WLAN Data Link Layer

Dongosolo la ulalo wa data la WLAN limagwiritsidwa ntchito ngati gawo lofunikira pakutumiza kwa data. Kuti mumvetse WLAN, muyeneranso kuidziwa mwatsatanetsatane. Kudzera m'mafotokozedwe awa:
Mu protocol ya IEEE 802.11, sublayer yake ya MAC ili ndi njira zopezera media za DCF ndi PCF:
Tanthauzo la DCF: Ntchito Yogwirizanitsa Yogawidwa
Ngakhale kuti DCF ndiyo njira yoyamba yopezera IEEE 802.11 MAC, yomwe imagwiritsa ntchito teknoloji ya CSMA / CA ndipo imakhala ya mpikisano, pamene mfundoyi itumiza deta, idzayang'anira njira. Ngati tchanelo sichikugwira ntchito ndimatha kutumiza deta. Njirayo ikangokhala yopanda ntchito, node imadikirira nthawi yodziwika pakati pa DIFS.
Ngati kutumiza kwa node zina sikumveka kumapeto kwa DIFS, nthawi yobwereranso mwachisawawa imawerengedwa, yomwe ili yofanana ndi kukhazikitsa nthawi yobwerera;
Node imazindikira tchanelo nthawi iliyonse ikakumana ndi nthawi: ngati iwona kuti njirayo ilibe ntchito, nthawi yakumbuyo imapitilira nthawi; Apo ayi, nthawi yotsala ya nthawi yobwerera kumbuyo imawumitsidwa, ndipo node imadikiriranso kuti njirayo ikhale yopanda ntchito; pakadutsa nthawi DIFS, mfundoyi ikupitiriza kuwerengera nthawi yotsala; Ngati nthawi ya backoff timer itsika mpaka ziro, chithunzi chonse cha data chidzatumizidwa. Iyi ndi njira yokonzanso yotumizira deta.
PCF: Ntchito Yogwirizanitsa mfundo;
PCF imapereka woyang'anira mfundo kuti asankhe malo onse otumizira kapena kulandira deta. Iyi ndi njira yopanda mpikisano, kotero kugundana kwa chimango sikungachitike, koma kutha kugwiritsidwa ntchito pamanetiweki amderali opanda zingwe okhala ndi zida zina.
Zomwe zili pamwambazi ndi kuyambitsa kwa WLAN Data Link Layer yobweretsedwa ndi Shenzhen Haidiwei Optoelectronics Technology Co., Ltd. Shenzhen HDV Phoelectron Technology Co., Ltd.mankhwala.