{"id":34904,"date":"2019-10-31T22:01:10","date_gmt":"2019-10-31T19:01:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-7-opticheskie-priyomniki\/"},"modified":"2019-10-31T22:01:10","modified_gmt":"2019-10-31T19:01:10","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-7-opticheskie-priyomniki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-7-opticheskie-priyomniki","title":{"rendered":"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/584ee7cc84df80ab2b060e30286e5b2a.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPiir optilise mediumi ja koaksiaalkaabli vahel on optiline vastuv\u00f5tja. Selles artiklis vaatleme nende konstruktsiooni ja seadistusi.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Artiklite seeria sisu<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Osa 1: Kaabli-TV v\u00f5rgu \u00fcldine arhitektuur<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Osa 2: Signaali koostis ja vorm<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Osa 3: Signaali analoogne komponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Osa 4: Signaali digitaalne komponent<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">Osa 5: Koaksiaalne jaotamisv\u00f5rk<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450452\/\">Osa 6: RF-signaali v\u00f5imendid<\/a><\/noindex><\/li>\n<li>Osa 7: Optilised vastuv\u00f5tjad<\/li>\n<li>Osa 8: Optiline peav\u00f5rk<\/li>\n<li>Osa 9: Peajaam<\/li>\n<li>Osa 10: Veaotsing ja t\u00f5rgete k\u00f5rvaldamine kaabli-TV v\u00f5rgus<\/li>\n<\/ul>\n<p>\nOptilise vastuv\u00f5tja \u00fclesanne on signaali edastamine optilisest keskkonnast elektrilisse. K\u00f5ige lihtsamal kujul saab seda teha passiivse seadmega, mis paistab silma oma lihtsuse t\u00f5ttu:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/5f137917cad905f73f5be394bca7743c.JPG\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Kuid see inseneriteos tagab \u00fcsna keskp\u00e4rased signaaliparameetrid: kui optilise signaali tase on -1 \u2014 -2 dBm, siis v\u00e4ljundparameetrid vaevu vastavad standardile, ja signaali liigsel t\u00f5stmisel suureneb oluliselt m\u00fcra.<\/p>\n<p>Kvaliteedi kindlustamiseks FTTB arhitektuuris tuleb kasutada keerukamaid seadmeid:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/a39ede72e21499c856667d0b2b280969.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVastuv\u00f5tjad, mida meie v\u00f5rgus kohtame: Vector Lambda, Telmor MOB ja kodumaine Planar.<\/p>\n<p>K\u00f5ik nad erinevad oma passiivsest nooremast kolleegist keerukama skeemitehnika poolest, mis sisaldab filtreid ja v\u00f5imendajaid, t\u00e4nu millele saab olla kindel, et signaal j\u00f5uab abonendini. Vaatleme neid l\u00e4hemalt:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/1a899e7150b65ff76e73208946ae2156.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTelmor optiline vastuv\u00f5tja sees on paneel struktuurskeemaga. Selline skeem on t\u00fc\u00fcpiline O\u041f jaoks.<\/p>\n<p>N\u00f5utav optilise signaali tase on tavaliselt -10 kuni +3 dBm, projekteerimisel ja seadistamisel on optimaalseks v\u00e4\u00e4rtuseks -1 dBm: see on korralik varu edastusliini degradeerumise juhtudel ning samas madalam tase tekitab seadmete ahelas v\u00e4hem m\u00fcra.<\/p>\n<p>Optilise vastuv\u00f5tja sisse ehitatud Auru (AGC) skeem hoolitseb selle eest, et reguleerides sisendsignaali taset hoiab v\u00e4ljundiga etten\u00e4htud parameetrites. See t\u00e4hendab, et kui mingil p\u00f5hjusel optiline signaal oluliselt muutub, kuid j\u00e4\u00e4b AURU t\u00f6\u00f6vahemikku (umbes 0 kuni -7 dBm), siis vastuv\u00f5tja edastab koaksiaalv\u00f5rku signaali taseme, mis oli seadistamisel m\u00e4\u00e4ratud. Eriti oluliste juhtumite jaoks on olemas seadmed, millel on kaks optilist sissetulekut, millest iga\u00fcht j\u00e4lgitakse ja saab kasutada nii k\u00e4sitsi kui ka automaatselt.