{"id":38000,"date":"2011-09-22T21:25:06","date_gmt":"2011-09-22T19:25:06","guid":{"rendered":"https:\/\/promocionalia.es\/web\/2011\/09\/22\/conceptos-basicos-de-telecos-redes-inalambricas-wimax-y-en-bandas-de-uso-comun-wifi\/"},"modified":"2024-05-07T18:26:04","modified_gmt":"2024-05-07T16:26:04","slug":"conceptos-basicos-de-telecos-redes-inalambricas-wimax-y-en-bandas-de-uso-comun-wifi","status":"publish","type":"post","link":"https:\/\/promocionalia.es\/web\/conceptos-basicos-de-telecos-redes-inalambricas-wimax-y-en-bandas-de-uso-comun-wifi\/","title":{"rendered":"Conceptos b\u00e1sicos de Telecos: Redes inal\u00e1mbricas (Wimax) y en bandas de uso com\u00fan (Wifi)"},"content":{"rendered":"<div class=\"post-meta\" style=\"font-size: 0.9em; color: #777777; padding: 0px; margin: 0px;\">28 mayo 2010 |&nbsp;<a href=\"http:\/\/blogcmt.com\/author\/inmaguerra\/\" title=\"Entradas de inmaguerra\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\">inmaguerra<\/a> | 5 Comentarios<\/div>\n<div class=\"post\" style=\"margin-top: 0px; margin-right: 0px; margin-bottom: 2em; margin-left: 0px; text-align: justify; padding: 0px;\">\n<div class=\"twitter_button\" style=\"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 10px; float: right; padding: 0px;\">&nbsp;<\/div>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">Como ya os prometimos&nbsp;<a href=\"http:\/\/blogcmt.com\/2010\/05\/21\/conceptos-basicos-del-telecos-evolucion-de-las-comunicaciones-moviles-del-gsm-al-lte\/\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\">en el post anterior<\/a> de la saga de conceptos de telecos, ten\u00edamos pendiente una segunda parte dedicada a las<strong style=\"padding: 0px; margin: 0px;\">redes inal\u00e1mbricas fijas <\/strong>(LMDS\/<strong style=\"padding: 0px; margin: 0px;\">WiMAX<\/strong>) y las&nbsp;<strong style=\"padding: 0px; margin: 0px;\">redes en bandas de<\/strong><strong style=\"padding: 0px; margin: 0px;\">uso com\u00fan<\/strong> (como el&nbsp;<a href=\"http:\/\/es.wikitel.info\/wiki\/WiFi\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\"><strong style=\"padding: 0px; margin: 0px;\">wifi<\/strong><\/a>). Estas tecnolog\u00edas constituyen una gran alternativa para dar conexi\u00f3n a Internet sin cables y de forma ubicua en las ciudades y en las \u00e1reas rurales donde el despliegue de cable o fibra debido a la baja densidad de poblaci\u00f3n presenta unos costos por usuario muy elevados.<\/p>\n<div id=\"attachment_13340\" class=\"wp-caption aligncenter\" style=\"width: 510px; padding: 0px; margin: 0px;\"><a href=\"http:\/\/www.flickr.com\/photos\/gunes_t\/252218894\/\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-13340\" src=\"http:\/\/blogcmt.com\/wp-content\/uploads\/2010\/05\/wifi.jpg\" alt=\"wifi\" style=\"padding-top: 3px; padding-right: 0px; padding-bottom: 3px; padding-left: 0px; margin: 0px; border: initial none initial;\" height=\"336\" width=\"500\" \/><\/a> <\/p>\n<p class=\"wp-caption-text\" style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; font: normal normal normal 0.75em\/normal Arial, Helvetica, Geneva, sans-serif; color: #999999; font-weight: bold; margin: 0px;\">Conectados desde cualquier punto<\/p>\n<\/p><\/div>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">&nbsp;<\/p>\n<h3 style=\"margin-top: 1em; margin-right: 0px; margin-bottom: -0.5em; margin-left: 0px; padding-top: 1em; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; font-size: 1em; text-transform: uppercase; letter-spacing: normal; color: #34353e; border-bottom-width: initial; border-bottom-style: none; border-bottom-color: initial; clear: both; text-align: justify;\">REDES INAL\u00c1MBRICAS FIJAS: LMDS\/WIMAX<\/h3>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">Las redes de transmisi\u00f3n de datos fijas sin hilos (<a href=\"http:\/\/es.wikipedia.org\/wiki\/LMDS\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\">LMDS<\/a>\/<a href=\"http:\/\/es.wikipedia.org\/wiki\/WiMAX\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\">WiMAX<\/a>)&nbsp;permiten&nbsp;capacidades de transmisi\u00f3n por usuario que oscilan entre los&nbsp;512 kbps-4 Mbps, la posibilidad de&nbsp;prestar servicio telef\u00f3nico y una cobertura de decenas de kil\u00f3metros alrededor de la estaci\u00f3n de base. En este tipo de redes, el bucle de abonado se establece mediante un enlace inal\u00e1mbrico entre el usuario y la estaci\u00f3n base.