{"id":35148,"date":"2019-10-31T22:02:35","date_gmt":"2019-10-31T19:02:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-8-opticheskaya-magistralnaya-set\/"},"modified":"2019-10-31T22:02:35","modified_gmt":"2019-10-31T19:02:35","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-8-opticheskaya-magistralnaya-set","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-8-opticheskaya-magistralnaya-set","title":{"rendered":"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline kiudkaabelsidev\u00f5rk","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline kiudkaabelsidev\u00f5rk\" src=\"\/wp-content\/uploads\/1c4d747d25a95ae994d82fbd59e116a0.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAastate jooksul on andmete edastamise aluseks olnud optiline meedia. On raske ette kujutada hobi kirjutajat, kes ei tunneks neid tehnoloogiaid, kuid ilma v\u00e4hemalt l\u00fchikese kirjeldusega ei saa minu artiklite sarjas hakkama.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Artiklisarja sisu<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Osa 1: \u00dcldine KTV v\u00f5rgu arhitektuur<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Osa 2: Signaali koostis ja kuju<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Osa 3: Analoogne signaalikomponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Osa 4: Digitaalne signaalikomponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">Osa 5: Koaksiaalne jaotusv\u00f5rk<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450452\/\">Osa 6: RF-signaalide v\u00f5imendid<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/454542\/\">Osa 7: Optilised vastuv\u00f5tjad<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455355\/\">Osa 8: Optiline peav\u00f5rk<\/a><\/noindex><\/li>\n<li>Osa 9: Peajaam<\/li>\n<li>Osa 10: Veaotsing ja t\u00f5rkeotsing KTV v\u00f5rgus<\/li>\n<\/ul>\n<p>\nKuna pilt oleks puudulik, r\u00e4\u00e4gin lihtsalt paarist elementaarsest asjast (palun \u00e4rge visake kingi, see on neile, kes ei tea midagi): optiline kiud on klaas, mis on venitatud niidiks, mis on \u00f5hem kui juuksekarv. Selle kaudu levib laseri moodustatud kiir, mis (nagu iga elektromagnetlaine) omab oma kindlat sagedust. Mugavuse ja lihtsuse huvides r\u00e4\u00e4gime optikast, kasutades sageduse asemel vastupidist v\u00e4\u00e4rtust lainepikkust, mida optilises vahemikus m\u00f5\u00f5detakse nanometrites. Kaabeltelevisiooni signaalide edastamiseks kasutatakse tavaliselt \u03bb=1550nm.<\/p>\n<p>Maanteed \u00fchendatakse omavahel keevituse v\u00f5i liitmikute abil. Selle kohta saab l\u00e4hemalt lugeda <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/193146\/\">suurep\u00e4rasest artiklist @stalinets<\/a><\/noindex>. \u00dctlen vaid, et KTV v\u00f5rkudes kasutatakse peaaegu alati kallutatud APC poleerimist. <\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline kiudkaabelsidev\u00f5rk\" src=\"\/wp-content\/uploads\/5d3dadf9f154a8a937721a5547df78c6.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Pilt saidilt fiber-optic-solutions.com<\/i><\/p>\n<p>See toob kaasa veidi rohkem kadu, kui sirge, kuid omab v\u00e4ga olulist omadust: ristmikul kajastatud signaal ei levi samas telges, mis p\u00f5hisisignaal, t\u00e4nu millele avaldab see sellele v\u00e4hem m\u00f5ju. Digitaalsetes edastus s\u00fcsteemides, millel on liigse teabe ja taastamismetoodikatega, ei tundu see t\u00e4htis, kuid telesignaal alustas oma teed analoogina (sealhulgas optilises kiu puhul), ja selle jaoks on see v\u00e4ga kriitiline: k\u00f5ik m\u00e4letavad, kuidas vanadel teleritel pilt tuimaks l\u00e4heb v\u00f5i libiseb, kui vastuv\u00f5tt on ebamugav. Sarnased laine n\u00e4htused esinevad nii \u00f5hus kui ka juhtmetes. Kuigi digitaalne telesignaal on k\u00f5rgendatud m\u00fcra vastupidavusega, pole sel siiski palju pakettandmete edastamise eeliseid ning see v\u00f5ib samuti kannatada f\u00fc\u00fcsilisel tasemel, kuid seda ei saa enam taastada l\u00e4bi uuesti k\u00fcsitamise.<\/p>\n<p>Selleks, et signaali saaks edastada suurel kaugusel, on vajalik k\u00f5rge tase, seet\u00f5ttu ei saa kettas ilma v\u00f5imenditeta l\u00e4bi tulla. Optilist signaali KTV s\u00fcsteemides v\u00f5imendavad erbiumi v\u00f5imendid (EDFA). Selle seadme t\u00f6\u00f6 v\u00f5ib olla suurep\u00e4rane n\u00e4ide sellest, et igasugune piisavalt arenenud tehnoloogia ei eristu v\u00f5ludest. Kui l\u00fchidalt \u00f6elda: kui kiir liigub erbiami lisandiga kiududes, luuakse tingimused, kus iga algse kiirguse foton loob kaks oma klooni. Selliseid seadmeid kasutatakse k\u00f5igis andmeedastuss\u00fcsteemides, mis katab suuri vahemaid. Nad ei ole muidugi odavad. Seet\u00f5ttu, kui signaali oluliseks v\u00f5imendamiseks ei ole vajadust ja pole rangeid n\u00f5udeid m\u00fcra koguse osas, kasutatakse signaalide regeneraatoreid:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline kiudkaabelsidev\u00f5rk\" src=\"\/wp-content\/uploads\/629f8aa97d6a0a00ceb8b044d5bdc033.