Hey wopper, gaan we deze discussie alweer voeren....
In deel I heb ik nog het volgende gepost:
Je zou ook in een van de DFS channels het volgende kunnen hebben:
Soms ziet het Wi-Fi netwerk zijn eigen reflecties aan voor een radarsignatuur of hij ziet wel degelijk radars...
Ook de specs tussen de UNII-1 en UNII-2 band verschillen ook:
https://i.stack.imgur.com/HznGn.png
Of een reactie van netgear engineers:
https://community.netgear...-band-slower/td-p/1077263
Re: R8000 one 5ghz band slower
I had been following up with support and after a while got his response :
"We just received an update from our engineers. The issue is down to customer environment we cannot offer a solution.
This issue could be due to R8000 detected background radar signal, therefore switch 5G-2 channel to another channel to avoid interference. When switch to another channel, the channel bandwidth might be changed as well. For example, when channel is switched to 140, the bandwidth might be HT20, and resulting in 289Mbps. "
No clean fix for EU.
En DFS technieken in routers:
DFS-master technology isn’t trivial to implement. Radar pulses are hard to detect because they are very, very fast (each pulse lasts just about one half of 1 microsecond) and can be present at very low power levels (as low as –62 to –64 decibel-milliwatts). Incorporating radar-detection tools eats up bandwidth—as much as 17 percent—because a router must listen on a channel for a minimum of 60 seconds before concluding that it is clear for transmitting, and then continue to listen during and in between normal transmissions.
Currently, DFS-master technology is available in expensive routers, the kind that are typically installed only by large businesses. It is migrating to some lower-cost consumer-level routers in Europe and Japan. But both the expensive business versions and the cheaper consumer versions are not all that clever: When they detect radar, they quickly shift traffic back to a set default channel in the non-DFS part of the 5-GHz band—a crowded spot. And they don’t go back to using radar-priority channels until their users reboot their routers. In a business environment, that is often scheduled to happen daily, but in a residential setting, it might take weeks or months before the user realizes that the router is not performing well and needs to be reset. So even routers with DFS capabilities are staying out of those express lanes, at least most of the time.
http://spectrum.ieee.org/...i-stinksand-how-to-fix-it
Dus het ligt vooral aan de implementatie van het scannen van de DFS kanalen in de AP's of routers. Gezien de prijzen van Ubiquiti zal dat niet de meest geavanceerde technologie zijn...
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Voor 3% gewijzigd door
Shaggie_NB op 05-07-2017 22:52
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