{"id":32308,"date":"2019-10-31T21:46:16","date_gmt":"2019-10-31T18:46:16","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-1-obshhaya-arhitektura-seti-ktv\/"},"modified":"2019-10-31T21:46:16","modified_gmt":"2019-10-31T18:46:16","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-1-obshhaya-arhitektura-seti-ktv","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-1-obshhaya-arhitektura-seti-ktv","title":{"rendered":"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/1d0b5616b4d48429ff1130f6a7ddd519.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIndiferent de c\u00e2t de mult comunitatea educat\u0103 critic\u0103 televizorul pentru influen\u021ba sa negativ\u0103 asupra con\u0219tiin\u021bei, semnalul televizional este prezent practic \u00een toate locuin\u021bele (\u0219i \u00een multe spa\u021bii comerciale). \u00cen ora\u0219ele mari, acesta este aproape \u00eentotdeauna televiziune prin cablu, chiar dac\u0103 toat\u0103 lumea din jur o nume\u0219te de obicei \u201eantena\u201d. \u0218i dac\u0103 sistemul de recep\u021bie pentru televiziunea terestr\u0103 este destul de evident (de\u0219i poate diferi de antena tradi\u021bional\u0103 cu form\u0103 de U de pe pervaz, despre care voi vorbi \u00een detaliu mai t\u00e2rziu), sistemul de televiziune prin cablu poate p\u0103rea nea\u0219teptat de complex \u00een ceea ce prive\u0219te func\u021bionarea \u0219i arhitectura. Despre aceasta voi prezenta o serie de articole. Vreau s\u0103 familiarizez pe cei interesa\u021bi cu principiile de func\u021bionare a re\u021belelor de televiziune prin cablu, precum \u0219i cu exploatarea \u0219i diagnosticul acestora.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<ul>\n<li>Partea 1: Arhitectura general\u0103 a re\u021belei CATV<\/li>\n<li>Partea 2: Compozi\u021bia \u0219i forma semnalului<\/li>\n<li>Partea 3: Componenta analogic\u0103 a semnalului<\/li>\n<li>Partea 4: Componenta digital\u0103 a semnalului<\/li>\n<li>Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103<\/li>\n<li>Partea 6: Amplificatoarele de semnal RF<\/li>\n<li>Partea 7: Recep\u021bionerele optice<\/li>\n<li>Partea 8: Re\u021beaua optic\u0103 magistral\u0103<\/li>\n<li>Partea 9: Sta\u021bia de cap<\/li>\n<li>Partea 10: Diagnosticul \u0219i repararea re\u021belei CATV<\/li>\n<\/ul>\n<p>\nNu pretind c\u0103 scriu un manual cuprinz\u0103tor, ci voi \u00eencerca s\u0103 r\u0103m\u00e2n \u00een limitele populariz\u0103rii \u0219tiin\u021bifice \u0219i s\u0103 nu aglomerez articolele cu formule \u0219i descrieri tehnologice. Tocmai din acest motiv am l\u0103sat \u00een text cuvinte \u201einteligente\u201d f\u0103r\u0103 explica\u021bii, c\u0103ut\u00e2ndu-le pe Google ve\u021bi putea s\u0103 v\u0103 aprofunda\u021bi \u00een m\u0103sura \u00een care este necesar pentru voi. C\u0103ci, fiecare \u00een parte este bine descris, iar eu voi explica doar cum se combin\u0103 toate acestea \u00eentr-un sistem de televiziune prin cablu. \u00cen prima parte, voi descrie pe scurt structura re\u021belei, iar mai t\u00e2rziu voi analiza \u00een detaliu principiile \u00eentregii sisteme.<\/p>\n<p>Re\u021beaua de televiziune prin cablu are o structur\u0103 arboricol\u0103. Semnalul este generat de sta\u021bia principal\u0103, care adun\u0103 semnalele din diferite surse, le combin\u0103 \u00eentr-un singur semnal (conform unui plan de frecven\u021b\u0103 stabilit) \u0219i le transmite \u00een re\u021beaua de distribu\u021bie principal\u0103 \u00een forma necesar\u0103. \u00cen prezent, re\u021beaua principal\u0103 este, desigur, optic\u0103, iar semnalul trece \u00een cablul coaxial doar \u00een interiorul cl\u0103dirii finale.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/37edbbd7285262255690695d8e7fa5ce.