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6.02 Spring 2012 Lectures #24 & 25 1848 5/25/12 It is anticipated that the whole of the populous parts of the United States will, within two or three years, be covered with net-work like a spider's web. 6.02 Spring 2012 Course When was this sentence written? Lectures #24 & 25 Eval! A Brief History of the Internet Wrap-up of 6.02 Some pictures from Prof. Randy Katz, UC Berkeley Several pictures from Wikipedia 6.02 Spring 2012 Lecture 25, Slide #1 6.02 Spring 2012 Lecture 25, Slide #2 1848 Visual communications: The optical telegraph (1790s) About the electric telegraph In The London Anecdotes, 1848 As quoted in Tom Standage, The Victorian Internet Pics: Proc. Symp. on the Optical Telegraph, Stockholm, June ’94 • Chappe (1763-1805), a “defense contractor”; 1st message successfully sent in 1794 • 1799: Napoleon seizes power; sends “Paris is quiet, and the good citizens are content.” • 1814: Extends from Paris to Belgium & Italy • 1840: 4000 miles, 556 stations, 8 main lines, 11 sublines, each hop ~10 km • Many “advanced” techniques: switching, framing, codes, redundant relays, message acks, priority messages, error notification, primitive encryption! 6.02 Spring 2012 Lecture 25, Slide #3 6.02 Spring 2012 Lecture 25, Slide #4 1 5/25/12 Advances in Electricity and Magnetism The Electric Telegraph (Late 18th and 19th centuries) • Cooke and Wheatstone, • Jean-Antoine Nollet (1746): Railroad Telegraph, 1837 “electricity travels fast” experiment… on humans! • Oersted (Copenhagen), 1820: demonstrated electricity’s ability to deflect a needle • Sturgeon (London), 1825: electromagnet demo • Joseph Henry, 1830: 1-mile demo: current through long wires using electric relay, causing bell to ring! • First pickpocket arrest: 1844 • Faraday (London), 1831: EM • First murder arrest: 1845 induction experiments (induction ring), basis for motors – “World’s greatest experimentalist” 6.02 Spring 2012 Lecture 25, Slide #5 6.02 Spring 2012 Lecture 25, Slide #6 The Morse-Vail Telegraph Dots and Dashes Span the Globe 1836: Morse design Vail: powerful electromagnets – 1852: First international telegram – Reuters establishes “Telegraph Morse Code (1835-1837) News Network” • By Morse & Vail • 1838: demo’d over 2 miles – 1858: First transatlantic cable laid • 1844: US-sponsored demo by the Atlantic Telegraph Co. between Baltimore and • US President & Queen Victoria Washington DC exchange telegrams • Line fails in a few months – 1866: New cable & technology developed by William Thompson (Lord Kelvin), scientific advisor to the company • Proposed using copper for cabling, analyzed data rates, etc. America’s first telegram (1844) 6.02 Spring 2012 Lecture 25, Slide #7 6.02 Spring 2012 Lecture 25, Slide #8 2 5/25/12 Early Uses “The Victorian Internet” Valentine by a Telegraph Clerk (male) to a Telegraph Clerk (female): "The tendrils of my soul are twined 1891 With thine, though many a mile apart, And thine in close-coiled circuits wind Around the needle of my heart. "Constant as Daniell, strong as Grove, Ebullient through its depths like Smee, My heart pours forth its tide of love, And all its circuits close in thee. Who or what are Daniell, Grove and Smee?! "O tell me, when along the line From my full heart the message flows, What currents are induced in thine? A: Types of batteries One click from thee will end my woes." Through many an Ohm the Weber flew, And clicked this answer back to me, -- "I am thy Farad, staunch and true, Charged to a Volt with love for thee." 6.02 Spring 2012 Lecture 25, Slide #9 6.02 Spring 2012 Lecture 25, Slide #10 Dots and Dashes Span The Globe Wireless to the Rescue! • Communications arms race in the Imperial Age James Clerk Maxwell (1831-1879) – No nation could trust its messages to a foreign power "... we have strong reason to conclude that light itself -- including radiant heat, and other – 1893: British-owned Eastern Telegraph Company and the radiations if any -- is an electromagnetic French crisis in Southeast Asia disturbance in the form of waves propagated – 1914: British cut the German overseas cables within through the electromagnetic field according to hours of the start of WW I electromagnetic laws." Dynamical Theory of the – Germany retaliates by cutting England’s Baltic cables and Electromagnetic Field, 1864. the overland lines to the Middle East through Turkey • Strategic necessity: circumventing the tyranny of the telegraph lines owned by nation states Heinrich Hertz (1857 - 1894) – 1886-88: Demonstrated experimentally the wave character of electrical transmission in space, validating Maxwell’s theory 6.02 Spring 2012 Lecture 25, Slide #11 6.02 Spring 2012 Lecture 25, Slide #12 3 5/25/12 Wireless Telegraphy - I Wireless Telegraphy - Commercialization • 1893-94: Nikola Tesla demonstrates wireless • Guglielmo Marconi communication