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EFWilson
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Joined: Wed Feb 10, 2010 1:50 pm

Large HW Frame vs Frames difference

Fri Mar 07, 2014 12:44 am

Hi All

I am having a very large HW Frame vs Frames rate difference on one of my PTP links and am wondering if this could be caused by alignment? I have noticed that the Rx Rate keeps fluctuating between 6Mbps and 300Mbps. The two devices (SXT 5nD r2) are quite close to each other so I had to turn down the power to 10 to get signal to sit at -40. If I use winbox to connect to the remote device it keeps dropping the whole time however if I ping it the ping sits at 1ms with zero packet loss. Any suggestions would be really appreciated.

Signal Info (nstreme):
Tx/Rx Signal Strength -38/-38 dBm
Tx/Rx Signal Strength Ch0 -39/-39 dBm
Tx/Rx Signal Strength Ch1 -44/-46 dBm
Tx/Rx Signal Strength Ch2
Signal To Noise 72 dB
Tx/Rx CCQ 97/96 %
P Throughput 47003 kbps

HW Frames/Frames
Image

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Re: Large HW Frame vs Frames difference

Fri Mar 07, 2014 1:38 am

The signal must be between -60 and -65 for better performance.
-40 is too high
excessive signals do not increase stability or bandwidth, make the opposite....
 
lambert
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Re: Large HW Frame vs Frames difference

Fri Mar 07, 2014 2:43 am

Lower your output power some more. If you can set tx power to 1, the link should still work. I don't know if SXT's will allow that power setting or not.

I tend to suspect improper alignment when the chains have more then 3dB difference in the RSSIs.

However, If they are very close together, and you cannot lower the tx power anymore, I would intentionally mis-align the antennas to reduce the signal strength, even further.

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