Wireless advanced



Linux Server

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Dana siječanj 10th, 2012, Wireless advanced od strane

Linux kao besplatan i jedan od najsnažnijih OS –a trenutno nam može ponuditi puno što se tiče mreža i mrežnih servisa. Na njemu možemo imati dinamični DNS klijent, chat server, file i FTP server. Sve to uz vrlo male zahtjeve na hardware. Što je najbolje ima jako dobru podršku za wireless drivere. Šak i puno..

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Komponente bežičnih mreža

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Dana siječanj 10th, 2012, Wireless advanced od strane

Svaka jača mreža koja izlazi iz granica ureda ili stana sastojat će se u pravilu od ovih komponenti: Pristupne tačke (Access point, skraćeno AP) i Bežičnih mrežna kartica (Wireless NIC, skra ćeno WNIC) kao aktivne te antena kao pasivne opreme. Aktivne komponente AP je uređaj koji služi povezivanju svih klijenata u jednu funkcionalnu mrežu. Može..

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TCP u bežičnim lokalnim mrežama

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Dana siječanj 10th, 2012, Wireless advanced od strane

Budući da je protokol TCP „osmišljen“ za mreže bazirane na žičnim tehnologijama, jasno je uočljiva degradacija njegovih karakteristika u bežičnim mrežama. Za žične mreže vrijedi da su gubici rezultat zagušenja u mreži, dok se u bežičnim mrežama javlja niz novih problema. Evo najčešćih razloga degradacije: Visoka učestalost pogrešaka Prekidi veze Ograničenost i promjenjivost kapaciteta Veličina..

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Fizički sloj (Physical Layer)

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Dana siječanj 10th, 2012, Wireless advanced od strane

Specifikacija IEEE 802.11 fizičkog sloja dopušta korištenje tri opcije: DSSS, FHSS i DFIR, koji se vrlo rijetko koristi. Standard IEEE 802.11b je proširenje standarda IEEE 802.11 koji podržava prijenosne brzine 1 i 2 Mbit/s. IEEE 802.11b podržava i prijenosne brzine od 5.5 i 11 Mbit/s koristeći CCK (Complementary Code Keying) sa QPSK (Quadrature Phase ShiftKeying)..

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MAC podsloj

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Dana siječanj 10th, 2012, Wireless advanced od strane

IEEE 802.11b MAC protokol temelji se na CSMA/CA protokolu koji koristi fizičko mjerenje signala nosioca (physical carrier sense), kao i virtualno mjerenje signala nosioca (virtualcarrier sense) u svrhu izbjegavanja kolizija. Fizičko mjerenje signala nosioca koristi se za izbjegavanje kolizija na strani pošiljatelja, dok se virtualno mjerenje signala nosioca koristi za izbjegavanje kolizija na strani primatelja..

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