{"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\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-7-opticheskie-priyomniki","title":{"rendered":"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/584ee7cc84df80ab2b060e30286e5b2a.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOptilise keskkonna ja koaksiaalkaabli piir 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\">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>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\u00f5rkeotsing KTV v\u00f5rgus<\/li>\n<\/ul>\n<p>\nOptilise vastuv\u00f5tja \u00fclesanne on edastada signaal optilisest keskkonnast elektriliseks. K\u00f5ige lihtsamal kujul saab seda teha passiivse seadme abil, mis paistab silma oma lihtsuse poolest:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. 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 kesiseid signaaliparameetreid: optilise signaali tasemel -1 \u2014 -2 dBm on v\u00e4ljundparameetrid vaevu normi piires, samas kui signaali \u00fclem\u00e4\u00e4rane t\u00f5stmine toob kaasa m\u00e4rkimisv\u00e4\u00e4rse m\u00fcra suurenemise.<\/p>\n<p>Kvaliteetse signaali tagamiseks FTTB arhitektuuris tuleb kasutada keerukamaid seadmeid:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/a39ede72e21499c856667d0b2b280969.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMeie v\u00f5rgus esinevad vastuv\u00f5tjad: Vector Lambda, Telmor MOB ja kodumaine Planar.<\/p>\n<p>K\u00f5ik need erinevad oma passiivsest nooremast vennast keerukama skeemitehnika poolest, mis sisaldab filtreid ja tugevdajaid, t\u00e4nu millele v\u00f5ib olla rahulik signaali kohta, mis j\u00f5uab tellijani. Vaatame neid l\u00e4hemalt:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/1a899e7150b65ff76e73208946ae2156.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOptilised vastuv\u00f5tjad Telmoril on sees panel, millel on esitatud struktuurskeem. Selline skeem on O\u00dc-de seas t\u00fc\u00fcpiline.<\/p>\n<p>N\u00f5utav optilise signaali tase on tavaliselt vahemikus -10 kuni +3 dBm, projekteerimisel ja seadistamisel on optimaalseks v\u00e4\u00e4rtuseks -1 dBm: see annab m\u00f5istliku varu edastusliini degradatsiooni korral ja samas madal tase loob seadmete ahelas v\u00e4hem m\u00fcra.<\/p>\n<p>Optilisse vastuv\u00f5tjasse sisseehitatud APU (AGC) skeem teeb just seda, et regulaarselt sisenenud signaali taset reguleerides hoiab v\u00e4ljundit m\u00e4\u00e4ratud parameetrites. See t\u00e4hendab, et kui mingil p\u00f5hjusel optiline signaal \u00e4kki m\u00e4rgatavalt muutub, kuid j\u00e4\u00e4b APU t\u00f6\u00f6range (umbes 0 kuni -7 dBm) piiresse, siis vastuv\u00f5tja saadab koaksiaalv\u00f5rku signaali selle tasemega, mis oli seadistamisel m\u00e4\u00e4ratud. Eriliste juhtumite jaoks eksisteerivad seadmed kahe optilise sisendiga, millest iga\u00fcht j\u00e4lgitakse ja saab kasutada nii k\u00e4sitsi kui automaatselt.<\/p>\n<p>K\u00f5ik aktiivsed OP-d sisaldavad endas v\u00f5imendi kaskaadi, mis samuti v\u00f5imaldab reguleerida kaldenurka ja v\u00e4ljundsignaali taset.<\/p>\n<h1>Optiliste vastuv\u00f5tjate haldamine<\/h1>\n<p>\nSignaaliparametreid seadistamiseks ja sisseehitatud teenusfunktsioonide muutmiseks ja kontrollimiseks on tavaliselt olemas lihtsad juhtseadmed. \u00dclaltoodud pildil olev MOB-l on eraldi plaat, mis paigaldatakse korpusesse valikuliselt. Alternatiivina pakutakse v\u00f5imalust kasutada kiiresti eemaldatavat plaati, mis paigaldatakse ainult seadistamise ajaks p\u00f5hiplati portidesse. Praktikas ei ole see muidugi eriti mugav.<\/p>\n<p>Juhtpaneel v\u00f5imaldab seadistada sisendi atenuatori v\u00e4\u00e4rtusi (mida suurendades v\u00e4heneb v\u00e4ljundsignaal vastavalt v\u00f5imenduskorrale), l\u00fclitada sisse v\u00f5i v\u00e4lja (ning seadistada fikseeritud v\u00e4\u00e4rtusi) ARU-d, seadistada kaldenurk ja konfigureerida etherneti liidest.<\/p>\n<p>T\u0161eljabinski OP Planaril on arusaadav optilise signaali taseme n\u00e4idik, ning seadistamine toimub lihtsalt: ratta ja vahetatavate lisade abil, mis muudetavad v\u00f5imendi kaskaadi omadusi. Klapi all olevas katteosas asub toiteplokk.