Wired Stuff
WiFi Tablet Corner
My80211 White Papers (Coming Soon!)

Cisco Wireless Compatibility Matrix (Nov. 2011)

WiFi Training


 

Podcasts / Videos

My80211 Videos

Cisco: 802 11 frames with Cisco VIP George Stefanick

Fluke Networks: Minimize Wi Fi Network Downtime

Aruba: Packets never lie: An in-depth overview of 802.11 frames

ATM15 Ten Talk “Wifi drivers and devices”

Houston Methodist Innovates with Wireless Technology

Bruce Frederick Antennas (1/2)

 

Bruce Frederick dB,dBi,dBd (2/2)

Cisco AP Group Nugget

Revolution WiFi Capacity Planner

Anchor / Office Extends Ports

 

Peek Inside Cisco's Gear

See inside Cisco's latest wireless gear!

2.4 GHz Channel Overlap

EXAMPLE 1  

EXAMPLE 2

EXAMPLE 3  

Interference Types

BLUETOOTH
 

Microwave Oven
 

Cordless Phone

JAMMER!
 

LWAPP QoS Packet Tagging

 

 

IEEE 802.11a/g/n Reference Sheet

 

CWSP RELEASE DATE 2/08/2010
  • CWSP Certified Wireless Security Professional Official Study Guide: Exam PW0-204
    CWSP Certified Wireless Security Professional Official Study Guide: Exam PW0-204
    by David D. Coleman, David A. Westcott, Bryan E. Harkins, Shawn M. Jackman

    Shawn Jackman (Jack) CWNE#54 is a personal friend and has been a mentor to me for many years.  I've had the pleasure and opportunity to work with Jack for 4 years. Jack is a great teacher who takes complex 802.11 standards and breaks them down so almost anyone can understand the concept at hand. I'm excited for you brother. Great job and job well done! Put another notch in the belt!

Saturday
Sep042010

Liquid Antenna - (Sea Water Antenna)

  

Liquid Antennas aren’t necessarily a  new concept. There have been a few “projects” in the works. Attached is a youtube video of another concept of a “Liquid Antenna with Sea Water”

The concept is revolutionary in a grand sense. Think of the unique and endless possibilities. There are the obvious questions like gain, pattern etc which wasn’t covered.  Enjoy!

Tuesday
Mar302010

ISM Band Frequency  Refresher

 

 

I worked with a customer recently who was convinced the ISM band was only for 2.4 GHz band. Which is 100% incorrect! Here is a refresher … 

The ISM  (In the ISM Band) stands for "industrial, scientific and medical" radio bands. The ISM includes the following frequencies:

902 - 928 MHz                    (26 MHz in width)

2.400 - 2.4835 GHz           (83.5 MHz in Width)

5.725 - 5.875 GHz              (150 MHz in Width) ** Note 5.8 GHz ONLY**

This ISM bands were defined by the ITU Telecommunication Standardization Sector

http://www.itu.int/ITU-R/terrestrial/faq/index.html#g013

The ISM bands are governed by the FCC here in the United States and they are unlicensed.  This is found under title 47, part 18.

http://www.access.gpo.gov/nara/cfr/waisidx_07/47cfr18_07.html

Although the band is labeled as “industrial, scientific and medical” bands -- you will find almost everything and anything under the sun that is unlicensed in these frequencies. You name it, it rides these waves.  WiFi, cordless phones, Mircowave ovens, Bluetooth, toys, baby monitors, wireless cameras, etc !