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The Australian Communications & Media Authority, or ACMA, published a wall chart for radio frequency spectrum allocations in 2013. For RF geeks this is a beautiful representation of what services sit where in different frequencies of radio spectrum. It's interesting to look at to see how tiny the portion of spectrum 802.11 (Wi-Fi) uses. Below is a screenshot of just a small corner of the chart and as you can see it is hard to pinpoint the 5GHz WiFi frequencies hiding in amongst this subset of data.  ACMA Radio frequency spectrum allocations Check the whole chart out, and download it as a PDF here.
Or if you have the time and like reading documents like this here is the totally verbose text version of the same information.
Comments
 A couple of years ago I played around with some Mac OS X clients and a packet analyser in an attempt to gain a better understanding of what was going on between the clients when using AirDrop. I was intrigued to see if there was any interaction with local wireless infrastructure. We had been receiving assistance requests from School IT Teams regarding wireless performance where they attributed the issue to student use of AirDrop. So I took a peek at packets and frames to see if I could uncover anything that might be useful from a vendor level to better co- or inter-operate with AirDrop.
I was surprised by how efficient the data transfer was. Inter device file sharing seemed so smooth and transfers were fast. Should I have been so surprised? Of course cutting out an AP (or a hop in a single duplex network) will improve performance. Apple’s laser focus on end user experience bypassed the thought that vendors might struggle with the concept of co-inhabiting an airspace where clients have direct wireless interaction. The implementation of AirDrop was relatively user friendly and has only improved with the integration with iOS devices. It’s this user centric vision that lead me to my next thought... |
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