using spark gap transmitter – 1896: announces his invention of radio in St. Louis, and then in Europe – 1897: awarded British patent for radio • 1894: Jagdish Chandra Bose invents the (much controversy over priority) coherer, a device to detect EM waves – 1897: Demonstrates system on Salisbury (semiconductor crystals) Plain to British Royal Navy, who becomes an early customer – Public demo of microwave communication – 1901: First wireless transmission across – “The invisible light can pass through brick walls, the Atlantic buildings, etc. Therefore messages can be – 1907: Regular commercial service transmitted… without the mediation of wires.” commenced – Anticipated the existence of semiconductors 60 • Lee de Forest years ahead! – Invents a vacuum tube device called the “audion” – Competes with Marconi wireless: interference due to spark gap transmitters (wide bandwidth) 6.02 Spring 2012 Lecture 25, Slide #13 6.02 Spring 2012 Lecture 25, Slide #14 Wireless Telegraph: Modulation Fessenden and Armstrong From Brant Rock tower, radio age was sparked Amplitude modulation (Fessenden’s heterodyne By Carolyn Y. Johnson, Globe Staff | July 30, 2006 principle) Fessenden started scientific work with Edison MARSHFIELD, MA -- A century ago*, radio pioneer His application to Edison said Reginald A. Fessenden used a massive 420-foot radio “Do not know anything about electricity, but tower that dwarfed Brant Rock to send voice and music to can learn pretty quick.” ships along the Atlantic coast, in what has become known Edison wrote back to say as the world's first voice radio broadcast. “Have enough men now that do not know Audio Signals Carried on Electromagnetic Waves about electricity.” Propagating through the Atmosphere Was awarded around 500 patents! Edwin Armstrong: Frequency modulation (FM) “Superheterodyne receiver” (1918) Convert received signal to an intermediate frequency for more convenient processing *Christmas Eve, 1906 6.02 Spring 2012 Lecture 25, Slide #15 6.02 Spring 2012 Lecture 25, Slide #16 4 5/25/12 Wireless in Warfare In the Meantime, in the Wired World… • The telegraph learns to talk • Morse telegraph: no multiplexing – Only one message sent/received at a time • Second half of 19th century: many researchers work on improving capacity • Idea: send messages at different pitches “Portable” radio, circa 1915 Airborne radio telephone, – Alexander Graham Bell – harmonic telegraph post WW I – Develops way to send different source frequencies by adjusting current levels 6.02 Spring 2012 Lecture 25, Slide #17 6.02 Spring 2012 Lecture 25, Slide #18 Mechanical Telephone Switch The Telephone Almon Brown Strowger (1839 - 1902) – 1889: Invents the “girl-less, cuss-less” telephone Alexander Graham Bell system – 1876: 2-mile wired phone conversation between Cambridgeport and Boston – Bell and Elisha Gray patent conflict – Bell offers to sell patents to Western Union for $100,000, who refuse. – Bell Telephone Company founded 9 July 1877. – 1879: Chairman of Western Union says he would be happy to pay $25M for telephone; Bell refuses – Western Union competes using rival system designed by Thomas Edison and Elisha Gray. Bell sues and wins. Many many lawsuits over next decades 6.02 Spring 2012 Lecture 25, Slide #19 6.02 Spring 2012 Lecture 25, Slide #20 5 5/25/12 “Ma Bell” and the Telcos The Golden Age of Information Theory • Claude Shannon, 1948: • Bell’s patents expire in 1890s; over 6000 independent A Mathematical Theory of Communication operators spring up • MIT Master’s Thesis (1937) – 1910: Bell System controls 50% of local telephone market – A symbolic analysis of relay and switching circuits – 1913: AT&T & U.S. reach Kingsbury Agreement: AT&T becomes – Connected Boolean algebra to logic circuits regulated monopoly while promising "universal" telephone service – Very influential in digital circuit design. • 1950: Bell controls 84% of the local telephone access – “Most important Masters thesis of the century” market • MIT PhD (1940) • 1984: Divesture of “Ma Bell” (Judge Greene) – An algebra for theoretical genetics • 1996: Trivestiture of AT&T Bell (AT&T, Lucent, NCR) – To analyze dynamics of Mendelian populations • 2000s: The death of the classic wired telephone • Joined Bell Labs (until 1956) network – “A mathematical theory of cryptography” • Returned to MIT as Professor (1956-78) • Seminal findings on channel capacity, among many other things 6.02 Spring 2012 Lecture 25, Slide #21 6.02 Spring 2012 Lecture 25, Slide #22 Coding The Dawn of Packet Switching • Source codes ARPA: 1957, in response to Sputnik – Shannon-Fano coding: proposed in Shannon’s 1948 work, Paul Baran (RAND Corp) attributed there to Fano (first prefix-free code; all codewords – Early 1960s: New approaches for within one bit of –log(p_i) survivable comms systems;
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