Utilization

• Wireless user and bandwidth utilization

Rogues and Interferers

• Rogues are access points that don’t belong to the WOU network and may be masquerading as a WOU access point
• Interferers are devices that are transmitting on the same frequency as the WOU wireless access points.  Most interference occurs in the 2.4Ghz frequency spectrum.  This could include cordless phones, microwave ovens, Bluetooth, rogue access points and xBoxes.
• Users, rogues and interferers
• Interferers
  • Interferer overview
  • Bluetooth link risk in a wireless environment — 2.4Ghz frequency hopping
  • Bluetooth discovery risk in a wireless environment — 2.4Ghz
  • WiMax risk  — 5.0Ghz, frequency hopping
  • xBox risk — 2.4Ghz frequency hopping
  • Microwave oven risk in a wireless environment — 2.4Ghz
  • Microwave location
• Rogues
  • Rogue “most likely” location
  • Rogue access point details
  • Rogue history

802.11 a/b/g/n/ac

• Example wireless statistics for MacBook Air
• 802.11 a/b/g/n are available in all WOU wireless locations
• 802.11 ac deployment was begun in new locations in December 2014.
• To take advantage of the higher speeds available with 802.11 n/ac, multiple antennas are required.  This is referred to as MIMO (multiple input, multiple output)

• Frequency
  • 802.11 b/g/n — 2.4Ghz
  • 802.11 a/n/ac — 5.0Ghz
• Channels
  • 802.11 b/g/n
    • Available channels include 1 – 11
    • The effective channels include — 1, 6, 11.  Utilizing other channels in the 2.4Ghz range will cause interference to the channels on either side.
  • 802.11 a/n/ac — The effective channels include — 36, 40, 44, 48, 52, 56, 60, 64,100, 104, 108, 112, 116, 132, 136, 140, 149, 153, 157, 161, 165
• Speed — theoretical
  • Wireless is a shared resource.  Each user shares the bandwidth with every other user using an access point.  If there is a slow user connected to an access point, that slows down access for every other user.
• 802.11 n — 300Mb/s — 100Mb/s per antenna  (MIMO)
• 802.11 ac — 1.3Gb/s — 400Mb/s per antenna (MIMO) on 5Ghz
• 802.11 ac — 450Mb/s — on 2.4Ghz
• 802.11 a — 54Mb/s
• 802.11 b — 11Mb/s
• 802.11 g — 54Mb/s

• Year developed
  • 802.11 b — 1999
  • 802.11 a — 1999
  • 802.11 g — 2002
  • 802.11 n — 2009
  • 802.11 ac — approved January 2014