{"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\/hr\/blog\/administrirovanie\/50-letnij-modem-vzglyad-iznutri","title":{"rendered":"50-godi\u0161nji modem: pogled iznutra","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/ebe0f3e7fc52d9578faea3191d415e43.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPrije nekoliko godina autor je posjetio buvljak koji je organizirao W6TRW na parkirali\u0161tu tvrtke Northrop Grumman u Redondo Beachu, Kalifornija. Izme\u0111u televizora koji su izgledali poput bijelih medvjeda i mno\u0161tva punja\u010da za telefone i napajanja, nazirao se drveni kutija s bravom, drvenom ru\u010dkom i DB-25 priklju\u010dkom sa strane. Pored priklju\u010dka nalazio se prekida\u010d: poludupleks \u2014 puni dupleks. Autor je shvatio \u0161to je to. Modem. Drveni modem. Naime, modem s akusti\u010dkom vezom, proizveden od strane Livermore Data Systems otprilike 1965. godine.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p><img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/ef0c11dfbcadf7b80f216afd7d19e6ee.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<i>Modem je jo\u0161 uvijek na buvljaku. Odmah nakon fotografiranja, autor ga je kupio za 20 dolara.<\/i><\/p>\n<p>Budu\u0107i da ne znaju svi \u0161to je modem s akusti\u010dkom vezom \u2014 mali pregled povijesti. Problem je bio u tome \u0161to nekada telefonske kompanije nisu posjedovale samo linije. Moralo se iznajmljivati i telefonske aparate. Oni \u010ditatelji koji su iskusili dial-up, direktno su povezivali modeme s telefonskim linijama. U to vrijeme, kada je ovaj modem napravljen, to je bilo zabranjeno. Prema ameri\u010dkom zakonu iz 1934. godine, nije se smjelo povezivati ni\u0161ta s ku\u0107nim telefonom na nikakav na\u010din. Godine 1956. nakon slu\u010daja Hush-A-Phone Corp v. United States, pravilo je ubla\u017eeno: <i>mehani\u010dki<\/i> povezivanje je postalo mogu\u0107e. Hush-A-Phone \u2014 to je <noindex><a rel=\"nofollow\" href=\"https:\/\/en.m.wikipedia.org\/wiki\/Hush-A-Phone\">evo \u0161to<\/a><\/noindex>.<\/p>\n<p>Formalno je povezivanje razli\u010ditih ure\u0111aja na telefonsku liniju elektri\u010dki u SAD-u dozvoljeno 1968. godine (<noindex><a rel=\"nofollow\" href=\"https:\/\/web.archive.org\/web\/20150120021035\/http:\/\/www.uiowa.edu\/~cyberlaw\/FCCOps\/1968\/13F2-420.html\">odluka Carterphone<\/a><\/noindex>). No do 1978. godine nije se mogla iskoristiti ta mogu\u0107nost, budu\u0107i da nisu razvijene tarife, specifikacije i metodologije certifikacije. Stoga je od 1956. do 1978. godine imalo smisla koristiti akusti\u010dki spojene modeme i automatske odgovara\u010de. U praksi su se proizvodili du\u017ee \u2014 iz inercije.<\/p>\n<p>Ovaj modem, koji se trenutno nalazi na stolu autora, nezaobilazna je, ali neobi\u010dna stranica povijesti. Izra\u0111en je prije odluke Carterphone, pa se ne mo\u017ee izravno povezati na telefonsku mre\u017eu. Dizajniran je prije razvoja mnogih \u010dipova koji se danas smatraju klasi\u010dnima. Prva verzija ovog modema objavljena je samo godinu dana nakon Bell 103, prvog komercijalno uspje\u0161nog modema. Pred vama je izvrstan primjer kako se mo\u017ee 'izvu\u0107i' mnogo mogu\u0107nosti iz samo trinaest tranzistora. Kasnije je ovaj modem dugo bio zaboravljen, sve dok nisu snimljena dva videa, jedan 2009. godine, a drugi 2011. godine:<\/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=\"Pogledajte 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=\"Pogledajte 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>Videobloggeru phreakmonkeyu pripao je rani primjerak modema s serijskim brojem ne\u0161to ve\u0107im od 200. Ovi modemi se razlikuju po ku\u0107i\u0161tima od orahovog drva, \u010diji su dijelovi povezani 'lastavi\u010djim repovima'. Prema mi\u0161ljenju phreakmonkeya, po ovom znaku se mo\u017ee odrediti koliko je modem star, budu\u0107i da su 'lastavi\u010dji repovi' zahtjevni za izradu. Od serijskog broja 850, modemi su po\u010deli dolaziti u ku\u0107i\u0161tima od tikovine s kutnim spojnicama. Zatim su dijelovi ku\u0107i\u0161ta po\u010deli biti povezivani jezi\u010dcima. Tvrtka Livermore Data Systems trebala je proizvoditi modeme sve br\u017ee i br\u017ee.