[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.dpress.cz\/co-vlastne-znamena-vyraz-wi-fi\/#Article","mainEntityOfPage":"https:\/\/www.dpress.cz\/co-vlastne-znamena-vyraz-wi-fi\/","headline":"Co vlastn\u011b znamen\u00e1 v\u00fdraz Wi-Fi?","name":"Co vlastn\u011b znamen\u00e1 v\u00fdraz Wi-Fi?","description":"Wi-Fi nen\u00ed novodob\u00fdm fenom\u00e9nem, jak se mnoz\u00ed z\u00a0v\u00e1s domn\u00edvaj\u00ed. Souvis\u00ed toti\u017e s\u00a0principem n\u00e1hodn\u00e9 prom\u011bnlivosti frekvenc\u00ed kan\u00e1l\u016f pro vys\u00edl\u00e1n\u00ed r\u00e1diov\u00fdch vln v\u00a0pr\u016fb\u011bhu druh\u00e9 sv\u011btov\u00e9 v\u00e1lky. V\u00a0roce 1942, tedy v\u00a0dob\u011b, kdy je\u0161t\u011b hitlerovsk\u00e9 N\u011bmecko ovl\u00e1dalo v\u011bt\u0161inu Evropy a st\u00e1lo p\u0159ed branami rusk\u00e9 metropole, se George Antheil a Hedy Lamarr rozhodli nechat potvrdit patent na st\u0159\u00edd\u00e1n\u00ed frekvenc\u00ed proti […]","datePublished":"2025-03-06","dateModified":"2023-04-28","author":{"@type":"Person","@id":"https:\/\/www.dpress.cz\/author\/#Person","name":"dpress.cz\n","url":"https:\/\/www.dpress.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/a4f7f6499f3b2a0764d0773f1f5d74780987cfbea7e736c0e74f6185bb257971?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/a4f7f6499f3b2a0764d0773f1f5d74780987cfbea7e736c0e74f6185bb257971?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"dpress.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.dpress.cz\/wp-content\/uploads\/img_a309510_w1919_t1520463430.jpg","url":"https:\/\/www.dpress.cz\/wp-content\/uploads\/img_a309510_w1919_t1520463430.jpg","height":0,"width":0},"url":"https:\/\/www.dpress.cz\/co-vlastne-znamena-vyraz-wi-fi\/","about":["Www"],"wordCount":446,"articleBody":"Wi-Fi nen\u00ed novodob\u00fdm fenom\u00e9nem, jak se mnoz\u00ed z\u00a0v\u00e1s domn\u00edvaj\u00ed. Souvis\u00ed toti\u017e s\u00a0principem n\u00e1hodn\u00e9 prom\u011bnlivosti frekvenc\u00ed kan\u00e1l\u016f pro vys\u00edl\u00e1n\u00ed r\u00e1diov\u00fdch vln v\u00a0pr\u016fb\u011bhu druh\u00e9 sv\u011btov\u00e9 v\u00e1lky. V\u00a0roce 1942, tedy v\u00a0dob\u011b, kdy je\u0161t\u011b hitlerovsk\u00e9 N\u011bmecko ovl\u00e1dalo v\u011bt\u0161inu Evropy a st\u00e1lo p\u0159ed branami rusk\u00e9 metropole, se George Antheil a Hedy Lamarr rozhodli nechat potvrdit patent na st\u0159\u00edd\u00e1n\u00ed frekvenc\u00ed proti nasazen\u00ed odru\u0161ov\u00e1n\u00ed r\u00e1diem \u0159\u00edzen\u00fdch torp\u00e9d ponorek a torp\u00e9doborc\u016f.