{"id":480,"date":"2012-11-17T11:20:50","date_gmt":"2012-11-17T13:20:50","guid":{"rendered":"http:\/\/efagundes.com\/openclass_networking\/?page_id=480"},"modified":"2022-01-16T17:51:14","modified_gmt":"2022-01-16T20:51:14","slug":"multiplexacao-por-divisao-de-frequencia","status":"publish","type":"page","link":"https:\/\/efagundes.com\/networking\/multiplexacao-2\/multiplexacao-por-divisao-de-frequencia\/","title":{"rendered":"Multiplexa\u00e7\u00e3o por divis\u00e3o de frequ\u00eancia"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide217.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"2488\" data-permalink=\"https:\/\/efagundes.com\/networking\/multiplexacao-2\/multiplexacao\/slide2-6\/\" data-orig-file=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide217.jpg?fit=960%2C720&amp;ssl=1\" data-orig-size=\"960,720\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Slide2\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide217.jpg?fit=960%2C720&amp;ssl=1\" class=\"alignnone size-full wp-image-2488\" src=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide217.jpg?resize=960%2C720\" alt=\"Slide2\" width=\"960\" height=\"720\" srcset=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide217.jpg?w=960&amp;ssl=1 960w, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide217.jpg?resize=300%2C225&amp;ssl=1 300w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/a><\/p>\n<p>A figura mostra como tr\u00eas canais telef\u00f4nicos de n\u00edvel de voz s\u00e3o multiplexados com o uso da FDM. Os filtros limitam a largura de banda utiliz\u00e1vel a cerca de 3.100 Hz por canal de qualidade de voz. Quando muitos canais s\u00e3o multiplexados ao mesmo tempo, s\u00e3o alocados 4.000 Hz para cada canal, a fim de mant\u00ea-los bem separados. Primeiro, os canais de voz t\u00eam sua freq\u00fc\u00eancia aumentada, cada qual com um valor diferente. Depois eles podem ser combinados, pois agora n\u00e3o h\u00e1 dois canais ocupando a mesma por\u00e7\u00e3o do espectro. Observe que, apesar de haver intervalos (bandas de prote\u00e7\u00e3o) entre os canais, h\u00e1 uma certa sobreposi\u00e7\u00e3o entre canais adjacentes, porque os filtros n\u00e3o t\u00eam limites n\u00edtidos. Essa sobreposi\u00e7\u00e3o significa que um forte pico no limite de um canal ser\u00e1 sentido no canal adjacente como ru\u00eddo n\u00e3o t\u00e9rmico.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A figura mostra como tr\u00eas canais telef\u00f4nicos de n\u00edvel de voz s\u00e3o multiplexados com o uso da FDM. Os filtros limitam a largura de banda utiliz\u00e1vel a cerca de 3.100 Hz por canal de qualidade de voz. Quando muitos canais s\u00e3o multiplexados ao mesmo tempo, s\u00e3o alocados 4.000 Hz para cada canal, a fim de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1333,"menu_order":5,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-480","page","type-page","status-publish","hentry"],"jetpack_shortlink":"https:\/\/wp.me\/P8yKGp-7K","jetpack-related-posts":[{"id":488,"url":"https:\/\/efagundes.com\/networking\/multiplexacao-2\/multiplexacao-por-divisao-de-tempo-3\/","url_meta":{"origin":480,"position":0},"title":"Multiplexa\u00e7\u00e3o por divis\u00e3o de tempo (III)","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"A multiplexa\u00e7\u00e3o por divis\u00e3o de tempo permite que v\u00e1rias portadoras T1\/E1 sejam multiplexadas em portadoras de ordem mais alta. A figura mostra como isso pode ser feito. \u00c0 esquerda, vemos quatro canais T1 sendo multiplexados em um canal T2. A multiplexa\u00e7\u00e3o T2 e acima dele \u00e9 feita bit a bit,\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide6","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide65.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide65.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide65.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide65.jpg?resize=700%2C400 2x"},"classes":[]},{"id":498,"url":"https:\/\/efagundes.com\/networking\/multiplexacao-2\/sdh-estrutura-do-frame\/","url_meta":{"origin":480,"position":1},"title":"SDH &#8211; Estrutura do frame","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"\u00a0 A hierarquia SDH foi concebida para uma arquitetura de multiplexa\u00e7\u00e3o s\u00edncrona. Cada canal opera com um rel\u00f3gio sincronizado com os rel\u00f3gios dos outros canais, e \u00e9 sincronizado com o equipamento multiplex atrav\u00e9s de um processo de justifica\u00e7\u00e3o de bit e encapsulamento da informa\u00e7\u00e3o (cont\u00eainer). A esse cont\u00eainer \u00e9 adicionado\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide11","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide119.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide119.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide119.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide119.jpg?resize=700%2C400 2x"},"classes":[]},{"id":484,"url":"https:\/\/efagundes.com\/networking\/multiplexacao-2\/multiplexacao-por-divisao-de-tempo\/","url_meta":{"origin":480,"position":2},"title":"Multiplexa\u00e7\u00e3o por divis\u00e3o de tempo (I)","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"A multiplexa\u00e7\u00e3o por divis\u00e3o de tempo (TDM) pode ser inteiramente manipulada por circuitos eletr\u00f4nicos digitais; portanto, ela se tornou muito mais difundida nos \u00faltimos anos. Ela s\u00f3 pode ser utilizada para dados digitais. Como os loops locais s\u00e3o anal\u00f3gicos, uma convers\u00e3o de anal\u00f3gico para digital \u00e9 necess\u00e1ria na esta\u00e7\u00e3o final,\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide4","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide45.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide45.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide45.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide45.jpg?resize=700%2C400 2x"},"classes":[]},{"id":440,"url":"https:\/\/efagundes.com\/networking\/sistema-de-telefonia-movel\/amps\/","url_meta":{"origin":480,"position":3},"title":"AMPS","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"A primeira Gera\u00e7\u00e3o de Sistemas Celulares, formada por sistemas anal\u00f3gicos, estabeleceu a estrutura e funcionalidades b\u00e1sicas associadas a estes sistemas como roaming e handover entre c\u00e9lulas. O AMPS (Advanced Mobile Phone System) desenvolvido pelo Bell Labs nos Estados Unidos (1979) entrou em opera\u00e7\u00e3o naquele pa\u00eds em 1983 tornando-se o sistema\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide23","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide233.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide233.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide233.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide233.jpg?resize=700%2C400 2x"},"classes":[]},{"id":240,"url":"https:\/\/efagundes.com\/networking\/teoria-da-transmissao-e-meios-magneticos\/sinais-limitados-pela-largura-de-banda-i\/","url_meta":{"origin":480,"position":4},"title":"Sinais limitados pela largura de banda (I)","author":"Eduardo Fagundes","date":"16\/11\/2012","format":false,"excerpt":"Nenhum recurso de transmiss\u00e3o \u00e9 capaz de transmitir sinais sem perder parte da energia no processo. Se todos os coeficientes da s\u00e9rie de Fourier fossem igualmente reduzidos, o sinal resultante seria reduzido em amplitude, mas n\u00e3o seria distorcido. 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