Wireless Quiz 2

Frage	Antworten
lesson 4 and 5	.
What are regulatory bodies?	Each country has its own set of regulations that determines what type of signal (what shape and power level) can be sent in each part of the global RF spectrum
What is Canada's Regulatory Body?	CRTC, Canadian Wireless Telecommunications Association (CWTA) and The Canadian Wireless Telecommunications Association (CWTA
How many Channels according to the FCC in 2.4ghz band?	allows channels 1 to 11 in 2.4GHz band, indoor and outdoor
In 5 GHZ its dependent on the sub band. How many sub bands are under 5 Ghz?	4 sub bands UNII-1, UNII-2, UNII-2 extended, UNII-3
all sub bands are approved for indoor but which is restricted from out door use?	UNII-1
How wide are WLAN channels?	20 to 22 MHz–wide Note: If you want to use several channels in the same physical space, they must be nonoverlapping
Which Channels are non overlapping?	Channels 1, 6, and 11 are nonoverlapping Note: some European countries use channels 1, 5, 9, and 13 for data
What standards govern the 2.4 GHZ band	Used by the 802.11, 802.11b, 802.11g, and 802.11n
How many channels in 5GhzÉ	23 nonoverlapping channels
How many channels in the 5 Ghz spectrum?	23 nonoverlapping channels
What Standards govern the 5Ghz band?	the 802.11a, 802.11n and 802.11ac standards
Which band has less interference	5ghz 2.4 has more because of higher use
What is Modulation?	Modulation is the way in which the symbols are represented through the radio wave itself
Differential Binary Phase Shift Keying (DBPSK) does what to the wave when it hits a 1?	When the next value to send is a 1, change direction (if the wave was going up, suddenly go down, and vice versa) The result is a 1 Mbps communication
Differential Quadrature Phase Shift Keying (DQPSK) does what differently?	Sends symbols of grouped 1's and 0's instead of 1 OR 0 (00, 01, 10, 11) and changes in 90 degree increments allowing for 2 Mbps data transmission
Complementary Code Keying (CCK) uses 6 bit symbols to achieve what speed? under what IEEE standard?	11 Mbps, 802.11.b Standard.
to avoid over lap we use orthogonal (at 90 degree angle of one another) or ?	Orthogonal Frequency Division Multiplexing (OFDM)
OFDM is used in what IEEE standards?	Used in 802.11a, 802.11n, and 802.11ac
BPSK and QSK adjusted where the wave started from what does QAM also adjust for faster transmission?	QAM changes the amplitude Four amplitudes times four directions create 16 possibilities
To improve reliability and resistance QAM repeats the packets. (match not question)	1/2 the symbols are repeated, and allows for 24 Mbps 36 Mbps by only repeating 1/4
That was 16-QAM next is 64-QAM (not a question)	64-QAM allows 1 Mbps per carrier, or 48 Mbps 2/3 of the bits are new information bits and 1/3 of the bits are redundant 1/4 redundant bits, the speed can increase to 54 Mbps (1.125 Mbps per carrier
What is dynamic rate shifting (DRS).	802.11 networks, operating in the 2.4-GHz range, the devices can rate-shift from 11 Mbps to 5.5 Mbps, and further to 2 and 1 Mbps depending on the circumstances. IE; distance, interference, signal quality
802.11b Characteristics?	ratified in September 1999 2.4-GHz band Direct Sequence Spread Spectrum 1, 2, 5.5, 11 Mbps 36 dBm
802.11g Characteristics?	published in 2003 2.4-GHz ISM with OFDM 12 data rates of up to 54 Mbps. 1, 2, 5.5, 11 Mbps (DSSS / 802.11b) 6, 9, 12, 18, 24, 36, 48, 54 Mbps (OFDM) 20 dBm for DSSS, but only 15 dBm for OFDM
802.11a Characteristics?	ratified September 1999. the 5-GHz spectrum Uses Orthogonal Frequency-Division Multiplexing (OFDM) Uses eight data rates of up to 54 Mbps 6, 9, 12, 18, 24, 36, 48, 54 Mbps
802.11n Characteristics?	Ratified as standard on September 11, 2009 Operates at both 2.4 and 5 GHz MIMO Data rate up to 600Mbs
What is MIMO?	Multiple-Input Multiple-Output Uses multiple radios and antennas
What technologies support MIMO	Spatial Multiplexing (SM) Multi Ratio Combining (MRC) Transmit Beamforming (TxBF)

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