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New Member
Posts: 30
Registered: ‎08-22-2015
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AF5X short links, must run almost full power to achieve high link speeds

Having a strange problem, we have two AirFiber 5X links, one is 1.6km and the other 350 meters. The 350 meter link in particular, must be run at close to full EIRP in order to achieve max throughputs.

 

I have tried tuning power down, but the modulation rate starts dropping, and so does the link speed. Other links I have tuned show a peak at the right power level, decreasing too at higher powers, as would be expected.

 

Can anyone shed some light on this?

 

See below - the link was briefly ran on licensed spectrum to remove interference/noise from the equation, but this is still observed. Modulation rate on the screenshot is 8X, but it drops to 4X every so often.

 

KON_KIK.png

New Member
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Registered: ‎03-28-2014
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Re: AF5X short links, must run almost full power to achieve high link speeds

Your signal level is to high in your attached screen shot. Are you running the 30db antennas on a 350 meter link? Thats way overkill. Your going to have all sorts of alignment issues on that short of path. The larger antennas are much harder to properly align on short links. You might be sitting on a sidelobe and not know it due to the  close proximity of the antennas.

New Member
Posts: 30
Registered: ‎08-22-2015
Solutions: 2

Re: AF5X short links, must run almost full power to achieve high link speeds

Thanks for the suggestion, I need to get on site to check alignment, but another AF5X link we have shows good performance under "normal" power tuning at less than 1km.
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Registered: ‎03-26-2012
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Re: AF5X short links, must run almost full power to achieve high link speeds

For 350? There are better solutions for this short path....

New Member
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Registered: ‎08-22-2015
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Re: AF5X short links, must run almost full power to achieve high link speeds

Can you elaborate? We have tried wider beamwidth devices and they get drowned in noise. We operate in an area where the regulatory body is non-existant, and there are dozens of illegal WISPs running in Russian mode, everything turned to 11. For stable, reliable throughput, the AF5U and AF5X have proven very good.

These are links that carry 200 to 300 Mbps of traffic most of the time, so we cannot fool around.
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Re: AF5X short links, must run almost full power to achieve high link speeds

New Member
Posts: 30
Registered: ‎08-22-2015
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Re: AF5X short links, must run almost full power to achieve high link speeds

[ Edited ]

We have tested all Mikrotik options and they suffer from noise a lot more than Ubiquiti. We now run Ubiquiti on all PtP and sectors, and SXTs as CPE. We could not get any form of stable or high throughput on Mikrotik 802.11 or NV2 etc.

 

Besides 60GHz is licensed in the area we operate.

Member
Posts: 186
Registered: ‎03-26-2012
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Re: AF5X short links, must run almost full power to achieve high link speeds

[ Edited ]

This Device delivers 1 GBit easily 

in the most parts of the world 60Ghz is free to Use

Ubiquiti Employee
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Re: AF5X short links, must run almost full power to achieve high link speeds

Could you post screenshots with the power turned down?

I would expect issues with modulation at this distance and EIRP, but it should get better as you turn the power down.

Would you happen to have some installation pictures?

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