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h1>Sta\u021bia principal\u0103<\/h1>\n<p>\nSursele de semnal pentru sta\u021bia principal\u0103 pot fi at\u00e2t antene prin satelit (care pot fi zeci), c\u00e2t \u0219i fluxuri digitale transmise direct de canalele de televiziune sau de al\u021bi operatori de telecomunica\u021bii. Pentru recep\u021bia \u0219i colectarea semnalului din diferite surse se utilizeaz\u0103 decodoare\/modulatoare multi-canal multi-servicii, care constau dintr-un \u0219asiu montat \u00een rack cu diverse module de extensie, care asigur\u0103 conectarea diferitelor interfe\u021be, precum \u0219i decodificarea, modula\u021bia \u0219i generarea semnalului necesar. <\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/c06a1127de73e1f8c4baf6f67388c3d7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Aici, de exemplu, vedem 6 module de primire a semnalului de televiziune prin satelit \u0219i dou\u0103 modulatoare de ie\u0219ire DVB-C.<\/i><\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/6d2da0e5dc7a105e8bcac2498928870a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Iar acest chassis se ocup\u0103 cu decriptarea semnalului. Se pot observa modulele CAM, acelea\u0219i care se introduc \u00een televizoare pentru recep\u021bia canalelor criptate.<\/i><\/p>\n<p>Rezultatul activit\u0103\u021bii acestui echipament este semnalul de ie\u0219ire, care con\u021bine toate canalele pe care le vom livra abona\u021bilor, distribuite pe frecven\u021be \u00een conformitate cu planul de frecven\u021be prestabilit. \u00cen re\u021beaua noastr\u0103, acest interval variaz\u0103 de la 49 la 855 MHz, incluz\u00e2nd at\u00e2t canale analogice, c\u00e2t \u0219i digitale \u00een formatele DVB-C, DVB-T \u0219i DVB-T2:<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/c38ced0832fe7d7a277d60171995cf87.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Afi\u0219area spectrului semnalului.<\/i><\/p>\n<p>Semnalul format este livrat la transmi\u021b\u0103torul optic, care este, de fapt, un convertor de mediu \u0219i transport\u0103 canalele noastre \u00een mediul optic pe lungimea de und\u0103 tradi\u021bional\u0103 de 1550nm pentru televiziune.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/1fabae514f2402917cc033f437d56d36.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Transmi\u021b\u0103tor optic.<\/i><\/p>\n<h1>Re\u021bea de distribu\u021bie magistral\u0103<\/h1>\n<p>\nSemnalul optic ob\u021binut de la sta\u021bia principal\u0103 este amplificat cu ajutorul cunoscutului amplificator optic pe baz\u0103 de erbiu (EDFA).<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/5a60d6c0ac5c5ab369eeec05fbdfb8e5.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSemnalele ridicate de la ie\u0219irea amplificatorului, cu un nivel de c\u00e2teva zeci de dBm, pot fi deja \u00eemp\u0103r\u021bite \u0219i trimise \u00een diferite zone. \u00cemp\u0103r\u021birea se face prin divizoare pasive, care sunt plasate, pentru comoditate, \u00een carcasele de cross-uri de rack.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/01c767a0760c1764ea0ae8e94b888e41.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Divizor optic \u00een cadrul unui cross optic de un unitate.<\/i><\/p>\n<p>Semnalul \u00eemp\u0103r\u021bit ajunge la obiecte, unde poate fi, dac\u0103 este necesar, amplificat cu ajutorul acelora\u0219i amplificatoare, sau \u00eemp\u0103r\u021bit \u00eentre alte echipamente.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/56dad363be688d3d175f62dfcf61bdf7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA\u0219a ar putea ar\u0103ta un nod al unui cartier reziden\u021bial. Acesta include un amplificator optic, un divizor de semnal \u00eentr-o carcas\u0103 de cross de rack \u0219i un cross optic de distribu\u021bie, de unde fibrele se \u00eendreapt\u0103 spre recep\u021bionerele optice.<\/p>\n<h1>Re\u021bea de distribu\u021bie pentru abona\u021bi<\/h1>\n<p>\nRecep\u021bionere optice, asemenea transmi\u021b\u0103torului, reprezint\u0103 convertori de mediu: acestea transport\u0103 semnalul optic primit c\u0103tre cablul coaxial. Recep\u021bionerele optice pot fi diferite \u0219i de la diferi\u021bi produc\u0103tori, dar func\u021bionalitatea lor este, \u00een general, aceea\u0219i: monitorizarea nivelurilor \u0219i reglaje de baz\u0103 ale semnalului, despre care voi vorbi \u00een detaliu \u00een articolele urm\u0103toare.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/7ad3b7f20cf7161ced23e7cd0b4a5dbc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Recep\u021bionere optice utilizate \u00een re\u021beaua noastr\u0103.