{"id":30674,"date":"2019-10-31T21:36:50","date_gmt":"2019-10-31T18:36:50","guid":{"rendered":"https:\/\/prohoster.info\/blog\/50-letnij-modem-vzglyad-iznutri\/"},"modified":"2019-10-31T21:36:50","modified_gmt":"2019-10-31T18:36:50","slug":"50-letnij-modem-vzglyad-iznutri","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/administrirovanie\/50-letnij-modem-vzglyad-iznutri","title":{"rendered":"50-\u00e5rig modem: en inblick p\u00e5 insidan","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/ebe0f3e7fc52d9578faea3191d415e43.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nF\u00f6r flera \u00e5r sedan bes\u00f6kte f\u00f6rfattaren en loppmarknad som arrangerades av W6TRW p\u00e5 parkeringsplatsen till Northrop Grumman i Redondo Beach, Kalifornien. Mellan tv-apparater som p\u00e5minde om isbj\u00f6rnar och en m\u00e4ngd laddare f\u00f6r telefoner och str\u00f6mf\u00f6rs\u00f6rjningar skymtade en tr\u00e4box med l\u00e5s, tr\u00e4handtag och en DB-25-kontakt p\u00e5 sidan. Bredvid kontakten fanns en omkopplare: halvdublex \u2014 full dupleks. F\u00f6rfattaren ins\u00e5g vad det var. En modem. En tr\u00e4modem. Mer specifikt \u2014 en modem med akustisk koppling, tillverkad av Livermore Data Systems runt 1965.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/ef0c11dfbcadf7b80f216afd7d19e6ee.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<i>Modemet \u00e4r fortfarande p\u00e5 loppmarknaden. Direkt efter fotograferingen k\u00f6pte f\u00f6rfattaren det f\u00f6r 20 dollar.<\/i><\/p>\n<p>Eftersom inte alla vet vad en akustisk kopplingsmodem \u00e4r \u2014 en liten historielektion. Problemet var att en g\u00e5ng i tiden \u00e4gdes inte bara linjer av telefonbolagen. Man var tvungna att hyra \u00e4ven telefoner. De l\u00e4sare som upplevt uppringning kopplade modem direkt till telefonlinjer. Men n\u00e4r detta modem tillverkades var det f\u00f6rbjudet att g\u00f6ra s\u00e5. Enligt den amerikanska lagen fr\u00e5n 1934 var det helt f\u00f6rbjudet att koppla n\u00e5got till hemmatelefonen p\u00e5 n\u00e5got s\u00e4tt. \u00c5r 1956, efter fallet Hush-A-Phone Corp v. United States, mildrades regeln: <i>mekaniskt<\/i> blev det till\u00e5tet att koppla. Hush-A-Phone \u00e4r <noindex><a rel=\"nofollow\" href=\"https:\/\/en.m.wikipedia.org\/wiki\/Hush-A-Phone\">detta i slutet av utskriften<\/a><\/noindex>.<\/p>\n<p>Formellt till\u00e4ts det elektriskt att koppla olika apparater till telefonlinjen i USA 1968 (<noindex><a rel=\"nofollow\" href=\"https:\/\/web.archive.org\/web\/20150120021035\/http:\/\/www.uiowa.edu\/~cyberlaw\/FCCOps\/1968\/13F2-420.html\">Carterphone-beslutet<\/a><\/noindex>). Men fram till 1978 kunde man inte anv\u00e4nda denna m\u00f6jlighet, eftersom tariffar, specifikationer och certifieringsmetoder inte hade utvecklats. D\u00e4rf\u00f6r var det mellan 1956 och 1978 meningsfullt att anv\u00e4nda akustiskt kopplade modem och telefonsvarare. I praktiken tillverkades de l\u00e4ngre \u2014 av tr\u00f6ghet.<\/p>\n<p>Den h\u00e4r modemet, som just nu st\u00e5r p\u00e5 f\u00f6rfattarens skrivbord, \u00e4r en oumb\u00e4rlig men ovanlig del av historien. Den tillverkades f\u00f6re Carterphone-beslutet, och d\u00e4rf\u00f6r kan den inte anslutas direkt till telefonn\u00e4tet. Den designades f\u00f6re utvecklingen av m\u00e5nga kretsar som idag anses vara klassiska. Den f\u00f6rsta versionen av detta modem lanserades bara ett \u00e5r efter Bell 103, den f\u00f6rsta kommersiellt framg\u00e5ngsrika modemet. H\u00e4r har vi ett utm\u00e4rkt exempel p\u00e5 hur mycket man kan \"utvinna\" med bara tretton transistorer. Sedan gl\u00f6mdes det h\u00e4r modemet l\u00e4nge, tills tv\u00e5 videor gjordes om det, en 2009 och den andra 