either be a 1 or a 0
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Binary Combination of 4 bits 0 – 0000 (x’0’) 1 - 0001 (x’1’) 2 - 0010 (x’2’) 3 - 0011 (x’3’) 4 - 0100 (x’4’) 5 - 0101 (x’5’) 6 - 0110 (x’6’) 7 - 0111 (x’7’) 8 - 1000 (x’8’) 9 - 1001 (x’9’) 10 - 1010 (x’A’) 11 - 1011 (x’B’) 12 - 1100 (x’C’) 13 - 1101 (x’D’) 14 - 1110 (x’E’) 15 - 1111 (x’F’)
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Using Binary for Real Data This still isn’t all that useful unless we can apply it to something we really need We communicate using words made up from
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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 3 - Data Link Layer - MIS365 Data Communications &...

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