<\/i><\/p>\n<p>\u00cen func\u021bie de arhitectura cl\u0103dirilor (num\u0103rul de etaje, num\u0103rul de corpuri \u0219i intr\u0103ri etc.), receptorul optic poate fi amplasat la \u00eenceputul fiec\u0103rei coloane, sau poate fi unul pentru mai multe (uneori chiar \u00eentre cl\u0103diri este instalat un cablu coaxial \u00een loc de unul optic), \u00een acest caz atenu\u0103rile inevitabile de pe divizoare \u0219i magistrale sunt compensate de amplificatoare. De exemplu, ca acesta:<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/a0fd51fe4fd14de6d567c2f098b59085.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Amplificator de semnal KTV Teleste CXE180RF<\/i><\/p>\n<p>Re\u021beaua de distribu\u021bie pentru abona\u021bi este construit\u0103 pe diferite tipuri de cablu coaxial \u0219i diverse divizoare, pe care le pute\u021bi vedea \u00een tabloul de distribu\u021bie a unui sistem de slab\u0103 tensiune pe scar\u0103.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021bele de televiziune prin cablu pentru cei mici. Partea 1: Arhitectura general\u0103 a re\u021belei CATV\" src=\"\/wp-content\/uploads\/2019\/04\/49e9dbaa5370f78788b3acacac8e2b92.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLa ie\u0219irile divizoarelor abona\u021bilor se conecteaz\u0103 cablurile care intr\u0103 \u00een apartament. <\/p>\n<p>Desigur, \u00een majoritatea cazurilor exist\u0103 mai multe televizoare \u00een fiecare apartament \u0219i acestea sunt conectate prin intermediul divizoarelor suplimentare, care contribuie de asemenea la atenuare. Prin urmare, \u00een anumite cazuri (c\u00e2nd \u00eentr-un apartament mare sunt multe televizoare) este necesar s\u0103 se instaleze amplificatoare suplimentare de semnal chiar \u00een apartament, care, pentru aceste scopuri, sunt adesea mai mici \u0219i mai slabe dec\u00e2t cele de uz industrial.<br \/>\n<br \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041a\u0430\u043a \u0431\u044b \u043f\u0440\u043e\u0441\u0432\u0435\u0449\u0451\u043d\u043d\u043e\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u043d\u0435 \u0440\u0443\u0433\u0430\u043b\u043e \u0442\u0435\u043b\u0435\u0432\u0438\u0434\u0435\u043d\u0438\u0435 \u0437\u0430 \u043d\u0435\u0433\u0430\u0442\u0438\u0432\u043d\u043e\u0435 \u0432\u043b\u0438\u044f\u043d\u0438\u0435 \u043d\u0430 \u0441\u043e\u0437\u043d\u0430\u043d\u0438\u0435, \u0442\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u0442\u0435\u043b\u0435\u0432\u0438\u0437\u0438\u043e\u043d\u043d\u044b\u0439 \u0441\u0438\u0433\u043d\u0430\u043b \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u043e \u0432\u0441\u0435\u0445 \u0436\u0438\u043b\u044b\u0445 (\u0438 \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u043d\u0435\u0436\u0438\u043b\u044b\u0445) \u043f\u043e\u043c\u0435\u0449\u0435\u043d\u0438\u044f\u0445. \u0412 \u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u0433\u043e\u0440\u043e\u0434\u0430\u0445 \u044d\u0442\u043e \u043f\u043e\u0447\u0442\u0438 \u0432\u0441\u0435\u0433\u0434\u0430 \u0442\u0435\u043b\u0435\u0432\u0438\u0434\u0435\u043d\u0438\u0435 \u043a\u0430\u0431\u0435\u043b\u044c\u043d\u043e\u0435, \u0434\u0430\u0436\u0435 \u0435\u0441\u043b\u0438 \u0432\u0441\u0435 \u0432\u043e\u043a\u0440\u0443\u0433 \u043f\u043e \u043f\u0440\u0438\u0432\u044b\u0447\u043a\u0435 \u043d\u0430\u0437\u044b\u0432\u0430\u044e\u0442 \u0435\u0433\u043e \u00ab\u0430\u043d\u0442\u0435\u043d\u043d\u0430\u00bb. \u0418 \u0435\u0441\u043b\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u043f\u0440\u0438\u0451\u043c\u0430 \u044d\u0444\u0438\u0440\u043d\u043e\u0433\u043e \u0442\u0435\u043b\u0435\u0432\u0438\u0434\u0435\u043d\u0438\u044f \u0432\u043f\u043e\u043b\u043d\u0435 \u043e\u0447\u0435\u0432\u0438\u0434\u043d\u0430 (\u0445\u043e\u0442\u044f \u0442\u043e\u0436\u0435 \u043c\u043e\u0436\u0435\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":24125,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-32308","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2.1 - 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