{"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\/et\/blog\/administrirovanie\/50-letnij-modem-vzglyad-iznutri","title":{"rendered":"50-aastane modem: pilk sissepoole","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"50-aastane
\n
\nM\u00f5ni aasta tagasi k\u00fclastas autor antiikvarade turgu, mille korraldas W6TRW Northrop Grummani parklas Redondo Beachis, Kalifornias. Televisioonide, mis meenutasid j\u00e4\u00e4karusid, ja palju telefonilaadijaid ning toiteallikaid vahel paistis puidust kast, millel oli lukku, puidust k\u00e4epide ja k\u00fcljel DB-25 pesa. Pesa k\u00f5rval oli l\u00fcliti: pooldupleks \u2014 t\u00e4isdupleks. Autor m\u00f5istis, millega on tegu. Modem. Puidust modem. T\u00e4psemalt \u00f6eldes \u2014 modem akustilise paarimisega, mille valmistas Livermore Data Systems umbes 1965. aastal.<\/a><\/noindex><\/p>\n

\"50-aastane
\n
\nModem on endiselt antiikvarade turul. Vahetult p\u00e4rast pildistamist ostis autor selle 20 dollari eest.<\/i><\/p>\n

Kuna k\u00f5ik ei pruugi teada, mis on akustilise paarimisega modem \u2014 v\u00e4ikene ekskurs ajaloos. Probleem oli selles, et kunagi ei olnud telefoniteenuste ettev\u00f5tete omand ainult liinid. Need pidid rentima ka telefoniseadmed. Need lugejad, kes m\u00e4letavad dial-up'i, \u00fchendasid modemid otse telefoniliinidega. Ja siis, kui see modem valmistati, oli seda keelatud teha. Vastavalt 1934. aasta Ameerika seadusele ei olnud kodustele telefonidele midagi \u00fchendamine \u00fcldse lubatud. Aastal 1956 p\u00e4rast kohtuasja Hush-A-Phone Corp v. United States leevendati reeglit: mehhaniliselt<\/i> \u00fchendamine muutus lubatuks. Hush-A-Phone \u2014 see on selline asi<\/a><\/noindex>.<\/p>\n

Ametlikult lubati erinevaid seadmeid telefoniliiniga elektriliselt \u00fchendada Ameerikas 1968. aastal (otsus Carterphone<\/a><\/noindex>). Kuid kuni 1978. aastani ei saanud seda v\u00f5imalust kasutada, kuna tariifid, spetsifikatsioonid ja sertifitseerimise meetodid polnud v\u00e4lja t\u00f6\u00f6tatud. Seet\u00f5ttu oli aastatel 1956 kuni 1978 m\u00f5istlik kasutada akustilise paarimisega modemeid ja automaatvastajaid. Praktikas toodeti neid kauem \u2014 harjumuse j\u00e4rgi.<\/p>\n

See modem, which now sits on the author's desk, is an integral yet unusual page in history. It was made before the Carterphone decision, and therefore cannot be connected directly to the telephone network. It was designed before many of the chips that are now considered classic. The first version of this modem was released just a year after the Bell 103, the first commercially successful modem. Before you is a wonderful example of how much can be 'squeezed out' of just thirteen transistors. Later, this modem was forgotten for a long time until two videos were made about it, one in 2009 and another in 2011.<\/p>\n

\r\n \"M\u00e4ngi\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

\r\n \"M\u00e4ngi\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

The video blogger phreakmonkey received an early model of the modem with a serial number just over 200. Such modems are distinguished by walnut wood cases, the parts of which are connected with 'dovetail' joints. According to phreakmonkey, this feature can determine how old the modem is, since 'dovetail' joints are labor-intensive. Starting with serial number 850, modems began to be placed in teak wood cases with box joints. Then the parts of the case began to be connected with tongue and groove joints. Livermore Data Systems needed to make modems faster and faster.<\/p>\n

