Modify

Opened 2 years ago

Last modified 18 months ago

#20643 new defect

Receive chain goes deaf and does not recover

Reported by: ae6xe@… Owned by: developers
Priority: high Milestone:
Component: kernel Version: Barrier Breaker 14.07
Keywords: ANI OFDM_LEVEL Cc:

Description

Configuration:

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

Attachments (0)

Change History (2)

comment:1 Changed 2 years ago by dman776

I'm watching this one too.

comment:2 Changed 18 months ago by valentt

Have you tested CC release? Also if you are using OpenWrt in point to multipoint setup expext MASSIVE performance hit when compared to stock firmware. Hint: it is because stock firmware uses TDMA. In point-to-point setups you won't have these issues...

Add Comment

Modify Ticket

Action
as new .
Author


E-mail address and user name can be saved in the Preferences.

 
Note: See TracTickets for help on using tickets.