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSee seade, nagu n\u00e4ha struktuursest schema's, teostab signaali kahetasandilist muundamist optilise ja elektrilise keskkonna vahel. Selline konstruktsioon v\u00f5imaldab vajadusel muuta signaali lainepikkust.<\/p>\n<p>Sellised toimingud nagu signaali v\u00f5imendamine ja regeneratsioon on vajalikud mitte ainult kaabli kilomeetri paigaldage kaotuse kompenseerimiseks. Suuremad kadud tekivad signaali jagamise t\u00f5ttu v\u00f5rgu harudes. Jagamine toimub passiivsete seadmete abil, millel vastavalt vajadusele v\u00f5ib olla erinev arv v\u00e4ljalaskeavad ja samuti saada signaali jagada nii s\u00fcmmeetriliselt kui ka as\u00fcmmeetriliselt.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline kiudkaabelsidev\u00f5rk\" src=\"\/wp-content\/uploads\/e1b3b0cc2513d8ae8377090a4410d67d.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSeestpoolt on jagaja kas kiud, mis on \u00fchendatud k\u00fclgpindadega, v\u00f5i graveeritud, nagu j\u00e4ljed tr\u00fckkplaadil. S\u00fcvendi jaoks soovitan artikleid <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/nagru\/\" class=\"user_link\">NAGru<\/a><\/noindex> kohta <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nag\/blog\/408963\/\">keevitatud<\/a><\/noindex> ja <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/nag\/blog\/371203\/\">planar<\/a><\/noindex> jagajad vastavalt. Mida rohkem on jagajal v\u00e4ljalaskeavasid, seda suurem on signaali kadumine.<\/p>\n<p>Kui lisame jagajale filtrid, et lahutada erineva lainepikkusega kiiri, saame edastada kohe kaks signaali \u00fches kiudus.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 8: Optiline kiudkaabelsidev\u00f5rk\" src=\"\/wp-content\/uploads\/8532a92e861978723ce0a7bb0906346b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSee the simplest option for multiplexing on optics \u2014 FWDM. By connecting the KTV equipment to the TV and Express inputs for TV and internet respectively, we obtain a mixed signal in the common COM output, which can be transmitted over a single fiber. On the other side, it can similarly be split between an optical receiver and a switch, for example. This happens much like in a glass prism, where a rainbow emerges from white light.<\/p>\n<p>To ensure the redundancy of the optical signal, in addition to optical receivers with two inputs, which I mentioned earlier, <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/454542\/\">in the previous part<\/a><\/noindex> an electromechanical relay can be used, which can switch from one source to another based on defined signal parameters.<br \/>\nIn the event of degradation of one fiber, the device will automatically switch to another. The switching time is less than a second, making it appear to the subscriber, at worst, as a burst of artifacts on the digital video feed, which disappear with the next frame.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455355\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e\u0442 \u0443\u0436\u0435 \u043c\u043d\u043e\u0433\u043e \u043b\u0435\u0442 \u043e\u0441\u043d\u043e\u0432\u043e\u0439 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0441\u0440\u0435\u0434\u0430. \u0421\u043b\u043e\u0436\u043d\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0445\u0430\u0431\u0440\u0430\u0447\u0438\u0442\u0430\u0442\u0435\u043b\u044f, \u043d\u0435 \u0437\u043d\u0430\u043a\u043e\u043c\u043e\u0433\u043e \u0441 \u044d\u0442\u0438\u043c\u0438 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u044f\u043c\u0438, \u043e\u0434\u043d\u0430\u043a\u043e \u0431\u0435\u0437 \u0445\u043e\u0442\u044f \u0431\u044b \u043a\u0440\u0430\u0442\u043a\u043e\u0433\u043e \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u044f \u043e\u0431\u043e\u0439\u0442\u0438\u0441\u044c \u0432 \u043c\u043e\u0435\u0439 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e. \u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u0427\u0430\u0441\u0442\u044c 1: \u041e\u0431\u0449\u0430\u044f \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0430 \u0441\u0435\u0442\u0438 \u041a\u0422\u0412 \u0427\u0430\u0441\u0442\u044c 2: \u0421\u043e\u0441\u0442\u0430\u0432 \u0438 \u0444\u043e\u0440\u043c\u0430 \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 3: \u0410\u043d\u0430\u043b\u043e\u0433\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 4: \u0426\u0438\u0444\u0440\u043e\u0432\u0430\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0430\u044f \u0441\u0438\u0433\u043d\u0430\u043b\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-35148","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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