Do non-overlapping channels overlap?

We all know the "non-overlapping" channels 1/6/11 in 2.4GHz (5GHz matter is similar). Do they really not overlap? I keep bumping into this in conversations, and would like to create a point of reference (with pictures) instead of having to repeat same old over and over. Since we a dealing with broadband technology, the signal... Continue Reading →

WLAN Channel Management F1 Style: Part 2 of 3

Part 2 of the mini-series. Today we will review the results and some details of the experiment. The University has an enterprise-grade WLAN from a Tier1 vendor. The overall amount of APs under test is 100 (plus up to 90 neighbouring APs not belonging to that network). They represent a portion of the bigger campus... Continue Reading →

Wi-Fi Riddles: Invisible 40MHz

A while ago I stayed in a small hotel that, had virtually all the problems of 'small hotel wi-fi' (including unresponsive one-device-per-room hotspot and lack of support outside of business hours. How many people stay at the hotel inside the business hours?). This is very typical of a WLAN installation made by a small local... Continue Reading →

Wi-Fi Riddles: Strong signal = bad signal?

While I was working on the next part of the "Unobvious and overlooked Wi-Fi" (which is about channels), I got an interesting knowledge nugget from our engineering. We all know that there is a lower limit to receiver sensitivity, we all know that there must be some upper limit, after which the Rx signal is... Continue Reading →

Running a WLAN controller in VMWare Player

Motorola WiNG5.6 firmware images were finally posted last week, and along them, the VX9000 cloud controller DEMO image. I am very excited about it, as it allows me to run a VM version of Motorola's top controller (or cluster, or hierarchy for that sake) right on my laptop! No need to say about potential for... Continue Reading →

[Opinion] 2×2:2 MIMO in Smartphones

So, Broadcom announced a 2x2:2 (867Mbps) chip for mobile devices, which of course generated lots of excitement. Let's see: 867Mbps Wi-Fi, you say? Can you sustain such speed with your home Internet connection? Have you seen hotspots offering such a high-speed Internet? Do you have a RAID-enabled NAS at home for file transfers, since even... Continue Reading →

Wi-Fi Riddles: Faster speeds require weaker signals?

A discussion of my previous post in the 802.11 Wireless professionals group lead to a discovery of a new bit of overlooked knowledge! Many thanks to Eduard Garcia-Villegas and Mike Rex, who turned my attention to this one. Ever wondered why faster rates have smaller effective distance? It was always attributed to signal fading - higher rates... Continue Reading →

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