{"id":293,"date":"2012-11-16T22:30:41","date_gmt":"2012-11-17T00:30:41","guid":{"rendered":"http:\/\/efagundes.com\/openclass_networking\/?page_id=293"},"modified":"2022-01-16T17:50:14","modified_gmt":"2022-01-16T20:50:14","slug":"emissor-de-sinal","status":"publish","type":"page","link":"https:\/\/efagundes.com\/networking\/fibra-optica-2\/emissor-de-sinal\/","title":{"rendered":"Emissor de sinal"},"content":{"rendered":"<p><a href=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide271.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"2414\" data-permalink=\"https:\/\/efagundes.com\/networking\/fibra-optica-2\/emissor-de-sinal\/slide27-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide271.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=\"Slide27\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide271.jpg?fit=960%2C720&amp;ssl=1\" class=\"alignnone size-full wp-image-2414\" src=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide271.jpg?resize=960%2C720\" alt=\"Slide27\" width=\"960\" height=\"720\" srcset=\"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide271.jpg?w=960&amp;ssl=1 960w, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide271.jpg?resize=300%2C225&amp;ssl=1 300w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":1329,"menu_order":3,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-293","page","type-page","status-publish","hentry"],"jetpack_shortlink":"https:\/\/wp.me\/P8yKGp-4J","jetpack-related-posts":[{"id":653,"url":"https:\/\/efagundes.com\/networking\/lans-sem-fio\/802-11-o-protocolo-da-subcamada-mac\/","url_meta":{"origin":293,"position":0},"title":"802.11: o protocolo da subcamada MAC (I)","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"\u00a0 O protocolo da subcamada MAC do 802.11 \u00e9 bastante diferente do protocolo da Ethernet, devido \u00e0 complexidade inerente do ambiente sem fio, em compara\u00e7\u00e3o com o de um sistema fisicamente conectado. O protocolo come\u00e7a quando A decide transmitir dados para B. O emissor pode emitir um RTS (request to\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide180","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide180.png?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide180.png?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide180.png?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide180.png?resize=700%2C400 2x"},"classes":[]},{"id":1086,"url":"https:\/\/efagundes.com\/networking\/lans-sem-fio\/802-11-o-protocolo-da-subcamada-mac-2-2\/","url_meta":{"origin":293,"position":1},"title":"802.11: o protocolo da subcamada MAC (II)","author":"Eduardo Fagundes","date":"19\/11\/2012","format":false,"excerpt":"\u00a0 A taxa de erro de transmiss\u00e3o em Redes sem Fio \u00e9 geralmente muito maior que em redes de fibra \u00f3ptica, por exemplo. Uma maneira de diminuir a probabilidade de erro dos quadros \u00e9 utilizar quadros pequenos. Nesse caso, a taxa de erros na transmiss\u00e3o \u00e9 a mesma, mas somente\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide181","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide181.png?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide181.png?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide181.png?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2012\/11\/Slide181.png?resize=700%2C400 2x"},"classes":[]},{"id":590,"url":"https:\/\/efagundes.com\/networking\/protocolos-elementares-de-enlace-de-dados\/um-protocolo-simplex-stop-and-wait\/","url_meta":{"origin":293,"position":2},"title":"Um protocolo simplex stop-and-wait","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"Esse protocolo de comunica\u00e7\u00e3o ainda livre de erros mas, agora, o receptor tem uma capacidade de consumo limitada. Este fato se deve a uma capacidade de armazenamento limitada e uma velocidade de processamento finita. O emissor deve ent\u00e3o se precaver para n\u00e3o transmitir quadros a uma taxa maior que o\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide126.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide126.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide126.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide126.jpg?resize=700%2C400 2x"},"classes":[]},{"id":593,"url":"https:\/\/efagundes.com\/networking\/protocolos-elementares-de-enlace-de-dados\/um-protocolo-simplex-para-um-canal-com-ruido\/","url_meta":{"origin":293,"position":3},"title":"Um protocolo simplex para um canal com ru\u00eddo","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"Os protocolos simples e stop-and-wait consideram uma linha livre de erros. Entretanto, a realidade mostra que as linhas sempre podem apresentar erros que causam altera\u00e7\u00e3o nos quadros transmitidos ou mesmo perda completa desses quadros. A primeira conseq\u00fc\u00eancia desta realidade \u00e9 a necessidade de sinalizar o nodo emissor que o quadro\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide136.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide136.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide136.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide136.jpg?resize=700%2C400 2x"},"classes":[]},{"id":356,"url":"https:\/\/efagundes.com\/networking\/transmissao-sem-fio\/transmissao-por-ondas-de-luz\/","url_meta":{"origin":293,"position":4},"title":"Transmiss\u00e3o por ondas de luz","author":"Eduardo Fagundes","date":"16\/11\/2012","format":false,"excerpt":"\u00a0 Sinaliza\u00e7\u00e3o \u00f3tica tem sido usada desde h\u00e1 muito tempo. Na marinha j\u00e1 se utilizava sinaliza\u00e7\u00e3o \u00f3tica codificada desde a primeira guerra. Atualmente, uma aplica\u00e7\u00e3o mais apropriada \u00e9 a conex\u00e3o de\u00a0 LANs em edif\u00edcios separados via lasers montados nos tetos. Um transmissor e um receptor de cada lado comp\u00f5em o\u2026","rel":"","context":"Post similar","block_context":{"text":"Post similar","link":""},"img":{"alt_text":"Slide14","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide143.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide143.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide143.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide143.jpg?resize=700%2C400 2x"},"classes":[]},{"id":595,"url":"https:\/\/efagundes.com\/networking\/protocolos-elementares-de-enlace-de-dados\/protocolos-de-janela-deslizante\/","url_meta":{"origin":293,"position":5},"title":"Protocolos de janela deslizante","author":"Eduardo Fagundes","date":"17\/11\/2012","format":false,"excerpt":"Uma janela de transmiss\u00e3o \u00e9, para o emissor, o conjunto de quadro que podem ser enviados independentemente de ter recebido suas confirma\u00e7\u00f5es. Por exemplo, um emissor com janela tamanho N pode enviar desde o quadro 0 at\u00e9 o quadro N-1 sem que tenha recebido confirma\u00e7\u00e3o, no entanto, para enviar o\u2026","rel":"","context":"Com 1 coment\u00e1rio","block_context":{"text":"Com 1 coment\u00e1rio","link":"https:\/\/efagundes.com\/networking\/protocolos-elementares-de-enlace-de-dados\/protocolos-de-janela-deslizante\/#comments"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide146.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide146.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide146.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/efagundes.com\/networking\/wp-content\/uploads\/sites\/5\/2015\/03\/Slide146.jpg?resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/efagundes.com\/networking\/wp-json\/wp\/v2\/pages\/293","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/efagundes.com\/networking\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/efagundes.com\/networking\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/efagundes.com\/networking\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/efagundes.com\/networking\/wp-json\/wp\/v2\/comments?post=293"}],"version-history":[{"count":0,"href":"https:\/\/efagundes.com\/networking\/wp-json\/wp\/v2\/pages\/293\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/efagundes.com\/networking\/wp-json\/wp\/v2\/pages\/1329"}],"wp:attachment":[{"href":"https:\/\/efagundes.com\/networking\/wp-json\/wp\/v2\/media?parent=293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}