<\/p>\n<p>Godine 2007. bloger Brent Hilpert zavirio je u takav modem i <noindex><a rel=\"nofollow\" href=\"http:\/\/madrona.ca\/e\/LDSA\/index.html\">opisao njegovu strukturu<\/a><\/noindex>. Osobito je zanimljiv njegov sklop. Sva tri trinaest tranzistora u modemu su standardni i tada \u0161iroko rasprostranjeni. Jedan germanski PNP tranzistor kori\u0161ten je iz razloga koji autoru nije jasan. Tranzistori svih ovih tipova i danas se lako mogu prona\u0107i u starim zalihama. Ukupno oko dvadeset dolara - i u va\u0161im rukama je kompletan set tranzistora potrebnih za ponavljanje identi\u010dnog modema. Naravno, bit \u0107e potrebni i drugi dijelovi, uklju\u010duju\u0107i mini transformatore.<\/p>\n<p><img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/8bc0100ce71bb732af468a869054f02d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSama struktura akusti\u010dnog povezivanja iz modema je izvu\u010dena, ostatak potpuno odgovara dokumentaciji. Na krrossoveru se nalaze tri plo\u010de. Na prvoj su svi dijelovi napajanja, osim transformatora, na drugoj je modulacija, a na tre\u0107oj demodulacija. Na tranzistorima 2N5138 ozna\u010den je datum: 37. tjedan 1969. godine. To\u010dnije utvrditi datum proizvodnje samog modema nije uspjelo, ali vjerojatno je izra\u0111en i isporu\u010den prije 1970. godine.<\/p>\n<p><img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/1dfcc6ad00a1eaf1ab4c35ec88622018.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/53f2d99ad32bba9813e13a4207307476.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<i>Spoj jezi\u010dkom zna\u010di da je modem kasnije proizveden<\/i><\/p>\n<p><img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/e7a8be9ceaa9ddc2f7b021fd05e2f84c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/2d925175f842b4baa1b3d1a8be895bec.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/b7f1a9ff985722ee6f6feeee9ff4147d.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/756c479bd23de0e5953b30ecf415f4e0.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"50-godi\u0161nji modem: pogled iznutra\" src=\"\/wp-content\/uploads\/2019\/04\/4c67ff1fbae36ffe2b38e47ed8ea558b.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAutor je kupio ovaj modem samo da bi ga imao. To je drveni modem, ali te\u0161ko da itko od autorovih poznanika mo\u017ee zamisliti koliko je cool. To je umjetni\u010dki objekt s puno neobi\u010dnih karakteristika. Autor ga je namjeravao popraviti, ali je shvatio da to nije isplativo.<\/p>\n<p>Prvo, bit \u0107e potrebno prona\u0107i originalni ure\u0111aj za akusti\u010dno povezivanje. Zbog njegovog nedostatka posjetitelji buvljaka nisu shva\u0107ali \u0161to imaju pred sobom. \u017dig Livermore Data Systems i serijski broj prvotno su bili na ovom ure\u0111aju, a sada njihovo odsustvo samo ote\u017eava identifikaciju proizvoda kao modema od strane drugih posjetitelja, jer oni nisu zaposlenici ra\u010dunalnih muzeja. Zasigurno je primamljivo isprintati dijelove akusti\u010dnog povezivanja, ali ho\u0107e li se to ikada dogoditi?<\/p>\n<p>Drugo, u njemu su sigurno 'isplivali' parametri mnogih kondenzatora. Naravno, zanimljivo je rasklopiti sve plo\u010de, ali ako autor \u017eeli dobiti funkcionalni modem s akusti\u010dnim povezivanjem, postoji bolja opcija.<\/p>\n<p>Radi se o duhovitoj konstrukciji pod nazivom &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/de.wikipedia.org\/wiki\/Datenklo\">WC za podatke<\/a><\/noindex>&#171;, koju je razvila Chaos Computer Club 1985. godine kao odgovor na sli\u010dnu zabranu koja je tada jo\u0161 uvijek bila na snazi u Njema\u010dkoj. Ovaj modem je jednostavniji u izradi, a njegove mogu\u0107nosti su ve\u0107e. Izra\u0111en je na \u010dipu AM7910, koji se jo\u0161 uvijek ponekad mo\u017ee prona\u0107i u prodaji, i radi na brzinama do 1200 bps. Na njemu se modem mo\u017ee izraditi br\u017ee nego na diskretnih tranzistorima.<\/p>\n<p>Ukratko, nema smisla obnavljati ovaj drveni modem, ali je bilo jako zanimljivo razmontirati ga, napraviti fotografije i sastaviti sve natrag kako je bilo. Tako je izgledala gotovo sva elektronika unutra dok nisu dodani \u010dipovi. No, ako autor nai\u0111e na odgovaraju\u0107i ure\u0111aj za akusti\u010dno povezivanje za ovaj modem, sigurno \u0107e se jo\u0161 jednom zapitati: a mo\u017eda ipak vrijedi poku\u0161ati popraviti?<br \/>\n<br \/>Izvor: <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 \u0420\u0435\u0434\u043e\u043d\u0434\u043e-\u0411\u0438\u0447, 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\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 - 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