#20643: Receive chain goes deaf and does not recover
-----------------------------+-----------------------------------
Reporter: ae6xe@… | Owner: developers
Type: defect | Status: new
Priority: high | Milestone:
Component: kernel | Version: Barrier Breaker 14.07
Keywords: ANI OFDM_LEVEL |
-----------------------------+-----------------------------------
Configuration:
* BB 14.07 r42549
* OLSR
Lay-of-the-land:
* Ubiquiti Rocket M5 XM with 19dBi 120 degree sector panel high mountain
location
* 3 ad-hoc connected stations:
1) Ubiquiti 23dBi AirGrid M5 XM H-pol (1) @ ~14 miles
2) Ubiquiti 23dBi AirGrid M5 XM H-pol (2) @ ~10 miles
3) Ubiquiti Rocket M5 XM with 30dBi RocketDish @ ~8 miles
* Channel 149
* Reproduced on 5Mhz, 10Mhz, and 20Mhz channel width.
* Unable to reproduce with Attitude Adjustment
* High RF congested metropolitan area in SoCal Orange County. Possible
noise source triggering the cycle.
* Goes to deaf state 1 to 3 times a day.
* Co-located Rocket M3 and M2 with respective 120 Sector panels.
Symptoms:
On the mountain Rocket M5, the H-pol antenna chain RSSI drops to ~noise
level and remains stuck. AirGrid OLSR links drop with intermittent ad-
hoc connections. Intermittent cross over of H-pol transmitted to V-pol
receive with AirGrids. "OFDM LEVEL" remains at 8/9 or 0/1.
Deaf State RSSI:
RocketDish
signal: -69 [-91, -69] dBm
signal avg: -68 [-92, -68] dBm
Airgrid (1)
signal: -85 [-97, -85] dBm
signal avg: -84 [-97, -84] dBm
Airgird (2)
signal: -89 [-97, -90] dBm
signal avg: -88 [-97, -89] dBm
Normal State RSSI:
RocketDish
signal: -66 [-69, -69] dBm
signal avg: -65 [-69, -68] dBm
AirGrid (1)
signal: -75 [-75, -85] dBm
signal avg: -74 [-74, -84] dBm
AirGrid (2)
signal: -74 [-74, -90] dBm
signal avg: -74 [-74, -91] dBm
Work Around: run an "iw wlan0 scan" and deaf state returns to normal
state.
This issue is affecting our http://www.aredn.org release timeline.
Related Notes:
1) we have removed all of our possible related code (extended part 97
channels) to test and isolate this issue.
2) Similar symptoms, but limited data points, have been observed on 2Ghz
Bullet M2 and NanoStation M2 devices. Links dropped out and "iw wlan0
scan" recovered.
Joe AE6XE
--
Ticket URL: <https://dev.openwrt.org/ticket/20643>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
_______________________________________________
openwrt-tickets mailing list
[email protected]
https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-tickets
