"muliplexing" - 1 õppematerjal

Arvutivõrgud ja andmeside

 Bluetooth (IEEE 802.15) - levi kuni 10m, ribalaius 1Mb/s. Sagedusala 2,40- 2,48GHz. Ver 2.0 kuni 3Mb/s.   IrDA(Infrared Data Association) - levi ca 1 meeter, ribalaius kuni 16Mb/s. Vajab otsenähtavust. Infapunakiirgus 802.11   PMD - physical medium dependent  PLCP - physical layer convergence procedure  FHSS - frequently hopping spread spectrum  DSSS - direct sequence spread spectrum  OFDM - orthogonal frequency-division muliplexing  HR-DSSS - high-rate DSSS  MIMO - multiple-input and multiple-output IEEE 802.11  Juhuvõrgu laad (ad-hoc) o BSS (Basic Service Set)  Infrastruktuuri laad (infrastructure) o BSS o ESS (Extended Service Set)   DS (Distribution System)  Jagatud meedium  Aja jaotamiseks kahe laadi operatsioone o DCF (distributed coordination function) - kohustuslik