I sent this to support, but I wanted to post this to the public forum as well for others to see / respond to.
I have the following problem between a RB532v5 with R52H and a RB133c with R52 (might be CM9 I can’t remember).
Anyone have any ideas?
Scott
hardware configuration?
AP Wireless Settings
/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=yes allow-sharedkey=no \
antenna-gain=3 antenna-mode=ant-a area="" arp=enabled band=2ghz-10mhz \
basic-rates-a/g=6Mbps basic-rates-b=1Mbps burst-time=disabled comment="" \
compression=no country="united states" default-ap-tx-limit=0 \
default-authentication=yes default-client-tx-limit=0 default-forwarding=no \
dfs-mode=none disable-running-check=no disabled=no disconnect-timeout=3s \
frame-lifetime=0 frequency=2447 frequency-mode=regulatory-domain \
hide-ssid=no hw-retries=7 mac-address=00:0C:42:1F:09:B4 \
max-station-count=2007 mode=ap-bridge mtu=1500 name="wlan1" \
noise-floor-threshold=default on-fail-retry-time=100ms \
periodic-calibration=default periodic-calibration-interval=60 \
preamble-mode=short proprietary-extensions=post-2.9.25 radio-name="RBP AP" \
rate-set=default scan-list=default security-profile=default \
ssid="BrevardWireless-RBP" station-bridge-clone-mac=00:00:00:00:00:00 \
supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps \
supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps tx-power-mode=default \
update-stats-interval=disabled wds-cost-range=50-150 \
wds-default-bridge=bridge1 wds-default-cost=100 wds-ignore-ssid=no \
wds-mode=dynamic wmm-support=disabled
Client Wireless Settings
/interface wireless
set 0 ack-timeout=dynamic adaptive-noise-immunity=yes allow-sharedkey=no \
antenna-gain=3 antenna-mode=ant-a area="" arp=enabled band=2ghz-10mhz \
basic-rates-a/g=6Mbps basic-rates-b=1Mbps burst-time=disabled comment="" \
compression=no country="united states" default-ap-tx-limit=0 \
default-authentication=yes default-client-tx-limit=0 \
default-forwarding=yes dfs-mode=none disable-running-check=no disabled=no \
disconnect-timeout=3s frame-lifetime=0 frequency=2447 \
frequency-mode=regulatory-domain hide-ssid=no hw-retries=7 \
mac-address=00:0C:42:1B:42:98 max-station-count=2007 mode=station-wds \
mtu=1500 name="wlan1" noise-floor-threshold=default \
on-fail-retry-time=100ms periodic-calibration=default \
periodic-calibration-interval=60 preamble-mode=short \
proprietary-extensions=post-2.9.25 radio-name="EDC" rate-set=default \
scan-list=default security-profile=default ssid="BrevardWireless-RBP" \
station-bridge-clone-mac=00:00:00:00:00:00 \
supported-rates-a/g=6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps \
supported-rates-b=1Mbps,2Mbps,5.5Mbps,11Mbps tx-power-mode=default \
update-stats-interval=disabled wds-cost-range=50-150 \
wds-default-bridge=bridge1 wds-default-cost=100 wds-ignore-ssid=no \
wds-mode=dynamic wmm-support=disabled
What Hardware are you using?
If you look at what he wrote or the winbox screenshots and ask again, then maybe you would know 
/Henrik
Nope, it’s not in there.
Hmm okay, i see a 133 and a 532A
/Henrik
But no radio information…
R52H + R52/CM9 !?
oops.
Change hardware retries back to 15.
What are your signal strengths?
Signal strengths look optimal, connection stats look optimal. Also I should have mentioned (and you will see it in winbox image below) that I have two clients connected to this AP. A RB133c and a RB333. The 333 stays connected fine the RB133c is the only one with the problem so if the AP were doing something silly it should affect both clients. Its not.
RSSI Info
Thanks,
Scott
Decrease the power on both ends until your links are running -70ish
Jwcn, I appreciate your time in replying to my post, but I have to say that if MT radio gear has to have -70 or higher signal strength then its broke. Also, no other gear I have (and there is a lot) has this problem even with signal strengths much lower - 40-60
My target RSSI on every link is -60
I’ll adjust the power just because you mentioned it and I do respect your experience and input. I don’t expect it to fix the problem however, and if I drop the power on the AP then it will affect every other further out client I plan to have negatively. I’ll report back my findings.
Scott
Ok, following suggestions above I updated the routerboard firmware on AP and two clients. I also adjusted all three so receive was -66 all the way around. About 10db less power than was running originally.
The problem is exactly the same, no change in the “no beacons received” and error msgs in log files in the past two hours since this change. So its not the firmware and its not the power.
This was happening on v2.9.50 which prompted me to upgrade to v3.1. I am now starting to suspect the RB133c or the radio card in it. I have new equipment showing up tuesday I am swapping it out to see what happens. I’m going to leave the current radio card in place and just swap out the RB133c for a RB144. Then I’ll reploy (new word) the RB133c with a new R52H and see which, if either, the problem follows.
Any suggestions between now and then I’m all ears.
Scott
MT support looked into this, says configs look good. Try to change preamble type to long or both and they asked a few more questions.
I changed the preamble on the radios and it did not change anything. Still waiting for suggestions prior to the replacement gear arriving tomorrow.
Scott
Ok… I didn’t expect this. Today I swapped out the RB113c and R52 having the problem that has been the topic of this post with a new RB411 and another R52 I had. Only thing thats the same is the case, antenna and power supply. But none of that should matter.
Problem continues with the new hardware at this location. Very odd. I just changed freqs for fun to see if that makes a difference.
The only other thing now in the back of my mind is that this radio is mounted to a metal building wall aiming at a tower behind another metal building about 100-150 yards away. I’m wondering if there are reflections going back and forth between buildings or something. Just doesn’t make sense that it happens randomly and had nothing to do with the routerboard or radio card - at least that I can tell.
ideas?
Switched freqs again and the problem went away… Even though I couldn’t see the rf energy when scanning etc I have to assume it was there causing me interference. At least its working now and there isn’t a mystery any more.
I also have a problem with a site with lots of interference where it seems that 3.0/1 are having more problems than 2.9.xx. Changed cards, antennas, cables, etc but only after labouring through frequencies, now working better.
Have you tried enabling nstream and disable csma? Might help?
It’s an AP so can’t enable NStream.
What does CSMA do?