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




LWAPP QoS Packet Tagging



IEEE 802.11a/g/n Reference Sheet


Interference Types


Microwave Oven

Cordless Phone


  • 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!

« Cisco Releases iPhone APP v1.0 for CSC (Cisco Support Community) | Main | IPAD OTTERBOX REVIEW »

PoE Power Switches (Midspans) – Inexpensive Power Management Alternative 

As a consultant, customer budgets are almost always KING. Sometimes PoE switches aren’t in the budget for the WLAN deployment. So what options do you have? 

Managed power switches, also called “midspans” have been around for a longtime. In fact they are thecost alternative to PoE switches. A Cisco PoE switch will set you back some heavy green, especially if it’s enhanced power, 802.3at. Also, customers don’t like the mess of power injectors and the lack of management. You can’t easily power cycle an access point that is hooked to an injector, which means a certain visit to the IDF closet.  

Over the years, I’ve worked with and deployed projects with PoE Power Switches / midspans. These are simple data pass through devices, similar to PoE injectors. The difference is these come in small 6 to 48 ports, 1u switches. Also, certain models are managed, which means you log into the Power Switch and simply power cycle the port.

There are a number of vendors and options when selecting a power switch. Personally, I've used and deployed Microsemi PowerDsine in a number of accounts. I also use a 9000G in my home lab.

PowerDsine has a real nice product line with a number of models and options.  They start off with the simple 1 port PoE injector to a PoE extender that pushes power and data to 200 meters! PowerDsine models provide 802.3at and 802.3af power. They also provide a Cisco “Splitter” for devices that are only Cisco PoE compatible.

These also come in handy when you need to stage a large deployment and prime your access points.

Reader Comments

There are no comments for this journal entry. To create a new comment, use the form below.

PostPost a New Comment

Enter your information below to add a new comment.

My response is on my own website »
Author Email (optional):
Author URL (optional):
Some HTML allowed: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <code> <em> <i> <strike> <strong>