<\/p>\n<p>K\u00f5ik aktiivsed OP-d sisaldavad v\u00f5imenduskaskaadi, mis samuti v\u00f5imaldab reguleerida kaldenurka ja v\u00e4ljundsignaali taset.<\/p>\n<h1>Optiliste vastuv\u00f5tjate juhtimine<\/h1>\n<p>\nSignaaliparameetrite seadistamiseks ning sisseehitatud teenusfunktsioonide muutmiseks ja kontrollimiseks on vastuv\u00f5tjates tavaliselt olemas lihtsad juhtimisorganid. \u00dclaloleval pildil oleva MOB-i puhul on see eraldi sagedusala, mis paigaldatakse korpusesse valikuliselt. Alternatiivina pakutakse v\u00e4lja ka kiirelt eemaldatavat plaati, mis installitakse vaid seadistamise ajaks p\u00f5hiplekkide portidesse. Praktiliselt pole see muidugi eriti mugav.<\/p>\n<p>Juhtpaneel v\u00f5imaldab seadistada sisendi attenuatsiooni v\u00e4\u00e4rtusi (mille suurenemise puhul v\u00e4heneb v\u00e4ljundsignaal vastavalt v\u00f5imendustegurile), l\u00fclitada sisse v\u00f5i v\u00e4lja (ja samuti seadistada fikseeritud v\u00e4\u00e4rtusi) A\u0420\u0423, seadistada kaldenurga parameetreid ja konfigureerida etherneti liidest.<\/p>\n<p>T\u0161eljabinski OP Planaril on selge optilise signaali taseme indikaator ning seadistused toimuvad lihtsalt: k\u00e4epideme ja vahetatavate sisendite abil, mis muudavad v\u00f5imendi omadusi. Ava kaanel asub toiteplokk.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/9c0873567e055c0292484b3f71ed9f26.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTehnopornograafia disainis OP Vector Lambda-l on kahekohaline ekraan ja vaid kolm nuppu.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/ee9f491e8d40db7a66573189429b0fd2.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEt eristada positiivseid v\u00e4\u00e4rtusi negatiivsetest, kuvab see OP negatiivsed v\u00e4\u00e4rtused k\u00f5igi segmentidega ning positiivset nulli ja +1 n\u00e4itab ekraanipinna poole k\u00f5rgusega. V\u00e4\u00e4rtustel, mis \u00fcletavad +1,9, kirjutab see lihtsalt 'HI'.<\/p>\n<p>Sellised juhtimisseadmikud on mugavad objektil kiireks seadistamiseks, kuid praktiliselt k\u00f5igil vastuv\u00f5tjatel on kaugmonitorimiseks ja juhtimiseks Etherneti port. Veebiliides v\u00f5imaldab j\u00e4lgida ja muuta parameetreid ning integreerimiseks j\u00e4lgimiss\u00fcsteemidega toetatakse SNMP k\u00fcsitlusi.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/bd6d6b70f246cbd3355a53f6f28b0fe5.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiin n\u00e4eme sama t\u00fc\u00fcpilist OP struktuurskeemi, millel on v\u00f5imalus muuta A\u0420\u0423 ja atenuatsiooni parameetreid. Kuid selle OP kalle seatakse ainult plaadi jumperitega ja sellel on kolm fikseeritud positsiooni.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/0b8f2ccc0529f472a5a7721c3cc958ce.JPG\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Olulisemad kontrolliparameetrid, nagu sisend- ja v\u00e4ljundsignaalide tasemed ning integreeritud toiteploki saadud pinge v\u00e4\u00e4rtused, kuvatakse diagrammi k\u00f5rval. 99% selliste OPS-i v\u00e4ljunditest juhtub p\u00e4rast nende pingete halvenemist, seet\u00f5ttu tasub neid j\u00e4lgida, et v\u00e4ltida avariisid.<\/p>\n<p>S\u00f5na Transponder all m\u00f5eldakse siin IP-liidest, ning see sakk sisaldab aadressi, maski ja vaikimisi v\u00e4rava seadeid - mitte midagi huvitavat.