{"id":34051,"date":"2019-10-31T21:56:10","date_gmt":"2019-10-31T18:56:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set\/"},"modified":"2019-10-31T21:56:10","modified_gmt":"2019-10-31T18:56:10","slug":"seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/seti-kabelnogo-televideniya-dlya-samyh-malenkih-chast-5-koaksialnaya-raspredelitelnaya-set","title":{"rendered":"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/4bc7a2511dcc5bb76581ddc03fff9f32.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDup\u0103 ce am trecut prin conceptele teoretice, s\u0103 trecem la descrierea p\u0103r\u021bii hardware a re\u021belelor de televiziune prin cablu. Voi \u00eencepe povestea de la receptorul abonatului \u0219i, mai detaliat, dec\u00e2t \u00een <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">prima parte<\/a><\/noindex> voi povesti despre toate componentele re\u021belei.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<b class=\"spoiler_title\">Con\u021binutul seriei de articole<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449322\/\">Partea 1: Arhitectura general\u0103 a re\u021belei CATV<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/449902\/\">Partea 2: Compozi\u021bia \u0219i forma semnalului<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450256\/\">Partea 3: Componenta analogic\u0103 a semnalului<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450258\/\">Partea 4: Componenta digital\u0103 a semnalului<\/a><\/noindex><\/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<h1>Cablu<\/h1>\n<p>\nPriza televizorului se conecteaz\u0103 la divisor \u00een interiorul apartamentului sau (dac\u0103 exist\u0103 un singur televizor) \u2014 la verticala din tabloul de distribu\u021bie de pe scar\u0103. Dup\u0103 cum se \u0219tie, fiecare conexiune suplimentar\u0103 reprezint\u0103 o poten\u021bial\u0103 defectare, a\u0219a c\u0103, \u00een timpul c\u0103ut\u0103rii problemelor, merit\u0103 s\u0103 acord\u0103m aten\u021bie fiec\u0103rui racord.<\/p>\n<p>\u00cen interiorul apartamentului \u0219i p\u00e2n\u0103 la tabloul de distribu\u021bie se instaleaz\u0103, de regul\u0103, cunoscutul cablu coaxial de tip RG-6, care se termin\u0103 cu conectori simpli, av\u00e2nd de obicei contact doar cu ecranul, iar conductorul central intr\u0103 \u00een conectorul dispozitivului sau adaptatorului \u201ea\u0219a cum este\u201d.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/23ccaf1ad0b1209f3a9707a4e062c0fa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/995cd136708b021f9d9402d2e9e3347c.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/137128c73e8f6c8068cabd4653216ea2.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPentru instalarea magistralelor se folose\u0219te cablul RG-11, care are o atenuare mai mic\u0103 pe lungime \u0219i o rezisten\u021b\u0103 mai mare. Exist\u0103, de asemenea, o variant\u0103 autoportant\u0103 a acestui cablu cu un cablu de o\u021bel \u00een ecran pentru instalarea \u00een aer.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/1a812cf4641a5d7ba3fb006713313f1b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAcest cablu este mai gros \u0219i mai rigid, astfel c\u0103 pentru terminarea sa se folosesc conectori mai complica\u021bi: fie conectori de crimpare asem\u0103n\u0103tori celor de dimensiuni mai mici, fie structuri compuse filetat\u0103 caracteristice echipamentelor industriale.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/05ffcf089b07695d53d29df53ec848cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCrimparea unui conector pe un astfel de cablu poate fi complicat\u0103 \u0219i, adesea, problemele apar imediat dup\u0103 montaj din cauza necorespunderii standardului pentru lungimea de stripping (6,3 mm conductor central + 6,3 mm ecran), sau ulterior din cauza contactului slab la crimpare f\u0103r\u0103 instrumente speciale.