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

Cisco Wireless Compatibility Matrix (Nov. 2011)

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

Social Links
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




  • 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!

IEEE 802.11a/g/n Reference Sheet


LWAPP QoS Packet Tagging



Interference Types


Microwave Oven

Cordless Phone



What you NEED to know about TX Power and 802.11a (5GHz) on a Cisco LWAPP AP

Power, power power.... One of the MOST important design factors is selecting the proper radio TX power when designing any wireless network. You must consider your lowest common denominator and adjust your power equally between your client and AP for optimal design.

But did you know when you select different UNII channels in the 5 GHz band you are also changing the TX power of your AP on a Cisco WLC? When selecting power on a cisco ap in the WLC you are presented with the power levels 1,2,3,4,5 etc. Most folks are aware on the 2.4 GHz side power levels.

1 = 20 dBm / 100mW
2 = 17 dBm / 50mW
3 = 14 dBm / 25 mW
4 = 11 dBm / 12.5 mW

But did you know depending on the UNII band you select the power levels are different on the 802.11a 5GHz radio.

UNII 1                                                 UNII 2 / 3

1 = 11 dBm / 12.5 mW                          1 = 17 dBm / 50mW
2 = 8 dBm / 6.25 mW                            2 = 14 dBm / 25 mW
3 = 5 dBm / 3 mW                                3 = 11 dBm / 12.5 mW
4 = 2 dBm / 1.5 mW                              4 = 8 dBm / 6.25 dBm


(Cisco Controller) >debug ap enable <Name of AP>
(Cisco Controller) >debug ap command "show controller do 1" <Name of AP>


"show controller do 0" is interface Dot11Radio0
"show comtroller do 1" interface Dot11Radio1

UNII-1 POWER LEVEL - Controller Power Level 1

(Cisco Controller) >
Thu Oct 29 10:37:02 2009: afa0:
Thu Oct 29 10:37:02 2009: afa0: !

Thu Oct 29 10:37:02 2009: afa0: interface Dot11Radio0

Click to read more ...


Cisco DHCP Option 43 Configuration Nugget!

This nugget covers DHCP 43 configuration for a Cisco LWAPP deployment using a Windows Server 2003. You dont want to miss this nugget!

I will take you through all the steps, start to finish how to configure option 43 on a Windows Server 2003. We will exam packet captures from the access point and controller. You will see live how option 43 with a Cisco LWAPP deployment works! Enjoy and thanks for watching!

Click to read more ...


Cisco AP Group Nugget!

Learn how to leverage Cisco's AP Group functionality in your enterprise to enhance your network by shaping the broadcast domains of your wireless clients while keeping intact a common SSID!! I will show you the steps, start to finish, how to configure Cisco AP Group!