<\/p>\n<h1>Boonus: \u00f5huteleviisori vastuv\u00f5tt<\/h1>\n<p>\nSee ei ole seeria teema, kuid r\u00e4\u00e4gin paarist s\u00f5nast \u00f5huteleviisori vastuv\u00f5tust. Miks just n\u00fc\u00fcd? Lihtsalt, kui vaadata korterelamu v\u00f5rku, s\u00f5ltub see, kas v\u00f5rk on kaabel- v\u00f5i \u00f5hust, signaaliallika koaksiaaljaotuss\u00fcsteemist. <\/p>\n<p>Kui kiudkaabli signaali puudub, v\u00f5ib OPS asemel paigaldada \u00f5hu edastamise vastuv\u00f5tja, n\u00e4iteks Terra MA201:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/f35f28a1c7813f0a13ac883472bc34e2.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVastuv\u00f5tja sisendportsidesse \u00fchendatakse mitu antenni (tavaliselt kolm), millest iga\u00fcks tagab oma sagedusala vastuv\u00f5tu.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/240704544381b0cb45201ae229c3cb09.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<code>T\u00f5epoolest, digitaalse televisiooni realiseerimisega kaob see vajadus, kuna digitaalsed multiplexid edastatakse \u00fches ribas.<\/code><\/p>\n<p>Iga antenni puhul on v\u00f5imalik seadistada tundlikkust m\u00fcra v\u00e4hendamiseks ning vajaduse korral toita kaugjuhitav toide antennis oleva v\u00f5imendi jaoks. Edasi l\u00e4bib signaal v\u00f5imenduskaskaadi ja summeeritakse. V\u00e4ljundtaseme reguleerimise v\u00f5imalus piirneb etappide v\u00e4lja l\u00fclitamisega, samas kui kalde reguleerimine pole \u00fcldse ette n\u00e4htud: soovitud spektri kuju saab saavutada iga antenni tundlikkuse individuaalsete seadistustega. Kui sellise vastuv\u00f5tja taga on kilomeetreid koaksiaalset kaablit, siis tegeletakse selle kaotuse leevendamisega v\u00f5imendite paigaldamise ja seadistamisega, mis on samad nagu kaabelv\u00f5rgus.<\/p>\n<p>Soovi korral on v\u00f5imalik kombineerida signaaliallikad: \u00fchendada \u00fcheks v\u00f5rguks nii kaabel- kui ka \u00f5husaade ning lisaks ka satelliitsignaal. Seda tehakse multiswitchide abil \u2014 seadmed, mis v\u00f5imaldavad erinevate allikate signaale summeerida ja jagada.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooniv\u00f5rgud k\u00f5ige v\u00e4iksematele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/1cecfac52fdf6c4ea6852a64f7b404a1.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/454542\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0430\u043d\u0438\u0446\u0430 \u043c\u0435\u0436\u0434\u0443 \u043e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0441\u0440\u0435\u0434\u043e\u0439 \u0438 \u043a\u043e\u0430\u043a\u0441\u0438\u0430\u043b\u044c\u043d\u044b\u043c \u043a\u0430\u0431\u0435\u043b\u0435\u043c \u2014 \u043e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043f\u0440\u0438\u0451\u043c\u043d\u0438\u043a. \u0412 \u044d\u0442\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0438\u0445 \u043a\u043e\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044e \u0438 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0438. \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 \u0427\u0430\u0441\u0442\u044c 5: \u041a\u043e\u0430\u043a\u0441\u0438\u0430\u043b\u044c\u043d\u0430\u044f \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u0430\u044f \u0441\u0435\u0442\u044c \u0427\u0430\u0441\u0442\u044c 6: \u0423\u0441\u0438\u043b\u0438\u0442\u0435\u043b\u0438 RF-\u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u0427\u0430\u0441\u0442\u044c 7: \u041e\u043f\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":26277,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-34904","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" 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