That’s very impressive progress, kudos and thanks for the info.
From: Sean Heskett
Sent: Sunday, January 24, 2016 2:58 PM
To: [email protected] ; [email protected]
Subject: Re: [AFMUG] Canopy 14.1.1 DFS problems :-/
alright so after digging into this and making some adjustments I think i've got
the DFS events settled down now.
1. Issue: The 14.1.1 upgrade on PMP450 APs using the 5.4 band will delete
"Alternate Frequency Carrier 1" and "Alternate Frequency Carrier 2".
Fix: I had to log into each AP and manually add the 2 alternate channels
back into the APs. This way when we have a DFS event the AP will move to
another channel. Since the upgrade had deleted the 2 alternates the AP would
shutdown for 30min.
2. Issue: The tower that was having the most DFS issues has 11 PMP450 APs and
It's a commercial tower with a lot of FM stations etc. All APs are connected
to a CTM2 however after the upgrade half the APs were getting sync from the
CTM2 over the power port and half didn't see any sync on the power port.
Fix: after reading other reports of the 450s having weird sync issues
(causing other issues besides DFS events) I decided to force all 11 APs to use
the onboard GPS and I turned off the power port timing and timing port timing
to achieve this. So now all APs at this tower are receiving sync from the
onboard GPS.
3. Issue: Somewhere along the line (13.x) cambium made it so that a 450AP in
the 5.4 band couldn't be set to more than 75% downlink. We originally had them
set for 85% downlink and they were timed with our 430 APs. Well when cambium
forced the change without any notification suddenly our 450 APs were out of
time with our 430 APs. The area that this problem tower is located we had
removed all the 430 APs and moved them to smaller towers at the edge of our
network so I didn't think we'd have any timing issues since there were
mountains blocking the signals. However there was one tower with 430s still on
it that was ~7 miles from this problem tower.
Fix: I changed the 430 timing to match the 450 timing at the problem tower.
after running this weekend with the new settings I've only had 1 DFS event
where as before these fixes the were a couple APs having DFS events 2-5 times a
day.
In conclusion it seems like 14.1.1 is WAY more sensitive in regards to timing
sources. Also 14.1.1 doesn't seem to reliably receive sync over power. Again
when were were on 13.2.1 we didn't have any of these issues. 14.1.1 introduced
some timing and DFS issues but they are somewhat manageable (i really hate
turning off a sync source because it'd be nice to have it as a backup). It
seems like if a nearby AP is out of sync that will trigger a DFS event.
2 cents. I'll report again in a few days to see if these fixes have eliminated
the DFS events.
-Sean
On Wed, Jan 20, 2016 at 5:41 PM, Sean Heskett <[email protected]> wrote:
I will be opening a ticket with cambium but I wanted to let everyone know
this issues we just came across.
I updated all our 450 APs to 14.1.1 yesterday. On our 5Ghz 450s we use the
5.4 band. On all these APs the "Alternate Frequency Carrier 1" and "Alternate
Frequency Carrier 2" were reset to "none". when I go and set them back to what
they should be, save and reboot they still come back as "none".
Because of this if we experience a DFS event we have no other frequency to
hop to.
Additionally we have a couple APs that after the upgrade are now seeing DFS
events when previously they experienced no events...ever. We live in the
middle of the rocky mtns. so there really shouldn't be any events because of
all the granite clouds in the way ;-)
anyway, DFS seems to be broken on 14.1.1 and I wanted to let everyone know
before they apply the upgrade incase you need DFS to work properly.
-Sean
