We don't like our APs jumping channels, and we have too tight of a
channel plan to have "extra" channels available. We lock our APs to the
DFS frequency.
If a detection happens (true or false) the AP shuts down for 30 minutes
and then will sense and fire back up if the source is gone. Almost
never a false positive hit on Ubiquiti gear when run properly.
On 11/21/19 11:41 AM, Steve Jones wrote:
180 second wait on a detect, i believe. so it waits the 180 before
transmitting initially, then if there is a detection it waits to hop.
the 4.4.2 firmware is really sticky on your alternate channels, it wont
let you save them if you dont have the required separation (no to 2.5 or
5mhz) DFS is really only a 2 mile pmp solution on a good day with your
leg cocked back. but you can do massive speeds in that 2 miles. youre
"supposed" to spread your DFS use across the whole band across your
network but i doubt anybody does. consumer stuff i wonder if it has the
same requirements for detection since its "indoor" only.
On Thu, Nov 21, 2019 at 10:32 AM Ken Hohhof <[email protected]
<mailto:[email protected]>> wrote:
We mostly avoid DFS frequencies on APs because of the impact if we
get false radar detects. Also we are mostly a Cambium shop. So I’m
a bit confused about DFS on other vendor equipment like Ubiquiti as
well as home routers.____
__ __
Question 1 – what happens when there’s a DFS detection? On the
Cambium gear, we have to select 1 or 2 alternate frequencies. But
on other gear, I don’t see this. When there’s a DFS hit, does it
jump to another random frequency? Does it rescan the current
frequency until it tests clear and only then resume transmission?
Is the answer right in front of me and I’m being stupid? Maybe in
the case of routers they are exempt because of low EIRP?____
__ __
Question 2 – what about 40/80/160 MHz channels? We have a
competitor using Ubiquiti gear and advertising residential
subscriber speed plans up to 100x100. Clearly they must be using at
least 40 MHz channels if not 80 MHz, or else their marketing people
have burning pants and long noses. And I don’t see how a WISP,
especially one surrounded by other WISPs, could use wide channels
other than in DFS bands. We have some PTP links using 40 MHz but
only 10 and 20 MHz channels on our APs. So assuming you are using
40 or 80 MHz in DFS, what happens when there’s a DFS detect? Does
the whole 40 or 80 MHz have to find a new home? Can it slide over
2.5 or 5 MHz and substantially overlap the previous occupied
spectrum? DFS bands come with enough spectrum to use wide channels,
but is there enough to jump around when you take a DFS hit?____
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