FundamentalsTools

802.11 Packet Capture Skillz To Pay The Bills

Digging deep into the Stefanick archives of real world 802.11 issues. I challenge YOU with 4 real world examples. Keep in mind sometimes the obvious is not so obvious. While frames don’t lie understanding 802.11 is important to see the truth. These are real customer issues on real networks with real …

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FundamentalsNews

30 Random Technical Thoughts by a WiFi Engineer

1) CRC is cyclic redundancy check. This means a radio received a frame and failed the checksum. A normal communication the intended receiver will not ACK and the sender will retransmit the frame. What’s important to understand when sniffing just because you have a high CRC rate in your sniffer window …

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Fundamentals

802.11 – Reason Codes and Status Codes

802.11 – Reason Codes and Status Codes  The 802.11 standard section 8.4 comments on reason codes and status codes. I’ve used these myself when troubleshooting frame captures. These codes provide insight to Wi-Fi related problems like stations connecting and disconnecting. Lets dive in and see what the standard says about reason and status code …

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FundamentalsNews

“Wi-Fi Doesn’t Stand For Anything. It Is Not An Acronym. There Is No Meaning.”

Let’s start 2016 with a blog post that will surely get some of you thinking. As a professional who focuses on Wi-Fi communication I’m asked from time to time what does Wi-Fi mean? The conversation usually goes something like this: What does Wi-Fi stand for? Is Wi-Fi an acronym for something? …

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Fundamentals

802.11 – Action Frames

The 802.11 standard section 8.5 comments on action frames. Action frames are interesting. Action frames can be triggered by access points or client stations. The action frame provides information and direction as in what to do. The 802.11 standard comments about action frames in 17 different sections of subsection 8.5. …

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DesignFundamentals

More Power More Problems! When Excessive RF Power Degrades Your WiFi Performance!

In the wireless world we often think more power is good. The louder the signal surely higher the performance gain. I’m sorry to say that’s not  true in most cases. RF power is like a delicate flower and should be treated with respect. Simply choosing a higher power output and …

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FundamentalsNews

Which antenna gets deactivated when you provide less than full power to a Cisco 3700 ?

A question was asked on Cisco Support Community (CSC) enquiring about what antenna is deactivated when a Cisco 3700 access point doesn’t receive a full 16.1 Watts. We have purchased 3702e and some of these access points can only get PoE (802.3af). Which antenna will be activated in this case? …

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DesignFundamentalsSurveyTools

The Price to Play

As someone who has been in the wireless industry for a few years now there’s one thing that really stands out about a Wireless engineer role: the price to play is much higher than other roles. What do I mean by this? Let’s take a look at what is in …

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