{"id":28586,"date":"2015-12-11T16:39:52","date_gmt":"2015-12-11T16:39:52","guid":{"rendered":"https:\/\/voipstudio.com\/blog\/voip-jitter-2\/"},"modified":"2025-12-11T17:17:23","modified_gmt":"2025-12-11T17:17:23","slug":"voip-jitter","status":"publish","type":"post","link":"https:\/\/voipstudio.com\/pl\/blog\/voip-jitter\/","title":{"rendered":"VoIP-Jak du\u017cy jitter jest akceptowalny?"},"content":{"rendered":"<p>Aby VoIP w przedsi\u0119biorstwie m\u00f3g\u0142 skutecznie konkurowa\u0107 ze zwyk\u0142ym starym systemem telefonicznym, jako\u015b\u0107 g\u0142osu powinna by\u0107 co najmniej r\u00f3wna lub lepsza ni\u017c w przypadku telefon\u00f3w analogowych. Jako\u015b\u0107 d\u017awi\u0119ku by\u0142a istotnym problemem w pierwszych implementacjach VoIP, kiedy technologia ta by\u0142a do\u015b\u0107 nowa na rynku.<\/p>\n<p>Od tego czasu sama technologia zosta\u0142a udoskonalona poprzez kilka iteracji. Dostawcy r\u00f3wnie\u017c zdobyli wiedz\u0119 i do\u015bwiadczenie, udoskonalaj\u0105c po drodze swoje us\u0142ugi czy infrastruktur\u0119.<\/p>\n<p>Niemniej jednak zapewnienie wysokiej jako\u015bci po\u0142\u0105cze\u0144 w spos\u00f3b ci\u0105g\u0142y mo\u017ce by\u0107 nie lada wyzwaniem dla organizacji biznesowych. Dzieje si\u0119 tak dlatego, \u017ce na jako\u015b\u0107 wp\u0142ywa wiele r\u00f3\u017cnych czynnik\u00f3w, a wdro\u017cenie rozwi\u0105zania dla jednego problemu mo\u017ce spowodowa\u0107 nasilenie innego.<\/p>\n<p>Aby uzyska\u0107 najlepsze i najbardziej p\u0142ynne rozmowy, konieczna jest optymalizacja sieci. Zwykle osi\u0105ga si\u0119 to poprzez skonfigurowanie odpowiednich ustawie\u0144 QoS, kt\u00f3re wskazuj\u0105 urz\u0105dzeniom sieciowym, \u017ce po\u0142\u0105czenia VoIP musz\u0105 by\u0107 traktowane priorytetowo w stosunku do innych form ruchu.<\/p>\n<p>Jednak regularne monitorowanie po\u0142\u0105cze\u0144 i sieci jest konieczne, aby zapewni\u0107, \u017ce nie ma du\u017cych odchyle\u0144 od oczekiwanej jako\u015bci. Najbardziej powszechne wska\u017aniki, kt\u00f3re s\u0105 u\u017cywane do pomiaru wydajno\u015bci sieci, a tym samym jako\u015bci d\u017awi\u0119ku, obejmuj\u0105 op\u00f3\u017anienie i jitter.<\/p>\n<h2>Op\u00f3\u017anienie<\/h2>\n<p>Jest to op\u00f3\u017anienie czasowe w przenoszeniu pakiet\u00f3w g\u0142osowych ze \u017ar\u00f3d\u0142a do miejsca przeznaczenia. Generalnie miara ta nie powinna przekracza\u0107 150ms w jednym kierunku, aby zapobiec pogorszeniu jako\u015bci po\u0142\u0105czenia.<\/p>\n<p>Je\u015bli cz\u0119\u015b\u0107 po\u0142\u0105czenia odbywa si\u0119 przez publiczny Internet (co wprowadza w\u0142asne op\u00f3\u017anienia), op\u00f3\u017anienie w sieci wewn\u0119trznej organizacji powinno by\u0107 znacznie mniejsze ni\u017c 150ms.<\/p>\n<h2>Jitter<\/h2>\n<p>Jest to zasadniczo zmienno\u015b\u0107 w op\u00f3\u017anieniu pakiet\u00f3w. Je\u015bli chodzi o \u017ar\u00f3d\u0142owy punkt ko\u0144cowy, pakiety zostaj\u0105 wys\u0142ane w ci\u0105g\u0142ym strumieniu.<\/p>\n<p>Poniewa\u017c jednak ka\u017cdy pakiet mo\u017ce pokonywa\u0107 inn\u0105 tras\u0119 do miejsca przeznaczenia, przeci\u0105\u017cenie sieci lub niew\u0142a\u015bciwa konfiguracja mog\u0105 powodowa\u0107 znaczne r\u00f3\u017cnice w op\u00f3\u017anieniu pakiet\u00f3w.<\/p>\n<p>Oznacza to, \u017ce pakiety nie b\u0119d\u0105 odbierane w tej samej kolejno\u015bci lub mog\u0105 zosta\u0107 ca\u0142kowicie odrzucone po drodze. Jitter przekraczaj\u0105cy 40ms spowoduje znaczne pogorszenie jako\u015bci po\u0142\u0105czenia. Wysoki jitteru jest zazwyczaj konsekwencj\u0105 niskiej pr\u0119dko\u015bci lub przeci\u0105\u017cenia sieci.