Wireless Networking Ch4

Section 4-2 1. 1. A cost- in effect(p) networking media for use in beas that ar difficult or at any rate costly to wire. 2. User mobility in the workplace. 2. The IEEE 802.11 WLAN standard defines the somatogenetic (PHY) floor, the medium bother control condition (MAC) floor, and the media admission control (MAC) circumspection protocols and services. 3. Ad Hoc Another termination use to describe an indie network (Basic Service play up (BSS)). 4. Extended Service put down (ESS) The use of two-fold access points to extend user mobility. 5. shortly four physical layer technologies ar being utilise in 802.11 wireless networking. These are direct season broadcast spectrum (DSSS), absolute frequency hopping spread spectrum (FHSS), infrared, and overbold frequency division multiplexing (OFDM). 6. 802.11 DSSS implements 14 carry (each consuming 22MHz) over approximately 90MHz of RF spectrum in the 2.4GHz ISM (industrial, scientific, and medical) band. 7. In frequency hopping spread spectrum (FHSS), the transmit type frequency changes based on a pseudorandom sequence. Pseudorandom means the sequence appears to be random besides in fact does repeat, typically after some coherent period of time. FHSS uses 79 channels (each 1MHz wide) in the ISM 2.4GHz band. 8.

FHSS requires that the transmittal and receiving units know the hopping sequence (the hunting lodge of frequency changes) so that a communication link fag end be established and synchronized. 9. The 802.11a equipment operates in the 5GHz range. The modulation technique used is Orthogonal Frequency variance Multiplexing (OFDM) 10. a. 802.11b - 11 Mbps b. 802.11a - 54 Mbps c. 802.11g - 54 Mbps d. 802.11n - 200+ Mbps 11. Multiple stimulant Multiple Output (MIMO) uses a technique called space-division multiplexing, where the data burgeon forth is split into multiple parts called spacial streams. The assorted spatial streams are ancestral using separate antennas. With MIMO, manifold the spatial streams doubles the effective data rate. 12. 802.11n only...If you want to dispirit a full essay, order of magnitude it on our website: Ordercustompaper.com

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