<\/p>\n<h1>Divizoare \u0219i distribuitoare<\/h1>\n<p>\nAtunci c\u00e2nd se construie\u0219te verticala se folosesc distribuitoare \u0219i divizoare.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/5a06616f0df2571db776fd45b9a21f79.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00cen interior, acestea reprezint\u0103 o separare din circuite LC pentru armonizarea impedan\u021bei de und\u0103 a ie\u0219irilor. Dac\u0103 se \u00eemparte cablul coaxial f\u0103r\u0103 un astfel de dispozitiv, doar prin \u00eembin\u0103ri, atunci impeden\u021ba redus\u0103 la conectarea paralel\u0103 a fiec\u0103rui bran\u0219ament nu va permite semnalului s\u0103 treac\u0103 complet \u0219i o parte dintre acesta se va reflecta \u00eenapoi \u00een magistral\u0103, ceea ce va duce la apari\u021bia interferen\u021belor \u0219i a zgomotului \u00een semnal.<\/p>\n<p>Diferen\u021ba fundamental\u0103 \u00eentre bifurca\u021bii \u0219i divizoare const\u0103 \u00een prezen\u021ba sau absen\u021ba ie\u0219irii liniare (OUT). Pierderile pe o astfel de ie\u0219ire sunt minime \u0219i se situeaz\u0103 \u00eentre 1-5 dB \u00een func\u021bie de nominal. Pe ramurile de abona\u021bi (TAP), atenuarea variaz\u0103 de la 8 la 30 dB sau mai mult. Acest lucru este necesar pentru a asigura un nivel de semnal uniform pe ramurile de abona\u021bi, indiferent de nivelul din magistral\u0103. <br \/>\n<img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/d6a5f823729a7f5cc0382cfb711498e7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/2ca65e3dab99545dd741f22195f55530.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nDac\u0103 la \u00eenceputul conductei avem un semnal cu un nivel de 105 dB\u03bcV, atunci pentru a livra abona\u021bilor de pe ramur\u0103 un nivel de 75 dB\u03bcV, este necesar s\u0103 instal\u0103m un divizor cu o atenuare de 30 dB. Iar la cap\u0103tul \u00eendep\u0103rtat al magistralei poate ajunge un semnal de mai pu\u021bin de 85 dB, \u00een acest caz este necesar s\u0103 instal\u0103m un divizor, ale c\u0103rui pierderi pe ramuri sunt minime, iar pentru un divizor cu patru ie\u0219iri se ridic\u0103 la 8 dB. Nominalul de atenuare \u0219i num\u0103rul de ie\u0219iri sunt codificate practic \u00een marcajul dispozitivului, de exemplu, \u00een imaginea de mai sus vedem 620 \u2014 6 ramuri de abona\u021bi, care atenuaz\u0103 fiecare cu c\u00e2te 20 dB \u0219i una magistral\u0103. Denota\u021bia TAH \u0219i SAH nu este acceptat\u0103 universal, dar \u00eent\u00e2lne\u0219te frecvent \u0219i semnific\u0103, respectiv, bifurca\u021bii (tap) sau divizoare (split).<\/p>\n<p>Pentru a reduce diferen\u021ba de nivel de semnal \u00eentre por\u021biuni ale conductei, \u00een cl\u0103dirile \u00eenalte este necesar s\u0103 \u00eemp\u0103r\u021bim aceasta \u00een mai multe p\u0103r\u021bi cu ajutorul bifurca\u021biilor magistrale. Acest lucru permite reducerea gamei de bifurca\u021bii de abona\u021bi \u0219i asigurarea unui nivel c\u00e2t mai apropiat de cel necesar pe ramura de abona\u021bi.<\/p>\n<p>\u00cen schem\u0103, am ar\u0103tat un exemplu de conduct\u0103 construit\u0103 de sus \u00een jos \u0219i \u00eemp\u0103r\u021bit\u0103 \u00een trei p\u0103r\u021bi (\u201epilastri\u201d). Pe tablourile electrice de 12 etaje se folosesc doar 5 tipuri de bifurca\u021bii de abona\u021bi. Dac\u0103 nu ar fi fost \u00eemp\u0103r\u021birea, ar fi fost necesar s\u0103 folosim 12 tipuri cu un interval de 2-3 dB. Iar pentru cap\u0103tul \u00eendep\u0103rtat, cel mai probabil nu am fi putut alege un divizor, deoarece chiar \u0219i un divizor cu doar dou\u0103 ie\u0219iri \u201epe jum\u0103tate\u201d atenuaz\u0103 4 dB, iar cu un num\u0103r mai mare de ie\u0219iri am putea s\u0103 nu ne \u00eencadr\u0103m \u00een bugetul de atenuare.