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">En Espa\u00f1a, &nbsp;los operadores<a href=\"http:\/\/www.iberbanda.es\/\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\"> Iberbanda<\/a>,&nbsp;<a href=\"http:\/\/www.neo-sky.com\/index.aspx?gclid=CLy3iNjQ6KECFYts4wodVVBWKg\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\">NEO-sky<\/a>,<a href=\"http:\/\/www.clearwire.es\/home.html\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\"> Clearwire<\/a> u<a href=\"http:\/\/www.ono.es\/ofertas\/?utm_source=google&amp;utm_medium=cpc&amp;utm_term=ono&amp;utm_campaign=Marca%2bONO%2bExacta\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\"> ONO<\/a> tienen asignada desde el a\u00f1o 2000 la banda de&nbsp;&nbsp;3,5 GHz para ofrecer este tipo de servicios.&nbsp;Sin embargo, una&nbsp;<a href=\"http:\/\/eur-lex.europa.eu\/LexUriServ\/LexUriServ.do?uri=OJ:L:2008:144:0077:0081:EN:PDF\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\">decisi\u00f3n europea <\/a>armoniz\u00f3 en mayo de 2008&nbsp;esta banda para aplicaciones de comunicaciones electr\u00f3nicas en condiciones neutrales y su implementaci\u00f3n requerir\u00eda modificar las actuales licencias.<\/p>\n<ul style=\"margin-top: 1px; margin-right: 5px; margin-bottom: 7px; margin-left: 15px; list-style-type: square; list-style-position: initial; list-style-image: initial; text-align: justify; padding: 5px;\">\n<li style=\"margin-top: 0px; margin-right: 0px; margin-bottom: 3px; margin-left: 0px; padding: 0px;\">WiMAX<\/li>\n<\/ul>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">Las tecnolog\u00eda&nbsp;<a href=\"http:\/\/es.wikitel.info\/wiki\/WiMAX\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\">WiMAX<\/a> (<em style=\"padding: 0px; margin: 0px;\">Worldwide Interoperability for Microwave Access<\/em>), se emplea para crear redes de transmisi\u00f3n de datos de forma inal\u00e1mbrica en el \u00e1rea metropolitana y es capaz de soportar m\u00faltiples servicios de banda ancha.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">Estas redes se basan en el protocolo IEEE 802.16 y&nbsp; se caracterizan por: a)&nbsp;un \u00e1rea de cobertura por estaci\u00f3n de entre 500 metros y 30 km (dependiendo del servicio); b) permiten compatibilizar la calidad del servicio y la seguridad;&nbsp;c) posibilitan&nbsp;la conexi\u00f3n de terminales a diferentes velocidades de transmisi\u00f3n ( de hasta 70 Mbps si el espectro est\u00e1 limpio) y d)&nbsp; se adapta a diferentes topolog\u00edas de red (Punto a punto y Punto-multipunto o bien de fijo, n\u00f3mada y m\u00f3vil). Adem\u00e1s, esta tecnolog\u00eda dispone de anchos de banda configurables y no cerrados y existen equipos para diversas bandas de frecuencias.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">&nbsp;<\/p>\n<div id=\"attachment_13350\" class=\"wp-caption aligncenter\" style=\"width: 553px; padding: 0px; margin: 0px;\"><a href=\"http:\/\/blogcmt.com\/wp-content\/uploads\/2010\/05\/wimax1.png\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\"><img decoding=\"async\" class=\"size-full wp-image-13350\" src=\"http:\/\/blogcmt.com\/wp-content\/uploads\/2010\/05\/wimax1.png\" alt=\"Arquitectura de red WiMAX\" style=\"padding-top: 3px; padding-right: 0px; padding-bottom: 3px; padding-left: 0px; margin: 0px; border: initial none initial;\" height=\"326\" width=\"543\" \/><\/a> <\/p>\n<p class=\"wp-caption-text\" style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; font: normal normal normal 0.75em\/normal Arial, Helvetica, Geneva, sans-serif; color: #999999; font-weight: bold; margin: 0px;\">Arquitectura de red WiMAX<\/p>\n<\/p><\/div>\n<ul style=\"margin-top: 1px; margin-right: 5px; margin-bottom: 7px; margin-left: 15px; list-style-type: square; list-style-position: initial; list-style-image: initial; text-align: justify; padding: 