I am have almost completed an upgrade for a member school district. We went with “N”, but are having very disappointing results with the finished links.
Boards: 433AH
Cards: SR17
Antennas: 32 Db dish with DP feed horns
Distance 7 miles
Db level 68-70
Using 5 Ghz N only
Both chains are checked and CCQ is 85-100+ % with low traffic.
Once traffic gets past 3Mb, CCQ bounces all over the place and often dips into the single digits, with ping times going into 400-900 ms.
When traffic dies down, connection speed will come back to 54/130 or 130/130
Have tried every frequency in the 20 MHZ range, but nothing helps.
Sounds like either the dishes are not completely aligned or maybe the fresnel zone is obstructed. I would think at 7 miles with 32db dishes your signal should be in the 60’s; possibly 50’s if higher powered card. Those 4ft dishes have a very narrow path and are extremely sensitive; the azimuths and elevations need to be perfect.
Tower installer certifies all dishes are aligned perfectly now. I am getting -49db-52-db on 7 mile links, but still have the same problem. Band-width test always start at 20+ Mb, and then dwindle down to 4Mb (max) in a 10 seconds or less. The speeds never go back up and ping times run from 400-1000 ms, then drop back down to 1 ms when band-width test is terminated. CCQ is always 85-100% before running tests and link shows it is locked in between (N Wireless only) 117Mb-130Mb. I changed everything from bridged to routing between all interfaces, but that did not change throughput either.
I see I had a typo on my hardware. I am using SR71-15 cards on 433AH boards and using 5 Ghz Wireless N Only.
OK, seriously. You need to enable NSTREME as I outlined about and do the following:
Set HW Retries to 15 on both sides
Uncheck set Data rates tab to manual
Uncheck all 802.11a rates (no rates remaining)
Uncheck all MCS rates except for MCS8
Do the above on both sides of the link.
You should have a solid, high throughput link if you do these things.
If you get a solid link, raise the MCS rates until you are happy with the results. I prefer to lock in my rates to a specific one rather than letting it alternate. You have good enough SNR to do this.
No one is going to be able to help you more until you’ve done these things. Report back and let me know.
I was responding to the other person’s question with my last post.
OK.. I did everything you posted. It shows registration at 13 Mb, and band-width speed shows a total of 7-8Mb when testing “both”. That is almost twice as much as I had before, so making progress. I tested 5180, 5320, and 5745. All run about the same.
Turn on Adaptive Noise Immunity and set it to “AP & CLIENT MODE”.
Double-clikc on your wireless interface, go to the registration tab, double click on your connection, go to the signal tab, and give me a screen shot of that. Both client and AP please.
Also, let me see your HT MCS tab (client and AP), nstreme tabs (client and AP), and Tx power tab on the AP side.