In 2007, blogger Brent Hilpert took a look inside such a modem and described its structure<\/a><\/noindex>. Particularly interesting is its schematic. All thirteen transistors in the modem are standard and were widely available at that time. One germanium PNP transistor is used there for a reason unknown to the author. Transistors of all these types are still easily found in old stocks. For about twenty dollars, you can have a complete set of transistors needed to replicate exactly the same modem. However, you will also need other components, including miniature transformers.<\/p>\n

\"50-aastane
\n
\nThe actual acoustic coupling device from the modem was removed by someone; the rest fully complies with the documentation. There are three boards on the cross plate. The first contains all the PSU components except the transformer, the second contains the modulator, and the third contains the demodulator. The transistors 2N5138 are dated: week 37 of 1969. A more precise date for the modem's release could not be established, but it is likely that it was made and shipped before 1970.<\/p>\n

\"50-aastane
\n
\n\"50-aastane
\n
\nTongue and groove joint means the modem is from a later production run.<\/i><\/p>\n

\"50-aastane
\n
\n\"50-aastane
\n
\n\"50-aastane
\n
\n\"50-aastane
\n
\n\"50-aastane
\n
\nAutor ostis selle modemi lihtsalt oma valdusesse. See on puidust modem, kuid t\u00f5en\u00e4oliselt ei kujuta keegi autorist tuttavatest ette, kui \u00e4ge see on. See on kunstiteos, milles on palju ebatavalist. Autor soovis seda parandada, kuid m\u00f5istis, et see pole praktiline.<\/p>\n

Esiteks, selleks tuleb leida originaalne akustilise liitmise seade. Selle puudumise t\u00f5ttu ei saanud kirbuturu k\u00fclastajad aru, milline seade nende ees on. Livermore Data Systemsi s\u00fcmbol ja sari number olid algselt sellel seadmel, kuid n\u00fc\u00fcd, kui neid pole, on teiste k\u00fclastajate jaoks toote \u00e4ratundmine, kuna nad ei ole arvutimuseumi t\u00f6\u00f6tajad, keeruline. Loomulikult on ahvatlev printida akustilise liitmise seadme detaile, aga kas seda t\u00f5esti j\u00f5utakse teha?<\/p>\n

Teiseks, sellel on kindlasti paljude kondensaatorite parameetrid \"p\u00f5genenud\". Loomulikult on huvitav v\u00f5tta ja k\u00f5ik plaadid \u00fcle vaadata, kuid kui autor soovib t\u00f6\u00f6tavat modemit akustilise liitmisega, on olemas parem variant.<\/p>\n

R\u00e4\u00e4gime nutikast konstruktsioonist nimega «andmete tualett<\/a><\/noindex>«, mille t\u00f6\u00f6tas v\u00e4lja Chaos Computer Club 1985. aastal vastusena sarnasele keelule, mis toimis sel ajal Saksamaa F\u00f6deraalriigis. Selline modem on \u00fcles ehitatud lihtsamalt, kuid selle v\u00f5imalused on ulatuslikumad. See on valmistatud kiibist AM7910, mis on endiselt m\u00f5nikord m\u00fc\u00fcgil, ja t\u00f6\u00f6tab kiirusel kuni 1200 Baud. Selle p\u00f5hjal saab modemi nullist ehitada kiiremini kui diskreetsetest transistoridest.<\/p>\n

Kokkuv\u00f5ttes pole selle puidust modemi taastamisel m\u00f5tet, kuid selle lahtiv\u00f5tmine, fotoseeria korraldamine ja k\u00f5ike kokku panemine oli v\u00e4ga huvitav. Umbes nii n\u00e4gi peaaegu kogu elektroonika v\u00e4lja, kuni seal mikrokiibid sees olid. Kuid kui autor satub sobivale akustilise liitmise seadmele, siis m\u00f5tleb ta kindlasti veel kord, et kas \u00e4kki tasuks ikkagi remontimisega tegelema hakata?
\n
Allikas: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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