5px;\">\n<li style=\"margin-top: 0px; margin-right: 0px; margin-bottom: 3px; margin-left: 0px; padding: 0px;\">\n<div style=\"text-align: left; padding: 0px; margin: 0px;\"><strong style=\"padding: 0px; margin: 0px;\">Tipos de WiMAX<\/strong><\/div>\n<\/li>\n<\/ul>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">El&nbsp;<strong style=\"padding: 0px; margin: 0px;\">WiMAX fijo <\/strong>emplea las bandas de frecuencias de 3,5 GHz (uso privativo) y 5,8 GHz . Generalmente dispone de una capacidad por usuario de 512 kbps-4 Mbps, un radio de cobertura de hasta 50 km y emplea antenas directivas (puntos de acceso fijos) de alta ganancia. Se utiliza habitualmente para dar servicios de telefon\u00eda (POTS) e Internet de banda ancha a los usuarios.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">El&nbsp;<strong style=\"padding: 0px; margin: 0px;\">WiMAX m\u00f3vil<\/strong> constituye una evoluci\u00f3n de su versi\u00f3n fija para dar servicios de banda ancha m\u00f3vil y proporcionar la gesti\u00f3n de movilidad. Utiliza las bandas de frecuencias de 2,3 GHz (que no est\u00e1 disponible en Espa\u00f1a), 2,5 GHz (ya est\u00e1 siendo utilizada en los principales pa\u00edses europeos para desarrollar redes m\u00f3viles 4G con tecnolog\u00eda LTE) y de 3,5 GHz. El WiMAX m\u00f3vil presenta velocidades y \u00e1reas de cobertura inferiores respecto a las disponibles para los terminales \u201cfijos\u201d. Entre los pa\u00edses que est\u00e1n haciendo una apuesta m\u00e1s fuerte por esta tecnolog\u00eda destacan Corea del Sur con su sistema WiBro,&nbsp; y&nbsp; EEUU donde las compa\u00f1\u00edas Clearwire y Sprint ya han iniciado la explotaci\u00f3n comercial del WiMAX II&nbsp;(nueva version del WiMAX que permite conexiones de&nbsp;hasta&nbsp;300 Mbps)&nbsp;en diferentes ciudades estadounidenses.<\/p>\n<h3 style=\"margin-top: 1em; margin-right: 0px; margin-bottom: -0.5em; margin-left: 0px; padding-top: 1em; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; font-size: 1em; text-transform: uppercase; letter-spacing: normal; color: #34353e; border-bottom-width: initial; border-bottom-style: none; border-bottom-color: initial; clear: both; text-align: justify;\">REDES EN BANDAS DE USO COM\u00daN: WIFI<\/h3>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">Las redes wifi se basan en la&nbsp; tecnolog\u00eda de transmisi\u00f3n de datos sin hilos y su objetivo principal es la conexi\u00f3n de dispositivos pr\u00f3ximos entre s\u00ed (distancias de 100-300 metros) a altas velocidades equiparables a las de una red cableada. La conexiones wifi utilizan las bandas de uso com\u00fan (no requieren licencia y su potencia es limitada) de 2,4 GHz y 5 GHz y operan en el el conjunto de estandares 802.11.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">En la banda de 2,4 GHz operan los est\u00e1ndares wifi&nbsp; que incorporaban la mayor\u00eda de los routers dom\u00e9sticos ya que este canal est\u00e1 disponible casi internacionalmente, con una velocidad que oscila entre los 11 y 54 Mbps.&nbsp;&nbsp;En estos momentos,&nbsp;el est\u00e1ndar wifi que se est\u00e1 implementando en la mayor\u00eda de los routers dom\u00e9sticos&nbsp;es el IEEE 802.11 n que opera en la banda de 5 GHz. Este canal no presenta apenas interferencias ya que no se comparte con otras tecnolog\u00edas inal\u00e1mbricas (bluetooth, microondas, Zigbe..,),&nbsp;y alcanza velocidades de transmisi\u00f3n de 100 a 300 Mbps.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">A continuaci\u00f3n incluimos un cuadro con la clasificaci\u00f3n de los est\u00e1ndares wifi y sus caracter\u00edsticas:<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\"><a href=\"http:\/\/blogcmt.com\/wp-content\/uploads\/2010\/05\/cuadro-wifi1.png\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-13352\" src=\"http:\/\/blogcmt.com\/wp-content\/uploads\/2010\/05\/cuadro-wifi1.png\" style=\"padding-top: 3px; padding-right: 0px; padding-bottom: 3px; padding-left: 0px; max-width: 500px; margin: 0px; border: initial none initial;\" height=\"221\" width=\"787\" \/><\/a><\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">&nbsp;<\/p>\n<ul