Tr\u00e1p\u00ed V\u00e1s ot\u00e1zka bezdr\u00e1tov\u00e9ho p\u0159enosu dat ?<\/p>\n
S roz\u0161i\u0159ov\u00e1n\u00edm Internetu nast\u00e1v\u00e1 ot\u00e1zka vhodn\u00e9ho p\u0159ipojen\u00ed k t\u00e9to s\u00edti. Nap\u0159\u00edklad moje pracovi\u0161t\u011b je do s\u00edt\u011b Internet p\u0159ipojeno pevnou linkou 28,8 a j\u00e1 pot\u0159ebuji m\u00edt z domova p\u0159\u00edstup nejen na Internet, ale i do cel\u00e9 lok\u00e1ln\u00ed firemn\u00ed s\u00edt\u011b.
\nDobrou cestou, pro n\u00e1s slab\u00e9 Linux\u00e1ky, je RAS \u2013 remote access server v bal\u00edku Microsoft NT server. Ten lze vhodn\u011b vyu\u017e\u00edt pro dial-up p\u0159ipojen\u00ed a d\u00e1 se nastavit i jako Call-Back ( to znamen\u00e1, \u017ee si z domova zavol\u00e1te a server v\u00e1m zavol\u00e1 zp\u011bt, aby n\u00e1klady hradil zam\u011bstnavatel). (No jeste me muj kamarad Ruda Griesel upozornil, ze call back je hlavne security funkce a to ze naklady hradi pouze zamestnavatel je jen vec vitana. U me je vitana ze 100 procent :))) Nicm\u00e9n\u011b pro dlouhodob\u00e1 p\u0159ipojen\u00ed se jedn\u00e1 o velmi n\u00e1kladn\u00e9 \u0159e\u0161en\u00ed. Dal\u0161\u00ed mo\u017enost\u00ed je pou\u017eit\u00ed pronajat\u00e9 linky od Telecomu za 1050,- K\u010d m\u011bs\u00ed\u010dn\u011b , ale pokud to mo\u017enosti dovoluj\u00ed, tak lze pou\u017e\u00edt nejlevn\u011bj\u0161\u00ed \u0159e\u0161en\u00ed \u2013 Bezdr\u00e1tov\u00fd p\u0159enos dat. V \u010cesk\u00e9 republice bylo podle \u010cSN ETS 300220 povoleno pou\u017e\u00edv\u00e1n\u00ed radiov\u00fdch stanic s vyz\u00e1\u0159en\u00fdm v\u00fdkonem do ERP = 10 dBm. Proto jsem hledal dodavatele pro vysokofrekven\u010dn\u00ed \u010d\u00e1st, vyhovuj\u00edc\u00ed schv\u00e1len\u00e9 norm\u011b. Touto technikou se zab\u00fdv\u00e1 firma RADIOMETRIX z Anglie. Ale pozor moduly dod\u00e1van\u00e9 touto firmou spl\u0148uj\u00ed uvedenou normu pouze v p\u0159\u00edpad\u011b pou\u017eit\u00ed origin\u00e1ln\u00ed v\u0161esm\u011brov\u00e9 ant\u00e9ny ! V pou\u017eit\u00ed se ziskovou ant\u00e9nou hodnotu ERP p\u0159ekro\u010d\u00edte !<\/p>\n
Vzd\u00e1lenosti na kter\u00e9 je mo\u017eno moduly pou\u017e\u00edvat je prakticky okolo 300 metr\u016f, co\u017e pro moje aplikace nevyhov\u011blo. Proto jsem hledal dal\u0161\u00ed mo\u017enost zv\u00fd\u0161en\u00ed mo\u017en\u00e9ho dosahu spojen\u00ed bez poru\u0161en\u00ed podm\u00ednek dan\u00fdch \u010cSN. \u0158e\u0161en\u00ed je takov\u00e9, \u017ee pou\u017eijete sm\u011brovou YAGI ant\u00e9nu, ale pouze na p\u0159ij\u00edmac\u00ed stran\u011b bezdr\u00e1tov\u00e9 trasy.<\/p>\n
Kmito\u010det pou\u017eit\u00fd pro vysokofrekven\u010dn\u00ed p\u0159enos je nastaven na 433,920 Mhz a spl\u0148uje uvedenou normu. P\u0159enosov\u00e1 rychlost je v\u00fdrobcem ud\u00e1v\u00e1na na 40 kbit\/sec. Zde se jedn\u00e1 o kontinu\u00e1ln\u00ed nepaketovan\u00fd tok dat. Pro pou\u017eit\u00ed pln\u011b duplexn\u00edho re\u017eimu po\u010d\u00edtejte s rychlost\u00ed okolo 16 kbit\/sec. Samoz\u0159ejm\u011b z\u00e1le\u017e\u00ed na vhodn\u00e9 softwarov\u00e9 obsluze, kter\u00e1 m\u016f\u017ee hodn\u011b p\u0159enos urychlit. Nenar\u00e1\u017e\u00edm na kompresi dat, kter\u00e1 by jist\u011b tak\u00e9 hodn\u011b pomohla, ale zde m\u016f\u017eete naj\u00edt \u0159e\u0161en\u00ed v dynamicky p\u0159id\u011blovan\u00e9m pom\u011bru p\u0159ij\u00edman\u00fdch a vys\u00edlan\u00fdch dat. To znamen\u00e1, \u017ee pokud p\u0159istupujete na Internet, tak zat\u00ed\u017een\u00ed linky je p\u0159ibli\u017en\u011b 80 procent toku jde do va\u0161eho po\u010d\u00edta\u010de a z va\u0161eho po\u010d\u00edta\u010de odch\u00e1z\u00ed 20 procent. T\u011bmto po\u017eadavk\u016fm by se m\u011bl obslu\u017en\u00fd software pod\u0159\u00eddit a dostanete se tak na mo\u017enosti b\u011b\u017en\u00e9ho telefonn\u00edho modemu. Samoz\u0159ejm\u011b bez n\u00e1ro\u010dn\u00fdch \u00faprav m\u016f\u017eete moduly pou\u017e\u00edt t\u0159eba pro s\u00e9riovou komunika\u010dn\u00ed linku pro hern\u00ed propojen\u00ed dvou PC, kter\u00e1 je pro konstrukci velmi jednoduch\u00fdm \u0159e\u0161en\u00edm. Jak je vid\u011bt uplatn\u011bn\u00ed se najde na mnoha m\u00edstech, nemluv\u011b o p\u0159enosu analogov\u00e9ho sign\u00e1lu.
