{"id":16635,"date":"2018-07-20T10:11:49","date_gmt":"2018-07-20T08:11:49","guid":{"rendered":"https:\/\/blog.wildix.com\/?p=16635"},"modified":"2018-07-20T10:11:49","modified_gmt":"2018-07-20T08:11:49","slug":"standard-fax-t-38-a-ete-rendu-necessaire-lapparition-reseaux-ip","status":"publish","type":"post","link":"https:\/\/blog.wildix.com\/fr\/standard-fax-t-38-a-ete-rendu-necessaire-lapparition-reseaux-ip\/","title":{"rendered":"Le standard Fax T.38 a \u00e9t\u00e9 rendu n\u00e9cessaire avec l&rsquo;apparition des r\u00e9seaux IP"},"content":{"rendered":"<h1><img decoding=\"async\" class=\"alignleft\" style=\"font-size: 1rem;\" src=\"https:\/\/scontent-mxp1-1.xx.fbcdn.net\/v\/t1.0-9\/37393474_1113079088860468_4200785797139398656_n.jpg?_nc_cat=0&amp;oh=07246b861eb3ab8f50d0044a19ee75c0&amp;oe=5BE75C3A\" alt=\"L\u00e2\u0080\u0099image contient peut-\u00c3\u00aatre\u00c2\u00a0: texte\" \/><\/h1>\n<div class=\"text_exposed_show\">\n<p>Si les codecs sans compression rendent encore possible le transport de fax traditionnel sur des r\u00e9seaux IP (G.711 passthrough), les codecs tels que le G.729 et le G.723.1 sont inadapt\u00e9s \u00e0 ce type de transmission de par leur conception d\u00e9di\u00e9e exclusivement \u00e0 la compression de la voix.<\/p>\n<p><strong>L&rsquo;application la plus courante du T.38 est celle d&rsquo;une communication o\u00f9 l&rsquo;une des partie de trouve sur un r\u00e9seau IP et l&rsquo;autre sur le R\u00e9seau T\u00e9l\u00e9phonique Commut\u00e9.<\/strong> Il est aussi parfaitement possible d&rsquo;\u00e9changer des fax entre deux \u00e9quipements d&rsquo;un r\u00e9seau IP par le T.38.<\/p>\n<p><!--more--><\/p>\n<p>&nbsp;<\/p>\n<h3>Bande passante optimis\u00e9e<\/h3>\n<p>Lors qu&rsquo;un fax est transmis sans T.38 au moyen du G.711, la bande passante consomm\u00e9e est alors de 64 kbits\/s. En revanche, le T.38 est exactement adapt\u00e9 \u00e0 la vitesse de transmission du fax qui est, au plus, de <strong>14.400 bits\/s<\/strong>. De plus le protocole de transmission des fax \u00e9tant de type half-duplex, un seul canal est n\u00e9cessaire en T.38 contre deux pour une transmission fax sur G.711.<\/p>\n<h3><strong>Synchronisation d&rsquo;horloges PCM<\/strong><\/h3>\n<p>La transmission de fax n\u00e9cessite des horloges d&rsquo;une pr\u00e9cision suffisante pour r\u00e9aliser <strong>l&rsquo;\u00e9chantillonnage<\/strong> du signal \u00e0 une fr\u00e9quence de 8 kHz (fr\u00e9quence d&rsquo;encodage G.711 des r\u00e9seaux commut\u00e9s). Il arrive que certains adaptateurs de terminal utilis\u00e9s en VoIP d\u00e9livrent des horloges pr\u00e9sentant une l\u00e9g\u00e8re d\u00e9rive ayant pour cons\u00e9quence une saturation des m\u00e9moires tampon et des erreurs de transmission sur des fax contenant des images complexes ou ayant un nombre de pages cons\u00e9quent.<\/p>\n<h3><strong>Pertes de paquets<\/strong><\/h3>\n<p>Le T.38 a \u00e9t\u00e9 con\u00e7u pour<strong> compenser les \u00e9ventuelles pertes de paquets IP<\/strong> gr\u00e2ce \u00e0 la redondance des donn\u00e9es transmises. Lorsqu&rsquo;un paquet est envoy\u00e9, un, deux, trois ou davantage de paquets pr\u00e9c\u00e9demment transmis peuvent \u00eatre renvoy\u00e9s (fax redundancy depth). La consommation en bande passante est alors augment\u00e9e mais reste inf\u00e9rieure \u00e0 celle du G.711 tout en am\u00e9liorant la qualit\u00e9 de la transmission.<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Si les codecs sans compression rendent encore possible le transport de fax traditionnel sur des r\u00e9seaux IP (G.711 passthrough), les codecs tels que le G.729 et le G.723.1 sont inadapt\u00e9s \u00e0 ce type de transmission de par leur conception d\u00e9di\u00e9e exclusivement \u00e0 la compression de la voix. L&rsquo;application la plus courante du T.38 est celle &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/blog.wildix.com\/fr\/standard-fax-t-38-a-ete-rendu-necessaire-lapparition-reseaux-ip\/\" class=\"more-link\">Continuer la lecture<span class=\"screen-reader-text\"> de &laquo;&nbsp;Le standard Fax T.38 a \u00e9t\u00e9 rendu n\u00e9cessaire avec l&rsquo;apparition des r\u00e9seaux IP&nbsp;&raquo;<\/span><\/a><\/p>\n","protected":false},"author":475,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[80],"tags":[],"class_list":["post-16635","post","type-post","status-publish","format-standard","hentry","category-infostechniques"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le standard Fax T.38 a \u00e9t\u00e9 rendu n\u00e9cessaire avec l&#039;apparition des r\u00e9seaux IP | Wildix<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wildix.com\/fr\/standard-fax-t-38-a-ete-rendu-necessaire-lapparition-reseaux-ip\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le standard Fax T.38 a \u00e9t\u00e9 rendu n\u00e9cessaire avec l&#039;apparition des r\u00e9seaux IP | Wildix\" \/>\n<meta property=\"og:description\" content=\"Si les codecs sans compression rendent encore possible le transport de fax traditionnel sur des r\u00e9seaux IP (G.711 passthrough), les codecs tels que le G.729 et le G.723.1 sont inadapt\u00e9s \u00e0 ce type de transmission de par leur conception d\u00e9di\u00e9e exclusivement \u00e0 la compression de la voix. L&rsquo;application la plus courante du T.38 est celle &hellip; Continuer la lecture de &laquo;&nbsp;Le standard Fax T.38 a \u00e9t\u00e9 rendu n\u00e9cessaire avec l&rsquo;apparition des r\u00e9seaux IP&nbsp;&raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.wildix.com\/fr\/standard-fax-t-38-a-ete-rendu-necessaire-lapparition-reseaux-ip\/\" \/>\n<meta property=\"og:site_name\" content=\"Wildix Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/wildix.pbx\" \/>\n<meta property=\"article:published_time\" content=\"2018-07-20T08:11:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/scontent-mxp1-1.xx.fbcdn.net\/v\/t1.0-9\/37393474_1113079088860468_4200785797139398656_n.jpg?_nc_cat=0&amp;oh=07246b861eb3ab8f50d0044a19ee75c0&amp;oe=5BE75C3A\" \/>\n<meta name=\"author\" content=\"Bertrand BROUSSAUDIER\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@WildixSrl\" 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