\tWi-Fi s\u00edt\u011b vyu\u017e\u00edvala arm\u00e1da v\u00edce ne\u017e dvacet letTato technologie se pou\u017e\u00edvala i v\u00a060. letech pro p\u0159enos dat v\u00a0americk\u00e9 n\u00e1mo\u0159n\u00ed flotile a pro arm\u00e1dn\u00ed \u00fa\u010dely se b\u011b\u017en\u011b u\u017e\u00edvala a\u017e do konce 70. let. V\u00a0roce 1981 se poprv\u00e9 objevila i v\u00a0civiln\u00edm sektoru. Technick\u00fd standard frekven\u010dn\u00edho spektra Wi-Fi byl poprv\u00e9 stanoven v\u00a0roce 1997 a byl zn\u00e1m jako IEEE 802.11. O dva roky pozd\u011bji vznikla organizace Wireless Ethernet Compatibility Alliance (zkr\u00e1cen\u011b WECA), kter\u00e1 ji\u017e v\u0161em v\u00fdrobc\u016fm za\u0159\u00edzen\u00ed na b\u00e1zi standardizovan\u00e9 typologie p\u0159id\u011blovala opr\u00e1vn\u011bn\u00ed vyu\u017e\u00edvat zn\u00e1m\u00e9 \u010dernob\u00edl\u00e9 logo Wi-Fi.V\u00a0sou\u010dasn\u00e9 dob\u011b v\u011bt\u0161ina za\u0159\u00edzen\u00ed pracuje na standardech 802.11g, kter\u00fd je zn\u00e1m od roku 2003, mimo to se v\u00a0za\u0159\u00edzen\u00edch objevuje koncov\u00e9 p\u00edsmeno standardu \u201en\u201c s\u00a0podporou v\u00edcen\u00e1sobn\u00e9ho v\u00fdstupu i vstupu pro zv\u00fd\u0161en\u00ed propustnosti. Od roku 2013 se pou\u017e\u00edvaj\u00ed tak\u00e9 standardy \u201eac\u201c a \u201ead\u201c.\tBezlicen\u010dn\u00ed p\u00e1smo je z\u00e1kladem pr\u00e1ce Wi-FiWi-Fi s\u00edt\u011b pracuj\u00ed v\u00a0ur\u010dit\u00e9m p\u0159esn\u011b vymezen\u00e9m frekven\u010dn\u00edm rozmez\u00ed, je to proto, aby byli provozovatel\u00e9 chr\u00e1n\u011bni p\u0159ed t\u011bmi dal\u0161\u00edmi, kte\u0159\u00ed pracuj\u00ed v\u00a0p\u00e1smech r\u00e1diov\u00fdch vln. Z\u00a0toho d\u016fvodu bylo p\u0159id\u011bleno t\u011bmto za\u0159\u00edzen\u00edm tzv. bezlicen\u010dn\u00ed p\u00e1smo (ona zn\u00e1m\u00e1 frekvence 2,4 GHz.) Po\u010det frekvenc\u00ed je ve skute\u010dnosti omezen\u00fd sv\u00fdm rozsahem, mimochodem, n\u011bkter\u00e9 r\u00e1diov\u00e9 zdroje v\u00a0dom\u00e1cnosti tak\u00e9 pracuj\u00ed na podobn\u00e9m principu, nap\u0159. mikrovlnn\u00e1 trouba. Ka\u017edop\u00e1dn\u011b v\u0161ichni v\u00fdrobci a provozovatel\u00e9 Wi-FI mus\u00ed dodr\u017eovat ustanoven\u00ed \u010cesk\u00e9ho telekomunika\u010dn\u00edho \u00fa\u0159adu.V\u0161echny bezdr\u00e1tov\u00e9 komunikace pracuj\u00ed bu\u010f skryt\u011b, nebo viditeln\u011b, co\u017e znamen\u00e1 vys\u00edl\u00e1n\u00ed tzv. Service Set Identifieru (SSID). Je to sled znak\u016f ASCII (a\u017e 32 znak\u016f) a tento identifika\u010dn\u00ed lok\u00e1tor je viditeln\u00fd jako dostupn\u00e1 s\u00ed\u0165. Klient se pak k\u00a0n\u00ed m\u016f\u017ee p\u0159ipojit, pokud zn\u00e1 p\u0159\u00edslu\u0161n\u00e9 identifika\u010dn\u00ed \u00fadaje.                                                                                                                                                                                                                                                                                                                                                                                        4.1\/5 - (10 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Co vlastn\u011b znamen\u00e1 v\u00fdraz Wi-Fi?","item":"https:\/\/www.dpress.cz\/co-vlastne-znamena-vyraz-wi-fi\/#breadcrumbitem"}]}]