Extreme Wireless: WiFi

1
Extreme Wireless WiFi

• Hitesh Patel
• Paul Delumpa
• Hamil Amin

2
Objectives

• Explain how the major wireless technologies are
  used today - WiFi
• Describe the applications used in wireless
  technology
• List and explain the advantages of wireless
  technology

3
Wireless the hype?

• Wireless communications is the next major event
  in the history of technology
• Wireless communications will revolutionize how we
  live
• Users will be able to access digital resources no
  matter where they find themselves

4
Wireless Applications

• Wireless applications are found anywhere
  employees need mobility, including in the
  following industries
• Education
• Military
• Business
• Entertainment
• Travel
• Construction
• Warehouse management
• Health care

5
Wireless Communications in Industries

• Entertainmentbarcodes on tickets validated by
  handheld readers fans accessing game statistics,
  watching replays, ordering concessions through
  notebook computers or PDAs
• Travelglobal positioning systems (GPS) providing
  emergency roadside assistance airline passengers
  using wireless notebooks or PDAs

6
Current Wireless Systems

• Fixed Wireless Access (last mile)
• Wide Area Wireless Data Services (WWANs)
• Cellular Systems
• Satellite Systems Paging Systems
• Bluetooth
• Wireless LANs (WiFi)
• WiFi5 future

7
The Animations Below Simulate Wave Transmission
802.11-
Waves 802.11WiFi
Continuous waves are transmitted with information
embedded in the modulation of the wave's
amplitude or frequency. This technology is
approaching its limit in being able to improve
bandwidth (Amount of information sent) and
channelization (Number of users).
8
Wireless Local Area Network (WLAN)

• Based on the Institute of Electrical and
  Electronic Engineers (IEEE) 802.11b networking
  standard
• WLAN computers transmit up to 11 Mbps at
  distances of 375 feet
• IEEE 802.11a standard increases bandwidth to 54
  Mbps
• 802.11 often called Wireless Ethernet

9
IEEE 802.11

• Introduced in 1990
• Defines cable-free local area network with either
  fixed or mobile locations that transmit at either
  1 or 2 Mbps
• Uses OSI model with functions of PHY and MAC
  layer performing WLAN features
• Slow bandwidth insufficient for most network
  applications

10
IEEE 802.11a

• Approved in 1999, 802.11a transmits at speeds of
  5.5 Mbps and 11 Mbps
• Great demand for 802.11a WLANS, also called
  Wi-Fi5, with maximum speed of 54 Mbps on 12
  channels
• In the 5 GHz band
• Added two higher speeds 5.5 and 11 Mbps

11
IEEE 802.11b

• Today is widely adopted as Wi-Fi
• Quickly became standard for WLANS
• 1999 Amendment to 802.11 standard becomes today
• Added two higher speeds 11 and 22 Mbps

12
Market Position

• Current position is between IEEE 802.11x WLANs
  and cell phones
• WLAN is preferred technology for connecting
  wireless devices to form network
• WLAN is mature, robust, flexible, popular
  technology
• Trend today is fewer devices instead of more, and
  cell phones have integrated capabilities that
  Bluetooth lacks

13
Wireless Advantages and Disadvantages

• Advantages
• Mobility
• Easier and less expensive installation
• Increased reliability
• Disaster recovery

• Disadvantages
• Health risks ?
• Radio signal Interference
• Security

14
Wireless Advantages

• Mobilityemployees have contact with network
  work in teams for better productivity
• Easier and less expensive installationno need to
  install cables or modify historical property
  easy to remodel office without concern for
  network access
• Increased reliabilityno outages caused by cable
  failure
• Disaster recoveryeasy to relocate office quickly
  using WLANs and laptop computers

15
Wireless Disadvantages

• Health risks?devices emit small levels of RF
• FDAinconclusive about safety of wireless devices
  
• Securitysome wireless technologies add security
  such as encryption or coded numbers for
  authorization to gain access to the network