{"id":104,"date":"2001-04-08T17:45:30","date_gmt":"2001-04-08T17:45:30","guid":{"rendered":"https:\/\/satelit.cz\/?p=104"},"modified":"2001-04-08T17:45:30","modified_gmt":"2001-04-08T17:45:30","slug":"bezdratovy-prenos-dat-ii","status":"publish","type":"post","link":"https:\/\/satelit.cz\/?p=104","title":{"rendered":"Bezdr\u00e1tov\u00fd p\u0159enos dat II."},"content":{"rendered":"<p><img decoding=\"async\" src=\"http:\/\/www.proxim.cz\/produkty\/images\/sympci.jpg\" align=\"left\">Ji\u017e del\u0161\u00ed dobou se zab\u00fdv\u00e1m probl\u00e9mem jak zajistit bezdr\u00e1tov\u00fd p\u0159enos dat na vzd\u00e1lenosti cca 1km. V p\u0159ede\u0161l\u00e9m \u010dl\u00e1nku <a href=\"http:\/\/www.satelit.cz\/article.php?sid=11\">o bezdr\u00e1tov\u00e9m p\u0159enosu dat<\/a> jsem V\u00e1s sezn\u00e1mil s moduly Radiometrix a bezdr\u00e1tov\u00fdm modemem firmy Siemens M101Data. B\u011bhem doby od naps\u00e1n\u00ed tohoto \u010dl\u00e1nku se na trhu s bezdr\u00e1tov\u00fdmi produkty objevila cel\u00e1 \u0159ada dal\u0161\u00edch za\u0159\u00edzen\u00ed.<br \/>\nPo p\u0159ibli\u017en\u011b dvoulet\u00e9m provozu syst\u00e9mu M101Data, jsem se za\u010dal pot\u00fdkat s probl\u00e9mem nedostate\u010dn\u00e9 kapacity spoje, kter\u00e1 byla 115kbit\/s. Za\u010dal jsem tedy hledat jak\u00fd modern\u011bj\u0161\u00ed, homologovan\u00fd a cenov\u011b p\u0159ijateln\u00fd prost\u0159edek, bych mohl vyu\u017e\u00edt m\u00edsto t\u011bchto modem\u016f. Z po\u010d\u00e1tku hled\u00e1n\u00ed jsem si stanovil n\u011bkter\u00e9 c\u00edle, kter\u00e9 jsem cht\u011bl p\u0159i v\u00fdb\u011bru karty dodr\u017eet. <br \/>1. Cel\u00e9 za\u0159\u00edzen\u00ed mus\u00ed b\u00fdt homologov\u00e1no<br \/>2. Cena mus\u00ed b\u00fdt p\u0159\u00edstupn\u00e1 i pro b\u011b\u017en\u00e9ho dom\u00e1c\u00edho u\u017eivatele, proto odpadl favorit firmy Breezcom<br \/>3. Implementace do v\u0161ech opera\u010dn\u00edch syst\u00e9m\u016f mus\u00ed b\u00fdt jednoduch\u00e1<\/p>\n<p>P\u0159i sv\u00e9m hled\u00e1n\u00ed jsem narazil na detailn\u011b zpracovanou <a href=\"http:\/\/linux.mikroservis.cz\/mikrovlny.html\">str\u00e1nku<\/a> jedn\u00e9 spole\u010dnosti, kter\u00e1 otestovala celou \u0159adu bezdr\u00e1tov\u00fdch s\u00ed\u0165ov\u00fdch produkt\u016f. Prvn\u00ed co m\u011b zaujalo, byly karty z produkce firmy PLANET, ale bohu\u017eel tento syst\u00e9m pracuje jako DSS co\u017e mi nevyhovuje. Dal\u0161\u00ed volba tedy padla na kartu PROXIM &#8211; Symphony pracuj\u00edc\u00ed syst\u00e9mem FHSS (rozprost\u0159en\u00e9 spektrum s p\u0159eskakuj\u00edc\u00ed frekvenc\u00ed). Jedn\u00e1 se o velice modern\u00ed technologii, kter\u00e1 byla vyvinuta jako levn\u00fd klon technologie PROXIM &#8211; RangeLAN s n\u011bkolika mal\u00fdmi omezen\u00edmi. <img decoding=\"async\" src=\"http:\/\/www.proxim.cz\/produkty\/images\/symbridge.jpg\" align=\"right\">Nejv\u011bt\u0161\u00edm z nich je nastaven\u00ed nulov\u00e9ho PNP ID, \u010d\u00edm\u017e do\u0161lo k teoretick\u00e9mu omezen\u00ed pou\u017eit\u00ed jedn\u00e9 karty v jednom po\u010d\u00edta\u010di. Toto omezen\u00ed je p\u0159ev\u00e1\u017en\u011b pro routery, kde je pot\u0159eba pou\u017e\u00edt v\u00edce bezdr\u00e1tov\u00fdch rozhran\u00ed najednou, na\u0161t\u011bst\u00ed v\u0161ak lze toto omezen\u00ed o\u0161\u00e1lit pou\u017eit\u00edm jedn\u00e9 karty typu PCI a jedn\u00e9 typu ISA. Dal\u0161\u00ed omezen\u00ed pro router v opera\u010dn\u00edm syst\u00e9mu Windows je vz\u00e1jemn\u00e1 komunikace pouze s deseti klienty, ale s t\u00edmto jsem se nesetkal, proto\u017ee jako router pou\u017e\u00edv\u00e1n syst\u00e9m linux jeho\u017e ovlada\u010d pro Symphony nen\u00ed takto omezen. \u0158ada Symhony obsahuje je\u0161t\u011b