Wireless Standards

Question 1

IEEE standard for wireless networks

Answer 1

802.11

Question 2

FHSS

Answer 2

Frequecy Hopping spread spectrum

Question 3

Frequency Hopping Spread Spectrum (FHSS)

Answer 3

The signal hops between random frequencies to reach the destination

Question 4

DSSS

Answer 4

Direct Sequence Spread Spectrum

Question 5

Direct Sequence Spread Spectrum (DSSS)

Answer 5

Data is divied into smaller pieces before being sent with a higher bitrate

Question 6

MIMO

Answer 6

Multiple Input Multiple Output

Question 7

Multiple-Input Multiple-Output (MIMO)

Answer 7

uses multiple signals on different frequencies to increase the range and bandwidth of wireless networks and forms directed beams toward each client, reducing the interference from other wireless devices

Question 8

802.11

Answer 8

• 1997
• Provides 1 or 2 Mbps transmission in the 2.4 GHz band
• Uses frequency-hopping spectrum (FHSS)
• Can also use direct-squence spread spectrum (DSSS)

Question 9

802.11a

Answer 9

• 1999
• 54Mbps in the 5 Ghz band

Question 10

802.11b

Answer 10

• 2000
• 11 Mbps in the 2.4 GHz band
• uses only direct-sequence spread spectrum (DSSS)

Question 11

802.11g

Answer 11

• 2003
• used for transmissions over short distances
• 54Mbps in the 2.4GHz bands

Question 12

802.11n

Answer 12

• 2007
• adds multiple input multiple output (MIMO)
• 4-5 times faster than 802.11g

Question 13

802.11ac

Answer 13

• 2013
• Delivers data rates of 433 Bbps per signal or 1.3 Gbps in a three signal design

Question 14

802.11ah

Answer 14

• 2017
• first Wi-Fi spec to operate in frequency below 1GHz
• 900 MHz
• Can penetrate walls and other barriers better than previous WiFi standards
• Much lower bandwidth <9Mbps
• Designed for IoT devices and similar use cases with limited bandwidth needs over longer distances

Question 15

802.11ax

Answer 15

• 2019
• Updated to 802.11ac
• Rebranded Wi-Fi 6
• Adds support for 6Ghz frequency range
• Support for approximately 1-10Gbps