<\/p>\n<p>\u00cen cazul \u00een care \u00een sistem se folose\u0219te alimentarea la distant\u0103 a echipamentului (despre care voi discuta cu siguran\u021b\u0103 \u00een p\u0103r\u021bile urm\u0103toare), bifurca\u021biile magistrale arat\u0103 pu\u021bin diferit:<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/183a9636228617f04d67ab80b7607a24.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/745dc8dfbae376f7be48d3baeee028ed.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDatorit\u0103 carcasei masive \u0219i a construc\u021biei bine g\u00e2ndite, se asigur\u0103 o izola\u021bie superioar\u0103 at\u00e2t a componentelor conductoare de la influen\u021bele externe, c\u00e2t \u0219i a mediului extern de curentul semnificativ care poate circula prin cablu.<\/p>\n<h1>Elemente de protec\u021bie<\/h1>\n<p>\nPentru a proteja echipamentele de posibile incidente pe cablu, precum \u0219i abona\u021bii de defec\u021biunile echipamentului activ, se instaleaz\u0103 izolatoare la \u00eenceputul st\u00e2lpilor, care ofer\u0103 o separa\u021bie galvanic\u0103 \u00eentre partea principal\u0103 \u0219i distribu\u021bie.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/c163212a2fb7243055e7e843f50a17cc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPentru a evita reflectarea semnalului de la termina\u021biile necorespunz\u0103toare (constructiv, acestea sunt doar abla\u021bii de trecere, dar exist\u0103 posibilitatea ca, \u00een cazul unei asambl\u0103ri necorespunz\u0103toare sau defecte a divizorului, abona\u021bii s\u0103 aib\u0103, de asemenea, o rezisten\u021b\u0103 de und\u0103 diferit\u0103 de cea necesar\u0103), este indicat s\u0103 le bloca\u021bi cu capace absorbante adecvate, care poart\u0103 adesea \u0219i func\u021bia de \u00absecret\u00bb, \u00een cazul \u00een care cu locatarii se semneaz\u0103 contracte individuale pentru furnizarea de servicii.<\/p>\n<p><img decoding=\"async\" alt=\"Re\u021belele de cablu TV pentru cei mici. Partea 5: Re\u021beaua de distribu\u021bie coaxial\u0103\" src=\"\/wp-content\/uploads\/2019\/05\/c0a3199785bbc1d5a3d9509993df3faa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/450278\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u043e\u0439\u0434\u044f\u0441\u044c \u043f\u043e \u0442\u0435\u043e\u0440\u0435\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u043e\u0441\u043d\u043e\u0432\u0430\u043c, \u043f\u0435\u0440\u0435\u0439\u0434\u0451\u043c \u043a \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u044e \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u0447\u0430\u0441\u0442\u0438 \u0441\u0435\u0442\u0435\u0439 \u043a\u0430\u0431\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0442\u0435\u043b\u0435\u0432\u0438\u0434\u0435\u043d\u0438\u044f. \u041d\u0430\u0447\u043d\u0443 \u0440\u0430\u0441\u0441\u043a\u0430\u0437 \u043e\u0442 \u0442\u0435\u043b\u0435\u043f\u0440\u0438\u0451\u043c\u043d\u0438\u043a\u0430 \u0430\u0431\u043e\u043d\u0435\u043d\u0442\u0430 \u0438, \u0431\u043e\u043b\u0435\u0435 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e, \u0447\u0435\u043c \u0432 \u043f\u0435\u0440\u0432\u043e\u0439 \u0447\u0430\u0441\u0442\u0438 \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u043e \u0432\u0441\u0435\u0445 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0445 \u0441\u0435\u0442\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 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":25705,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-34051","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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