kartu v proveden\u00ed PCMCIA pro pou\u017eit\u00ed ve Va\u0161em p\u0159enosn\u00e9m za\u0159\u00edzen\u00ed, kter\u00e9 pot\u0159ebujete m\u00edt p\u0159ipojeno k Va\u0161\u00ed s\u00edti a Ethernet Bridge. To je op\u011bt velice zaj\u00edmav\u00e9 za\u0159\u00edzen\u00ed, kter\u00e9 je do s\u00edt\u011b p\u0159ipojeno p\u0159\u00edmo ethernet rozhran\u00edm a administraci lze prov\u00e1d\u011bt na d\u00e1lku. Bohu\u017eel cena je vy\u0161\u0161\u00ed a tak se to v\u017edy pokud to jde san\u017e\u00edm \u0159e\u0161it po\u010d\u00edta\u010dem s kartou. Praktick\u00e1 p\u0159enosov\u00e1 rychlost se pohybuje kolem 400 kbit\/s v jednom sm\u011bru co\u017e nen\u00ed zrovna mnoho, ale je t\u0159eba si uv\u011bdomit, \u017ee spoj postav\u00edme za 2 * 4890,- K\u010d + DPH.<\/p>\n<p>Na z\u00e1v\u011br je\u0161t\u011b parametry ud\u00e1van\u00e9 v\u00fdrobcem :<\/p>\n<p>Frekven\u010dn\u00ed p\u00e1smo: 2,4GHz <br \/>\nTyp: FHSS (rozprost\u0159en\u00e9 spektrum s p\u0159eskakuj\u00edc\u00ed frekvenc\u00ed) <br \/>\nV\u00fdkon: 100mW <br \/>\nAnt\u00e9ny: PCMCIA karta &#8211; integrovan\u00e1 Snap-On (0dBi)<br \/>\nISA karta \u2013 v\u0161esm\u011brov\u00e1 ant\u00e9na (1dBi)<br \/>\nEthernet Bridge \u2013 v\u0161esm\u011brov\u00e1 ant\u00e9na (1dBi) <br \/>\nDosah: 50m v kancel\u00e1\u0159sk\u00e9m prost\u0159ed\u00ed, 150m v otev\u0159en\u00e9m prostoru<br \/>\n(s dipolovou ant\u00e9nou 1dB) <br \/>\nP\u0159enosov\u00e1 rychlost: 1,6 Mbps, automatick\u00fd fallback na 800kbps <br \/>\nOvlada\u010de: Windows 95\/98 <br \/>\nBezpe\u010dnost: 20-ti znakov\u00fd bezpe\u010dnostn\u00ed k\u00f3d, k\u00f3dov\u00e1n\u00ed p\u0159en\u00e1\u0161en\u00fdch dat <br \/>\nMax. po\u010det klient\u016f s\u00edt\u011b: 10 <br \/>\nCertifikace FCC, \u010cT\u00da <br \/>\nZ\u00e1ruka: 1 rok <br \/>\nCeny :<br \/>\nISA, PCI karta 4890,- + DPH<br \/>\nPCMCIA karta 5500,- + DPH<br \/>\nEthernet Bridge 15 900,- + DPH<\/p>\n<p>Pokud m\u00e1te z\u00e1jem o dod\u00e1vku za\u0159\u00edzen\u00ed PROXIM, kontaktujte m\u011b <a href=\"mailto:vasek@satelit.cz\">emailem<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ji\u017e del\u0161\u00ed dobou se zab\u00fdv\u00e1m probl\u00e9mem jak zajistit bezdr\u00e1tov\u00fd p\u0159enos dat na vzd\u00e1lenosti cca 1km. V p\u0159ede\u0161l\u00e9m \u010dl\u00e1nku o bezdr\u00e1tov\u00e9m p\u0159enosu dat jsem V\u00e1s sezn\u00e1mil s moduly Radiometrix a bezdr\u00e1tov\u00fdm modemem firmy Siemens M101Data. B\u011bhem doby od naps\u00e1n\u00ed tohoto \u010dl\u00e1nku se na trhu s bezdr\u00e1tov\u00fdmi produkty objevila cel\u00e1 \u0159ada dal\u0161\u00edch za\u0159\u00edzen\u00ed. Po p\u0159ibli\u017en\u011b dvoulet\u00e9m provozu&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-104","post","type-post","status-publish","format-standard","hentry","category-kontrukce-tipy-bastleni"],"_links":{"self":[{"href":"https:\/\/satelit.cz\/index.php?rest_route=\/wp\/v2\/posts\/104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/satelit.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/satelit.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/satelit.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/satelit.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=104"}],"version-history":[{"count":0,"href":"https:\/\/satelit.cz\/index.php?rest_route=\/wp\/v2\/posts\/104\/revisions"}],"wp:attachment":[{"href":"https:\/\/satelit.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=104"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/satelit.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=104"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/satelit.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}