{"id":143627,"date":"2020-03-12T04:40:00","date_gmt":"2020-03-12T04:40:00","guid":{"rendered":"https:\/\/alliedtelesisprod.smmile.com\/ameliorations-peu-couteuses-de-linfrastructure-des-agences-de-la-circulation\/"},"modified":"2026-05-29T17:43:26","modified_gmt":"2026-05-29T17:43:26","slug":"inexpensive-infrastructure-upgrades-traffic-agencies","status":"publish","type":"post","link":"https:\/\/alliedtelesisprod.smmile.com\/fr\/inexpensive-infrastructure-upgrades-traffic-agencies\/","title":{"rendered":"Am\u00e9liorations peu co\u00fbteuses de l&#8217;infrastructure des agences de la circulation"},"content":{"rendered":"<p>De nombreuses villes am\u00e9ricaines ont des kilom\u00e8tres de c\u00e2bles en cuivre ou coaxiaux sous les rues et trottoirs, connectant des cam\u00e9ras analogiques mises aux intersections routi\u00e8res \u00e0 des bo\u00eetiers de contr\u00f4le ext\u00e9rieurs. Mais ces cam\u00e9ras ne r\u00e9pondent plus aux exigences des villes modernes en mati\u00e8re d\u2019analyse en temps r\u00e9el des flux de trafic pour une meilleure circulation. La mise \u00e0 niveau des cam\u00e9ras est simple, mais le changement des anciens c\u00e2bles enterr\u00e9s prend du temps et est tr\u00e8s co\u00fbteux.<\/p>\n<p>Les cam\u00e9ras num\u00e9riques et autres capteurs tels que les d\u00e9tecteurs LIDAR permettent de recueillir beaucoup plus d&#8217;informations pour une meilleure prise de d\u00e9cision et des flux de trafic plus efficaces. Cependant, ces appareils d\u00e9pendent de la connectivit\u00e9 Ethernet, qui impose des restrictions sur le type et la longueur des c\u00e2bles. Plus pr\u00e9cis\u00e9ment, les c\u00e2bles Ethernet ne peuvent pas d\u00e9passer 100 m\u00e8tres (330 pieds), et pour aller plus loin, des r\u00e9p\u00e9teurs ou des c\u00e2bles \u00e0 fibres optiques sont n\u00e9cessaires. La fibre est une option peu attrayante, car la pose de nouveaux c\u00e2bles entra\u00eene des co\u00fbts et des retards suppl\u00e9mentaires pour le projet, ainsi que des perturbations dans les rues et les trottoirs.<\/p>\n<p>Une meilleure alternative consiste \u00e0 r\u00e9utiliser le c\u00e2blage existant, ce qui est possible en transmettant les donn\u00e9es Ethernet sur une connexion VDSL2, ce qui permet de les envoyer sur de plus longues distances de c\u00e2bles d\u00e9j\u00e0 en place. La ligne d&#8217;abonn\u00e9 num\u00e9rique \u00e0 tr\u00e8s haut d\u00e9bit 2 (VDSL2) a \u00e9t\u00e9 con\u00e7ue pour transporter des donn\u00e9es \u00e0 haut d\u00e9bit sur plusieurs kilom\u00e8tres de fil t\u00e9l\u00e9phonique ou de c\u00e2ble coaxial. Il s&#8217;agit de la m\u00eame technologie que celle utilis\u00e9e pour fournir la connectivit\u00e9 Internet \u00e0 des millions de foyers am\u00e9ricains. Elle est donc \u00e9prouv\u00e9e sur le terrain, facile \u00e0 installer et tr\u00e8s rentable.<\/p>\n<p>Le diagramme ci-dessous montre comment nous envoyons des flux vid\u00e9o Ethernet \u00e0 partir des cam\u00e9ras num\u00e9riques sur des liaisons VDSL2 de l&#8217;intersection au concentrateur c\u00f4t\u00e9 rue. Le VDSL2 transporte les donn\u00e9es vid\u00e9o sur les anciens c\u00e2bles souterrains existants jusqu&#8217;aux concentrateurs, o\u00f9 elles sont agr\u00e9g\u00e9es par le commutateur et transmises au centre de gestion du trafic de la ville.<\/p>\n<p>&nbsp;<\/p>\n<div data-embed-button=\"image_embed\" data-entity-embed-display=\"view_mode:media.entity_embed\" data-entity-embed-display-settings=\"[]\" data-entity-type=\"media\" data-entity-uuid=\"d43a2bc3-d4e7-4aa9-a8bf-e806eb2baa22\" data-langcode=\"fr\" class=\"embedded-entity\">\n<div class=\"media media__type--image media__view-mode--entity-embed\">\n<p>                  <img fetchpriority=\"high\" decoding=\"async\" loading=\"eager\" class=\"field field--name-field-media-image field--type-image field--label-hidden\" width=\"1112\" height=\"308\" src=\"https:\/\/alliedtelesisprod.smmile.com\/wp-content\/uploads\/2026\/06\/traffic-diagram1.png\" alt=\"traffic diagram\"><\/p><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h2>Qu&#8217;est-ce que VDSL2<\/h2>\n<p>VDSL2 est une technologie \u00e0 large bande qui prend en charge le d\u00e9ploiement de services triple play tels que la voix, la vid\u00e9o, les donn\u00e9es et la t\u00e9l\u00e9vision haute d\u00e9finition (TVHD). Le VDSL2 peut transmettre des donn\u00e9es \u00e0 haute vitesse sur le c\u00e2blage existant utilis\u00e9 pour le service t\u00e9l\u00e9phonique analogique et les connexions DSL \u00e0 faible vitesse.