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/9c0873567e055c0292484b3f71ed9f26.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTehnopornograafiat kujundatud OP Vector Lambda-l on kahe kohaleline ekraan ja ainult kolm nuppu.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/ee9f491e8d40db7a66573189429b0fd2.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPositiivsete v\u00e4\u00e4rtuste eristamiseks negatiivsetest n\u00e4itab see OP negatiivset v\u00e4\u00e4rtust k\u00f5iki segmente kasutades, samas kui positiivset nulli ja +1 n\u00e4itab ekraani poole k\u00f5rgusega. Kui v\u00e4\u00e4rtused \u00fcletavad +1,9, siis kuvatakse lihtsalt \"HI.\"<\/p>\n<p>Sellised juhtseadmed on mugavad objektil kohapeal reguleerimiseks, kuid peaaegu k\u00f5igil vastuv\u00f5tjatel on kaugseire ja juhtimise v\u00f5imaldamiseks etherneti port. Veebiliides v\u00f5imaldab kontrollida ja muuta parameetreid ning s\u00fcsteemiga integreerimiseks toetab SNMP l\u00e4bik\u00fcsimist.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. 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\u00f5imalik k\u00fclgnegatiivse ja atenuatori parameetrite muutmine. Kuid selle OP kaldenurk on seadistatud ainult plaatide h\u00fcppajatega ja tal on kolm fikseeritud asendit.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/0b8f2ccc0529f472a5a7721c3cc958ce.JPG\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Oluline kontrollida parameetreid, mis kuvatakse diagrammi k\u00f5rval: sisendi ja v\u00e4ljundi signaalitasemed ning integreeritud toiteplokist saadud pinged. 99% antud seadmete rikete juhtudest esineb pingete halvenemise j\u00e4rel, seega tasub neid j\u00e4lgida, et v\u00e4ltida \u00f5nnetusi.<\/p>\n<p>S\u00f5na Transponder all m\u00f5eldakse siin IP-intervjuvenit, ja see vahekaart sisaldab aadressi, maski ja v\u00e4rava seadeid \u2014 mitte midagi huvitavat.<\/p>\n<h1>Boonus: \u00f5hust TV vastuv\u00f5tt<\/h1>\n<p>\nSee ei puuduta selle seeria teemat, kuid jagan l\u00fchidalt \u00f5hust TV vastuv\u00f5tmise kohta. Miks just n\u00fc\u00fcd? Ausalt \u00f6eldes, kui vaadata korterelamu v\u00f5rku, s\u00f5ltub just signaali allikast koaksiaaljaotuse kaudu, kas v\u00f5rk on kaabel- v\u00f5i \u00f5hust. <\/p>\n<p>Kui optilist kiudu signaali ei ole, v\u00f5ib asemel kasutada \u00f5hu vastuv\u00f5tjat, n\u00e4iteks Terra MA201:<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/f35f28a1c7813f0a13ac883472bc34e2.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVastuv\u00f5tja sisendportidesse \u00fchendatakse mitu antenni (tavaliselt kolm), millest iga\u00fcks pakub oma sagedusala vastuv\u00f5ttu.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. Osa 7: Optilised vastuv\u00f5tjad\" src=\"\/wp-content\/uploads\/2019\/06\/240704544381b0cb45201ae229c3cb09.JPG\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<code>Tegelikult, digitaaltelevisioonile \u00fcleminekul kaob selle vajadus, kuna digitaalsed multiplexed edastatakse \u00fches sagedusala.<\/code><\/p>\n<p>Iga antenni jaoks saab seadistada tundlikkuse m\u00fcrataseme v\u00e4hendamiseks ning vajadusel toita kaugtoidet integreeritule antenni v\u00f5imendile. Seej\u00e4rel signaal l\u00e4bib v\u00f5imenduskaskaadi ja summeeritakse. V\u00e4ljundtaseme reguleerimise v\u00f5imalus piirdub kaskaadi astmete katkestamisega, kuid kalde reguleerimist ei ole ette n\u00e4htud: soovitud spektri kuju saab saavutada igas antennis eraldi tundlikkuse reguleerimisega. Ja kui sellise vastuv\u00f5tja taga on kilomeetreid koaksiaalkaablit, siis sealsete kadude \u00fcletamiseks kasutatakse v\u00f5imendite paigaldamist ja seadistamist, sarnastele, nagu kaabelv\u00f5rgus.<\/p>\n<p>Soovi korral saab signaaliallikad kombineerida: \u00fchendada \u00fchte v\u00f5rku nii kaabel-, \u00f5hu- kui ka satelliitsignaal. Seda tehakse multiswitchide abil \u2014 seadmed, mis v\u00f5imaldavad erinevate allikate signaale summeerida ja jaotada.<\/p>\n<p><img decoding=\"async\" alt=\"Kaabeltelevisiooni v\u00f5rgud v\u00e4ikestele. 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-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - 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