Wireless Networking Ch4

Section 4-2 1. 1. A cost-effective networking media for use in beas that ar difficult or too costly to wire. 2. User mobility in the workplace. 2. The IEEE 802.11 WLAN standard defines the physical (PHY) floor, the medium bother tick off (MAC) seam, and the media entrance fee control (MAC) management protocols and services. 3. Ad Hoc Another terminus used to describe an independent network (Basic Service hightail it (BSS)). 4. Extended Service Set (ESS) The use of multiple access points to extend user mobility. 5. Currently four physical layer technologies argon being used in 802.11 wireless networking. These are direct sequence spread spectrum (DSSS), frequence hopping spread spectrum (FHSS), infrared, and extraneous frequency division multiplexing (OFDM). 6. 802.11 DSSS implements 14 channels (each consuming 22MHz) all 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 signal frequency changes based on a pseudorandom sequence. Pseudorandom means the sequence appears to be random to a fault in fact does repeat, typically after some considerable period of time. FHSS uses 79 channels (each 1MHz wide) in the ISM 2.4GHz band. 8.

FHSS requires that the transmission and receiving units know the hopping sequence (the order of frequency changes) so that a communication link can be established and synchronized. 9. The 802.11a equipment operates in the 5GHz range. The modulation technique used is Orthogonal Frequency naval division M ultiplexing (OFDM) 10. a. 802.11b - 11 Mb! ps b. 802.11a - 54 Mbps c. 802.11g - 54 Mbps d. 802.11n - 200+ Mbps 11. Multiple input Multiple Output (MIMO) uses a technique called space-division multiplexing, where the data burgeon forth is split into multiple parts called spacial streams. The opposite spatial streams are transmitted using separate antennas. With MIMO, doubling the spatial streams doubles the effective data rate. 12. 802.11n only...If you want to queer a full essay, order it on our website: OrderCustomPaper.com

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