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Wireless Bridge is falling down

I have problem with my point-to-point wireless connection between Wireless Bridge AIR-BR350 (in AP mode) and Workgroup Bridge AIR-WGB350. I use Cisco equipment. The distance between points is about 4 km. The connection worked very well for eight months, but recently I've been having occasional problems. From time to time the connection goes down and up, down and up. I exchanged both devices for new ones and both antennas (AIR-ANT1949 13.5dBi) with new. The log output from WGB is:

1054:45:48 I connected to parent 00409653f494 BR350-53f494
1054:45:45 E Radio Error: 9 Queue full discards
1504:45:40 E Radio Error: 5 Queue full discards
1504:45:35 E Radio Error: 5 Queue full discards
1504:45:30 E Radio Error: 21 Queue full discards
1504:45:25 E Radio Error: 5 Queue full discards
1504:45:20 E Radio Error: 4 Queue full discards
1504:45:15 E Radio Error: 4 Queue full discards
Can you explain how I can solve this problem or point me to a resource that explains this log output?
The Wi-Fi Alliance, formerly WECA, currently tests and certifies products that implement several 802.11 standards, including 802.11a, 802.11b, 802.11g and a snapshot of 802.11i known as Wi-Fi Protected Access (WPA). This fall, new certification programs will become available for the final version of 802.11i (WPA2) and a snapshot of 802.11e referred to as Wireless Media Extensions (WME).

A list of Wi-Fi certified products can be found at the Wi-Fi Alliance Web site. There, you can search for 802.11a, 802.11b and 802.11g products, or any combination thereof. All 802.11a/b/g products certified since late 2003 have been required to support WPA, but you can also view a list of products tested for WPA on that page. All Wi-Fi Certified products are eligible to wear a logo that identifies which tests they have passed -- click on the "View Wi-Fi Certifications" button next to each product to obtain that information.

This was last published in July 2004

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