<\/p>\n<h2>Jitter<\/h2>\n<p>Jitter mo\u017ce by\u0107 mierzony na wiele r\u00f3\u017cnych sposob\u00f3w, z kt\u00f3rych kilka jest wyszczeg\u00f3lnionych w r\u00f3\u017cnych standardach IETF dla RTP, takich jak RFC 3550 i RFC 3611. Niekt\u00f3re z tych metod to: \u015brednie op\u00f3\u017anienie mi\u0119dzy pakietami, \u015brednie bezwzgl\u0119dne op\u00f3\u017anienie mi\u0119dzy pakietami, histogramy op\u00f3\u017anienia mi\u0119dzy pakietami oraz parametr Y.1541 IPDV.<\/p>\n<p>Konieczne jest, aby firma rozumia\u0142a ka\u017cd\u0105 metod\u0119 i to, co dana warto\u015b\u0107 przekazuje, poniewa\u017c mog\u0105 one wykorzystywa\u0107 r\u00f3\u017cne parametry lub za\u0142o\u017cenia. Niestety wielu producent\u00f3w sprz\u0119tu lub dostawc\u00f3w us\u0142ug nie ujawnia, jak\u0105 metod\u0119 stosuj\u0105 do obliczania warto\u015bci jittera w swoich sieciach lub urz\u0105dzeniach.<\/p>\n<p>Jednak wielu dostawc\u00f3w uwzgl\u0119dnia obecnie \u015brednie warto\u015bci jittera w swoich umowach SLA, dzi\u0119ki czemu klienci mog\u0105 by\u0107 pewni minimalnych akceptowalnych standard\u00f3w jako\u015bci.<\/p>\n<h2>Jak skompensowa\u0107 jitter?<\/h2>\n<p>Je\u015bli chodzi o jitter, jedn\u0105 z pierwszych rzeczy, kt\u00f3re nale\u017cy sprawdzi\u0107, s\u0105 ustawienia QoS sieci firmowej. Je\u015bli QoS nie zosta\u0142 skonfigurowany lub zosta\u0142 ustawiony nieprawid\u0142owo, pakiety g\u0142osowe nie b\u0119d\u0105 otrzymywa\u0142y priorytetu. B\u0119dzie to skutkowa\u0107 nieodebranymi lub odrzuconymi pakietami.<\/p>\n<p>Po\u0142\u0105czenia audio b\u0119d\u0105 wi\u0119c nara\u017cone na wysoki poziom zak\u0142\u00f3ce\u0144 jitter, co pogorszy jako\u015b\u0107 rozm\u00f3w. Je\u015bli ustawienia QoS s\u0105 prawid\u0142owe, a ruch sieciowy jest na zwyk\u0142ym poziomie, nie powinno by\u0107 \u017cadnych znacz\u0105cych zak\u0142\u00f3ce\u0144.<\/p>\n<p>Punkty ko\u0144cowe VoIP, takie jak telefony stacjonarne i urz\u0105dzenia ATA, zazwyczaj zawieraj\u0105 bufor jittera, aby zrekompensowa\u0107 ten problem. Posiadanie bufora jittera zapewnia, \u017ce urz\u0105dzenie odbieraj\u0105ce jest w stanie przechowa\u0107 okre\u015blon\u0105 liczb\u0119 pakiet\u00f3w, a nast\u0119pnie u\u0142o\u017cy\u0107 je w odpowiedniej kolejno\u015bci.<\/p>\n<p>W zale\u017cno\u015bci od wielko\u015bci bufora jittera, pakiety poza kolejno\u015bci\u0105 mog\u0105 by\u0107 uporz\u0105dkowane przed dostarczeniem. Wprowadza to jednak pewne op\u00f3\u017anienie opr\u00f3cz oryginalnego op\u00f3\u017anienia w sieci.<\/p>\n<p>Bufory jittera nie zawsze b\u0119d\u0105 dzia\u0142a\u0107, chocia\u017c ich rozmiar mo\u017cna zwi\u0119kszy\u0107 do pewnego momentu. Generalnie s\u0105 one skuteczne tylko dla op\u00f3\u017anie\u0144 mniejszych ni\u017c 100 ms, a nawet wtedy pogorszenie jako\u015bci mo\u017ce by\u0107 \u0142atwo zauwa\u017calne dla u\u017cytkownik\u00f3w.<\/p>\n<p>Dost\u0119pne s\u0105 r\u00f3\u017cne narz\u0119dzia, kt\u00f3re mog\u0105 by\u0107 wykorzystane przez specjalist\u00f3w do izolowania \u017ar\u00f3de\u0142 jittera i ich usuwania. Dlatego organizacje powinny stara\u0107 si\u0119 zidentyfikowa\u0107 \u017ar\u00f3d\u0142a w swoich sieciach zamiast polega\u0107 na buforach.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Aby VoIP w przedsi\u0119biorstwie m\u00f3g\u0142 skutecznie konkurowa\u0107 ze zwyk\u0142ym starym systemem telefonicznym, jako\u015b\u0107 g\u0142osu powinna by\u0107 co najmniej r\u00f3wna lub lepsza ni\u017c [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":37201,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[293],"tags":[],"class_list":["post-28586","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologia-i-innowacje"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>VoIP-Jak du\u017cy jitter jest akceptowalny? 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