06/02/2018
Long distance + very noisy + AF5XHD = much better performance
Reason for Installation
Upgrading a 21 mile link from AF5X to AF5XHD radios results in a significant increase of bandwidth capacity
Used Products
×1
×1
Location
Thornton, CO, USA
Description

We have a site where we are co-located with another company who has 20+ different 5GHz radios in use - just a little noisy...   We use the site for both AP sectors to customers and as a relay point for backhauls to one end of our system.   It's a 185 foot tower that's 21 miles from one of our main sites.   We have been feeding it with two parallel 5GHz links using AF5X radios on 3 foot dishes for years, and even though it's quite rural the link quality has been deteriorating over time.   We're limited to using 20MHz wide channels because of all the noise, and the AF5Xs just weren't cutting it any more.   So we upgraded the link to AF5XHDsHudsonTower.jpg

This is the tower on one end of the link - the radios are at the 95 foot level (the catwalk in the middle of the tower.   And below is the other end - a site with over a dozen 5GHz radios as wellBrittanyRoof.jpg

 

So both ends are very noisy with limited spectrum to make use of.   It's been a struggle for get adequate bandwidth between these sites, even with the large gain of the dishes due to the noise and the distance involved.BritHudsonAF5X.png

Here is the main page of the AF5X before the swap.   Note the signal level at -59 to -63 and the capacity at 80 and 27Mb - this was the best we could get on this link.   A year ago we easily saw double the capacity.   So we then swapped out the AF5Xs for AF5XHDs - same channel, channel width, no re-alignment of dishes, etc.   And here's the result

BritHudsonAF5XHD2.png

 

As you can see the signals are better (the HD can use higher conducted power than the X) which , in addition to the HDs superior receive sensitivity and higher achievable modulation rates raised the modulation to 10x and 8x resultiong in capacities of 70Mb and 115Mb - a big increase which will keep this link in operation for a while while we come up with an alternate path that's not so congested.

Jim

 

 

 

 

 

 

 

 

 

Long distance + very noisy + AF5XHD = much better performance

by ‎06-02-2018 07:54 AM - edited ‎06-02-2018 07:58 AM

We have a site where we are co-located with another company who has 20+ different 5GHz radios in use - just a little noisy...   We use the site for both AP sectors to customers and as a relay point for backhauls to one end of our system.   It's a 185 foot tower that's 21 miles from one of our main sites.   We have been feeding it with two parallel 5GHz links using AF5X radios on 3 foot dishes for years, and even though it's quite rural the link quality has been deteriorating over time.   We're limited to using 20MHz wide channels because of all the noise, and the AF5Xs just weren't cutting it any more.   So we upgraded the link to AF5XHDsHudsonTower.jpg

This is the tower on one end of the link - the radios are at the 95 foot level (the catwalk in the middle of the tower.   And below is the other end - a site with over a dozen 5GHz radios as wellBrittanyRoof.jpg

 

So both ends are very noisy with limited spectrum to make use of.   It's been a struggle for get adequate bandwidth between these sites, even with the large gain of the dishes due to the noise and the distance involved.BritHudsonAF5X.png

Here is the main page of the AF5X before the swap.   Note the signal level at -59 to -63 and the capacity at 80 and 27Mb - this was the best we could get on this link.   A year ago we easily saw double the capacity.   So we then swapped out the AF5Xs for AF5XHDs - same channel, channel width, no re-alignment of dishes, etc.   And here's the result

BritHudsonAF5XHD2.png

 

As you can see the signals are better (the HD can use higher conducted power than the X) which , in addition to the HDs superior receive sensitivity and higher achievable modulation rates raised the modulation to 10x and 8x resultiong in capacities of 70Mb and 115Mb - a big increase which will keep this link in operation for a while while we come up with an alternate path that's not so congested.

Jim

 

 

 

 

 

 

 

 

 

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Comments
by
on ‎06-02-2018 11:07 PM

The combination, distance & noise makes this interesting. Your upgrade shows a good example of what Ubiquiti is capable.

 

Speaking of it: there are distances advertised for which I never found "working proof" or a success story. A competitor shot a lin fom Pikes Peak (CO) to Cheyenne WY (@ Speer Rd from their pictures) which is a ~150mi link. They did not tell what effective bandwidth they reaced but stated using the 5GHz band through the noise bubble of Denver. Maybe someone has such distance links an performance figures. An yes, I know this is not really the right thread - but close.

Thx.

by
on ‎06-03-2018 01:37 PM

Well, here is a test of AF5Xs at 140 miles and 225Mb aggregate throughput.

https://community.ubnt.com/t5/airFiber-Stories/Distance-throughput-record-with-AF5X-230-Mbps-at-225K...

Actually done down in the Southern California area - curvature of the earth makes links this far few and far between.   I had a 2GHz commercial link from Tesuque Peak to Mt. Taylor (Santa Fe to Grants in New Mexico) back in the 1980s that was nearly 150 miles.   The distances are impressive, but remember that every time you double the distance you only add 6dB to the free space loss.   So it's more about the terrain and the noise/interference than just the distance...

Jim

by
on ‎06-04-2018 07:19 AM

Thanks for the Story Jim. 

Looks like upgrading will be a good idea.

by
on ‎06-11-2018 09:17 AM

That Tower looks like a former AT&T Long Lines Microwave site.

by
on ‎06-13-2018 11:31 PM

49dBm EIRP ?Hand

by
on ‎06-16-2018 06:55 AM

What informs your decision making to plan a new route for 5GHz radios vs. moving to licensed frequencies?

by
on ‎06-19-2018 04:42 AM

Almost same question above... Why not move to the 24ghz unlicenced freq instead?

by
on ‎06-19-2018 06:31 PM

24 GHz on a 34 km link?  Really?

by
on ‎07-02-2018 09:11 AM

I love those old ATT Long Lines sites.

by
3 weeks ago
@eejimm "Actually done down in the Southern California area - curvature of the earth makes links this far few and far between.  ."
Reason being the earth is flat Man Happy