2011:<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"X9dpXHnJXaE\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/X9dpXHnJXaE\/hqdefault.jpg\" alt=\"Spela video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"RxM_0BguTkE\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/RxM_0BguTkE\/hqdefault.jpg\" alt=\"Spela video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><\/p>\n<p>Videobloggaren phreakmonkey fick ett tidigt exemplar av modemet med ett serienummer strax \u00f6ver 200. Dessa modem k\u00e4nnetecknas av k\u00e5por av valn\u00f6tstr\u00e4, vars delar kopplas samman med \"svansar\". Enligt phreakmonkey kan man utifr\u00e5n detta k\u00e4nnetecken avg\u00f6ra hur gammalt modemet \u00e4r, eftersom \"svansarna\" \u00e4r arbetskr\u00e4vande. Fr\u00e5n serienummer 850 b\u00f6rjade modem att placeras i k\u00e5por av teaktr\u00e4 med l\u00e5dkopplingar. Sedan b\u00f6rjade delarna i k\u00e5pan att kopplas med sp\u00e5r. Livermore Data Systems beh\u00f6vde tillverka modem allt snabbare.<\/p>\n<p>\u00c5r 2007 tittade bloggare Brent Hilpert in i ett s\u00e5dant modem och <noindex><a rel=\"nofollow\" href=\"http:\/\/madrona.ca\/e\/LDSA\/index.html\">beskrev dess enhet<\/a><\/noindex>. S\u00e4rskilt intressant \u00e4r dess schema. Alla tretton transistorer i modemet \u00e4r standard och var vid den tiden allm\u00e4nt f\u00f6rekommande. En germanium PNP-transistor anv\u00e4ndes d\u00e4r av en anledning som f\u00f6rfattaren inte f\u00f6rst\u00e5r. Transistorer av alla dessa typer \u00e4r fortfarande l\u00e4tta att hitta i gamla lager. F\u00f6r omkring tjugo dollar kan du f\u00e5 ett komplett set med transistorer som kr\u00e4vs f\u00f6r att \u00e5terskapa exakt samma modem. Det kommer dock att beh\u00f6vas andra delar, inklusive mini-transformatorer.<\/p>\n<p><img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/8bc0100ce71bb732af468a869054f02d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSj\u00e4lva enheten f\u00f6r akustisk koppling fr\u00e5n modemet har n\u00e5gon tagit bort, resten st\u00e4mmer helt \u00f6verens med dokumentationen. P\u00e5 kretskortet finns tre kort. P\u00e5 det f\u00f6rsta finns alla delar f\u00f6r str\u00f6mf\u00f6rs\u00f6rjningen, f\u00f6rutom transformatorn, p\u00e5 det andra - modulatorn, p\u00e5 det tredje - demodulatorn. P\u00e5 transistorerna 2N5138 \u00e4r datumet st\u00e4mplat: vecka 37, 1969. Det har varit sv\u00e5rt att fastst\u00e4lla tillverkningsdatumet f\u00f6r modemet, men det \u00e4r troligt att det tillverkades och skickades f\u00f6re 1970.<\/p>\n<p><img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/1dfcc6ad00a1eaf1ab4c35ec88622018.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/53f2d99ad32bba9813e13a4207307476.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<i>Sp\u00e5rkopplingen inneb\u00e4r att modemet \u00e4r av senare tillverkning<\/i><\/p>\n<p><img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/e7a8be9ceaa9ddc2f7b021fd05e2f84c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/2d925175f842b4baa1b3d1a8be895bec.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/b7f1a9ff985722ee6f6feeee9ff4147d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/756c479bd23de0e5953b30ecf415f4e0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-\u00e5rig modem: en inblick p\u00e5 insidan\" src=\"\/wp-content\/uploads\/2019\/04\/4c67ff1fbae36ffe2b38e47ed8ea558b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nF\u00f6rfattaren k\u00f6pte denna modem bara f\u00f6r att ha den. Det \u00e4r en tr\u00e4modem, men det \u00e4r osannolikt att n\u00e5gon av f\u00f6rfattarens bekanta kan f\u00f6rest\u00e4lla sig hur fantastisk den \u00e4r. Det \u00e4r en konstn\u00e4rlig skapelse, med s\u00e5 mycket ovanligt. F\u00f6rfattaren ville laga den, men ins\u00e5g att det vore opraktiskt.