\n
\nV \u010cesk\u00e9 republice firmu RADIOMETRIX zastupuje firma :
\n
\nAdvanced Radio Telemetry s.r.o.
\nFrancousk\u00e1 82
\nBRNO<\/p>\n
PS: 2.8.1999<\/p>\n
A proto\u017ee technologie st\u00e1le kr\u00e1\u010d\u00ed kup\u0159edu, je tu nov\u00e1 zku\u0161enost s bezdr\u00e1tov\u00fdm p\u0159enosem dat pomoc\u00ed profesion\u00e1ln\u00edho za\u0159\u00edzen\u00ed.
\n
\nZku\u0161enosti s provozem Siemens Gigaset M101Data
\n<\/p>\n
Ihned po p\u0159e\u010dten\u00ed \u010dl\u00e1nku o tomto p\u0159\u00edstroji na str\u00e1nk\u00e1ch Mobil Serveru jsem zaj\u00e1sal. Kone\u010dn\u011b zaj\u00edmav\u00e9 \u0159e\u0161en\u00ed pro mal\u00e9 a st\u0159edn\u00ed podniky za solidn\u00ed cenu. Proto jsem nev\u00e1hal a za\u010dal jsem se sh\u00e1n\u011bt, kde uveden\u00e9 za\u0159\u00edzen\u00ed vlastn\u011b m\u016f\u017eu zakoupit. Kdy\u017e jsem zavolal do firmy Siemens tak mne odk\u00e1zali na n\u011bkolik prodejc\u016f v m\u00e9m m\u011bst\u011b a opravdu to fungovalo. Za\u0159\u00edzen\u00ed m\u011bli dokonce skladem a tak jsem zaplatil \u010d\u00e1stku 9992,- K\u010d a za\u010dal d\u011blat pokusy. Nejprve jsem nebyl n\u00e1ro\u010dn\u00fd a za\u010dal jsem testovat pouze uvnit\u0159 kancel\u00e1\u0159e. Samoz\u0159ejm\u011b v\u0161e fungovalo bez probl\u00e9m\u016f a tak jsem se vrhnul na v\u011bt\u0161\u00ed vzd\u00e1lenost. A skute\u010dn\u011b to tak\u00e9 fungovalo, pou\u017e\u00edv\u00e1m Gigaset M101 na vzd\u00e1lenost p\u0159ibli\u017en\u011b 250m vzdu\u0161nou \u010darou a tuto vzd\u00e1lenost d\u011bl\u00ed jeden vy\u0161\u0161\u00ed d\u016fm. Pro \u00fasp\u011b\u0161nou komunikaci jsem musel za\u0159\u00edzen\u00ed um\u00edstit do nejvy\u0161\u0161\u00edch pater obou budou za okno, ale st\u00e1le nebyla p\u0159\u00edm\u00e1 viditelnost a v\u0161e funguje bez probl\u00e9m\u016f. Je\u0161t\u011b budu prov\u00e1d\u011bt testy s mo\u017enost\u00ed zv\u00fd\u0161en\u00ed dosahu pomoc\u00ed parabolick\u00fdch ant\u00e9n, kdy nedojde k z\u00e1sahu do za\u0159\u00edzen\u00ed a poru\u0161en\u00ed homologace.<\/p>\n","protected":false},"excerpt":{"rendered":"
Tr\u00e1p\u00ed V\u00e1s ot\u00e1zka bezdr\u00e1tov\u00e9ho p\u0159enosu dat ? S roz\u0161i\u0159ov\u00e1n\u00edm Internetu nast\u00e1v\u00e1 ot\u00e1zka vhodn\u00e9ho p\u0159ipojen\u00ed k t\u00e9to s\u00edti. Nap\u0159\u00edklad moje pracovi\u0161t\u011b je do s\u00edt\u011b Internet p\u0159ipojeno pevnou linkou 28,8 a j\u00e1 pot\u0159ebuji m\u00edt z domova p\u0159\u00edstup nejen na Internet, ale i do cel\u00e9 lok\u00e1ln\u00ed firemn\u00ed s\u00edt\u011b. Dobrou cestou, pro n\u00e1s slab\u00e9 Linux\u00e1ky, je RAS \u2013 remote…<\/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-9","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\/9","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=9"}],"version-history":[{"count":0,"href":"https:\/\/satelit.cz\/index.php?rest_route=\/wp\/v2\/posts\/9\/revisions"}],"wp:attachment":[{"href":"https:\/\/satelit.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/satelit.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/satelit.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}