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Wireless Quiz 2

Scott Coleman IT 2 Inglés 29 fichas

Fichas del conjunto (29)

  1. 1lesson 4 and 5.
  2. 2What 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
  3. 3What is Canada's Regulatory Body?CRTC, Canadian Wireless Telecommunications Association (CWTA) and The Canadian Wireless Telecommunications Association (CWTA
  4. 4How many Channels according to the FCC in 2.4ghz band?allows channels 1 to 11 in 2.4GHz band, indoor and outdoor
  5. 5In 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
  6. 6all sub bands are approved for indoor but which is restricted from out door use?UNII-1
  7. 7How 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
  8. 8Which Channels are non overlapping?Channels 1, 6, and 11 are nonoverlapping
    Note: some European countries use channels 1, 5, 9, and 13 for data
  9. 9What standards govern the 2.4 GHZ bandUsed by the 802.11, 802.11b, 802.11g, and 802.11n
  10. 10How many channels in 5GhzÉ23 nonoverlapping channels
  11. 11How many channels in the 5 Ghz spectrum?23 nonoverlapping channels
  12. 12What Standards govern the 5Ghz band?the 802.11a, 802.11n and 802.11ac standards
  13. 13Which band has less interference5ghz
    2.4 has more because of higher use
  14. 14What is Modulation?Modulation is the way in which the symbols are represented through the radio wave itself
  15. 15Differential 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
  16. 16Differential 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
  17. 17Complementary Code Keying (CCK) uses 6 bit symbols to achieve what speed? under what IEEE standard?11 Mbps, 802.11.b Standard.
  18. 18to avoid over lap we use orthogonal (at 90 degree angle of one another) or ?Orthogonal Frequency Division Multiplexing (OFDM)
  19. 19OFDM is used in what IEEE standards?Used in 802.11a, 802.11n, and 802.11ac
  20. 20BPSK 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
  21. 21To 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
  22. 22That 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
  23. 23What 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
  24. 24802.11b Characteristics?ratified in September 1999
    2.4-GHz band
    Direct Sequence Spread Spectrum
    1, 2, 5.5, 11 Mbps
    36 dBm
  25. 25802.11g 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
  26. 26802.11a 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
  27. 27802.11n Characteristics?Ratified as standard on September 11, 2009
    Operates at both 2.4 and 5 GHz
    MIMO
    Data rate up to 600Mbs
  28. 28What is MIMO?Multiple-Input Multiple-Output
    Uses multiple radios and antennas
  29. 29What technologies support MIMOSpatial Multiplexing (SM)
    Multi Ratio Combining (MRC)
    Transmit Beamforming (TxBF)

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2 IT Fichas sobre Wireless Quiz 2, creado por Scott Coleman el 23/02/2016.
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Scott Coleman
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