style=\"margin-top: 1px; margin-right: 5px; margin-bottom: 7px; margin-left: 15px; list-style-type: square; list-style-position: initial; list-style-image: initial; text-align: justify; padding: 5px;\">\n<li style=\"margin-top: 0px; margin-right: 0px; margin-bottom: 3px; margin-left: 0px; padding: 0px;\">Aplicaciones de las redes wifi<\/li>\n<\/ul>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">En los \u00faltimos a\u00f1os,&nbsp; las conexiones v\u00eda wifi han ido extendi\u00e9ndose a un mayor n\u00famero de \u00e1mbitos y cada vez son m\u00e1s los dispositivos compatibles con esta tecnolog\u00eda inalambrica. Actualmente, las redes inal\u00e1mbricas de \u00e1rea local se emplean para dar acceso a Internet en los siguientes casos:<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\"><strong style=\"padding: 0px; margin: 0px;\">&#8211;&nbsp;Red interna<\/strong>:<strong style=\"padding: 0px; margin: 0px;\"> <\/strong>Por ejemplo, &nbsp;en una empresa es posible acceder a la red corporativa mediante un acceso wifi o con un acceso cableado. Asimismo, en un domicilio particular se crea una red wifi para conectar varios ordenadores a un modem ADSL.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">&#8211;<strong style=\"padding: 0px; margin: 0px;\">Provisi\u00f3n de acceso: <\/strong>El acceso a Internet wifi en el hall de un hotel o e una aeropuerto a trav\u00e9s del port\u00e1til o de un smartphone.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\"><strong style=\"padding: 0px; margin: 0px;\">-Red wifi municipal:<\/strong> A diferencia de las anteriores,&nbsp;estas&nbsp;redes&nbsp;implican el despliegue de un elevado numero de puntos de acceso interconectados entre si (red mallada). En Espa\u00f1a, cada vez son mas los ayuntamientos que apuestan por dar este servicio a sus ciudadanos. Hace unos meses ya dedicamos un post (<a href=\"http:\/\/blogcmt.com\/2010\/04\/12\/redes-de-telecos-y-wifi-una-propuesta-de-regulacion-para-las-aa-pp\/\" target=\"_blank\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\" rel=\"noopener noreferrer\">\u201cRedes de telecos (y wifi), una propuesta de regulaci\u00f3n para las AA PP\u201d<\/a>)para&nbsp;explicaros&nbsp;cu\u00e1les eran las&nbsp;condiciones&nbsp;para la explotaci\u00f3n de redes wifi y&nbsp; la prestaci\u00f3n de servicios de comunicaciones electr\u00f3nicas por parte de las<strong style=\"padding: 0px; margin: 0px;\">Administraciones P\u00fablicas (AA PP)<\/strong>.<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\"><a href=\"http:\/\/blogcmt.com\/wp-content\/uploads\/2010\/05\/arquitecturawifi.png\" style=\"color: #6699cc; text-decoration: none; outline-style: none; outline-width: initial; outline-color: initial; padding: 0px; margin: 0px; border: initial none initial;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-13353\" src=\"http:\/\/blogcmt.com\/wp-content\/uploads\/2010\/05\/arquitecturawifi.png\" style=\"padding-top: 3px; padding-right: 0px; padding-bottom: 3px; padding-left: 0px; max-width: 500px; margin: 0px; border: initial none initial;\" height=\"332\" width=\"571\" \/><\/a><\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">&nbsp;<\/p>\n<p style=\"padding-top: 5px; padding-right: 0px; padding-bottom: 5px; padding-left: 0px; text-align: justify; margin: 0px;\">Fuente:&nbsp;<a href=\"http:\/\/blogcmt.com\/2010\/05\/28\/conceptos-basicos-de-telecos-redes-inalambricas-fijas-y-en-bandas-de-uso-comun\/\">http:\/\/blogcmt.com\/2010\/05\/28\/conceptos-basicos-de-telecos-redes-inalambricas-fijas-y-en-bandas-de-uso-comun\/<\/a><\/p>\n<div>&nbsp;<\/div>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>28 mayo 2010 |&nbsp;inmaguerra | 5 Comentarios &nbsp; Como ya os prometimos&nbsp;en el post anterior&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rs_blank_template":"","rs_page_bg_color":"","slide_template_v7":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-38000","post","type-post","status-publish","format-standard","hentry","category-sin-categoria"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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