<\/p>\n<h2>Taux vs Port\u00e9e<\/h2>\n<p>Le VDSL2 utilise des techniques de traitement du signal num\u00e9rique pour envoyer des donn\u00e9es sur des c\u00e2bles d\u00e9j\u00e0 en place. La vitesse de transmission est affect\u00e9e par la longueur des c\u00e2bles, comme indiqu\u00e9 ci-dessous:<\/p>\n<div data-embed-button=\"image_embed\" data-entity-embed-display=\"view_mode:media.entity_embed\" data-entity-embed-display-settings=\"[]\" data-entity-type=\"media\" data-entity-uuid=\"3ef0d12c-7c9f-4c4a-bd38-7b43e5f34b78\" data-langcode=\"fr\" class=\"embedded-entity\">\n<div class=\"media media__type--image media__view-mode--entity-embed\">\n<p>                  <img decoding=\"async\" loading=\"eager\" class=\"field field--name-field-media-image field--type-image field--label-hidden\" width=\"1141\" height=\"810\" src=\"https:\/\/alliedtelesisprod.smmile.com\/wp-content\/uploads\/2026\/06\/rate-vs-reach-chart.png\" alt=\"reach vs reach chart\"><\/p><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h2>Cam\u00e9ras IP<\/h2>\n<p>Une cam\u00e9ra IP (Internet Protocol) est un type de cam\u00e9ra vid\u00e9o num\u00e9rique qui re\u00e7oit des donn\u00e9es de contr\u00f4le et envoie des donn\u00e9es d&#8217;image via une connexion r\u00e9seau Ethernet. Contrairement aux cam\u00e9ras de t\u00e9l\u00e9vision en circuit ferm\u00e9 analogiques (CCTV), elles ne n\u00e9cessitent aucun appareil d&#8217;enregistrement local, mais uniquement un r\u00e9seau local.<\/p>\n<p>Le besoin de haute r\u00e9solution, de fid\u00e9lit\u00e9 des couleurs et de fr\u00e9quence d&#8217;images est essentiel \u00e0 des fins de surveillance afin de garantir que la qualit\u00e9 de la sortie vid\u00e9o est d&#8217;une norme acceptable qui peut \u00eatre utilis\u00e9e \u00e0 la fois pour la surveillance pr\u00e9ventive et \u00e0 des fins de preuve. Cependant, ces besoins doivent \u00eatre mis en balance avec les besoins suppl\u00e9mentaires en bande passante pour transmettre la vid\u00e9o HD.<\/p>\n<p>Les normes vid\u00e9o haute d\u00e9finition courantes sont constitu\u00e9es de 1 080 ou 720 lignes d&#8217;informations d&#8217;image, commun\u00e9ment appel\u00e9es respectivement 1080p et 720p. En revanche, la r\u00e9solution de t\u00e9l\u00e9vision num\u00e9rique r\u00e9guli\u00e8re ne contient que 480 lignes (pour NTSC). La vid\u00e9o 720p a des exigences de bande passante plus faibles que la vid\u00e9o 1080p en raison de sa r\u00e9solution inf\u00e9rieure (c&#8217;est-\u00e0-dire une taille d&#8217;image plus petite).<\/p>\n<p>De nombreuses variables peuvent affecter la bande passante requise pour un flux vid\u00e9o, telles que la fr\u00e9quence d&#8217;images, la compression et la r\u00e9solution. Ainsi, les valeurs ci-dessous sont utiles comme estimation approximative des besoins en bande passante (sur une fr\u00e9quence d&#8217;images de 30 ips et une compression H.264):<\/p>\n<ul>\n<li>Cam\u00e9ra HD 720p: 2 Mbps<\/li>\n<li>Cam\u00e9ra Full HD 1080p: 4 Mbps<\/li>\n<li>Cam\u00e9ra Ultra-HD 4K: 16Mbps<\/li>\n<\/ul>\n<p>Si votre ville souhaite mettre en \u0153uvre une meilleure gestion du trafic mais h\u00e9site en raison des co\u00fbts du projet de rec\u00e2blage, envisagez d&#8217;utiliser le VDSL2 comme une alternative rapide, facile, fiable et peu co\u00fbteuse.<\/p>\n<p>Allied Telesis peut fournir l&#8217;\u00e9quipement de commutation VDSL2 et Ethernet industriel requis et poss\u00e8de l&#8217;exp\u00e9rience n\u00e9cessaire pour le d\u00e9ployer avec succ\u00e8s. Allied Telesis a travaill\u00e9 avec d&#8217;autres villes am\u00e9ricaines qui ont d\u00e9j\u00e0 adopt\u00e9 cette approche et qui sont en train de d\u00e9ployer rapidement des programmes am\u00e9lior\u00e9s de gestion du trafic \u00e0 l&#8217;\u00e9chelle de la ville. Contactez-nous pour en savoir plus.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article describes a use case for Allied Telesis VDSL media converters and explains the benefits for traffic agencies worldwide.<\/p>\n","protected":false},"author":3,"featured_media":116921,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"location":[],"markets":[7273],"partners":[7974],"posttype":[7993],"products":[8016],"services":[],"solutions":[],"site_tags":[8131,8160,8157],"technologies":[],"class_list":["post-143627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","markets-transportation","partners-digi","posttype-blogpost","products-mediaconverters","site_tags-iotapplications","site_tags-mediaconverters","site_tags-smartcities"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - 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