<\/p>\n<p>F\u00f6r det f\u00f6rsta beh\u00f6ver man hitta den ursprungliga akustiska kopplingen. P\u00e5 grund av dess fr\u00e5nvaro f\u00f6rstod bes\u00f6karna p\u00e5 loppmarknaden inte vilken apparat de hade framf\u00f6r sig. Livermore Data Systems-logotypen och serienumret fanns ursprungligen p\u00e5 denna enhet, och nu g\u00f6r deras fr\u00e5nvaro det bara sv\u00e5rare att identifiera produkten som en modem f\u00f6r andra bes\u00f6kare, eftersom de inte \u00e4r anst\u00e4llda p\u00e5 datormuseer. Det \u00e4r frestande att printa detaljerna f\u00f6r den akustiska kopplingen, men kommer f\u00f6rfattaren verkligen att ta sig tid till det?<\/p>\n<p>F\u00f6r det andra har parametrarna f\u00f6r m\u00e5nga kondensatorer definitivt \"glidit iv\u00e4g\". Sj\u00e4lvklart \u00e4r det intressant att plocka is\u00e4r alla kort, men om f\u00f6rfattaren vill ha en fungerande modem med akustisk koppling, finns det en b\u00e4ttre l\u00f6sning.<\/p>\n<p>Det handlar om en smart konstruktion kallad &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/de.wikipedia.org\/wiki\/Datenklo\">data-toalett<\/a><\/noindex>&#171;, utvecklad av Chaos Computer Club 1985 som svar p\u00e5 en liknande f\u00f6rbud som fortfarande g\u00e4llde i V\u00e4sttyskland. Denna typ av modem \u00e4r enklare i konstruktionen men har fler m\u00f6jligheter. Den \u00e4r baserad p\u00e5 AM7910-chipet, som fortfarande ibland finns tillg\u00e4ngligt i handeln, och fungerar med hastigheter upp till 1200 Baud. Att bygga ett modem fr\u00e5n grunden med denna \u00e4r snabbare \u00e4n att anv\u00e4nda diskreta transistorer.<\/p>\n<p>Sammanfattningsvis finns det ingen anledning att \u00e5terst\u00e4lla denna tr\u00e4modem, men det var mycket intressant att ta is\u00e4r den, ordna en fotosession och s\u00e4tta ihop allt igen som det var. S\u00e5 h\u00e4r s\u00e5g n\u00e4stan all elektronik ut inuti, innan det fanns n\u00e5gra mikrochips d\u00e4r. Men om f\u00f6rfattaren pl\u00f6tsligt skulle f\u00e5 tag p\u00e5 en passande akustisk koppling f\u00f6r denna modem, skulle han sj\u00e4lvklart t\u00e4nka om: kanske \u00e4r det v\u00e4rt att faktiskt f\u00f6rs\u00f6ka laga den?<br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/446114\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043b\u0435\u0442 \u043d\u0430\u0437\u0430\u0434 \u0430\u0432\u0442\u043e\u0440 \u043f\u043e\u0431\u044b\u0432\u0430\u043b \u043d\u0430 \u0431\u0430\u0440\u0430\u0445\u043e\u043b\u043a\u0435, \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0439 W6TRW \u043d\u0430 \u0430\u0432\u0442\u043e\u0441\u0442\u043e\u044f\u043d\u043a\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Northrop Grumman \u0432 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\u0440\u0443\u0447\u043a\u043e\u0439 \u0438 \u0440\u0430\u0437\u044a\u0451\u043c\u043e\u043c DB-25 \u043d\u0430 \u0431\u043e\u043a\u0443. \u0420\u044f\u0434\u043e\u043c \u0441 \u0440\u0430\u0437\u044a\u0451\u043c\u043e\u043c \u2014 \u043f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0430\u0442\u0435\u043b\u044c: \u043f\u043e\u043b\u0443\u0434\u0443\u043f\u043b\u0435\u043a\u0441 \u2014 \u043f\u043e\u043b\u043d\u044b\u0439 \u0434\u0443\u043f\u043b\u0435\u043a\u0441. \u0410\u0432\u0442\u043e\u0440 \u043f\u043e\u043d\u044f\u043b, \u0447\u0442\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":22662,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-30674","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043b\u0435\u0442 \u043d\u0430\u0437\u0430\u0434 \u0430\u0432\u0442\u043e\u0440 \u043f\u043e\u0431\u044b\u0432\u0430\u043b \u043d\u0430 \u0431\u0430\u0440\u0430\u0445\u043e\u043b\u043a\u0435.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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