Backhaul 5400 10MB max distance?

Hi.

Just a question about the canopy backhaul 5400 10 MB with reflector.
I tried this equipment on a distance of 20 kilometers and I didn’t have any luck on the link.

I would like to know what kind of equipment you are using for links on that distance.

A quick analysis says this will work with about 16dB of margin.

- Received power level : -69.127 dBm (78.186 µV)
- Receiver’s threshold : -86.000 dBm (11.207 µV)
- Thermal fade margin : 16.873 dB This current link setup should be possible.
- Probability of outage : 1 %
- Total free space path loss : 133.118 dBi over a path length of 12.427 miles (20.000 kilometers)
- Peak transmitted EIRP : 46.496 dBm (44622.513 mW)

Assumptions:

- Clear Line of sight - Fresnel zone is 46’ at mid point
- Radio at max power (1W ERP)
- 18dB Canopy reflectors
- Noise floor below -86dB



Did you do any type analysis prior to purchasing and installing the equipment?

Did you perform a spectrum analysis to see where the noise floor is eat each end?

Did you observe any other 5.4GHz equipment at either tower?

We achieve 20 km with regular AP and SM with original Canopy reflector dish. With backhauls we do double.

Do a spectrum analysis on both sides of the link, choose some free channel and do careful alignment. You can use the hidden menu and choose 5470 mhz. This channel is probably not used by anyone. Or put AP on the higher side of the link, try to align it with SM with the highest possible signal. This way you will have one side of the link good, and the rest should be easy.

Are those backhauls P10 or P9?

Jerry,

Noise floor at -87 is the most important problem. We have seen ,
during both days, a -83/-84 noise floor.
What program you are using for the link estimation ?
We have planned a PTP400 equipment but the client want to
evaluate the PTP100.
Spectrum is clear below 5550 and above 5670.
We have experienced VERY high noise pulses around 5600


Erkan,

It is good to know that Canopy can sustain a link up to 20km.
Do you use reflectors at both ends ? (SM and AP ?)

And for your question, the backhauls are P10.

We don’t use reflectors at the AP side. With the original equipment (Adv AP+SM+RD27 and perfect Fresnel zone) we have achieved 42 km.

Be careful with that P10 hardware. 10-20% of all P10 units we received are not good. Try to do the link in the office first, switch the master and slave and see if they have the same results.

Try getting the two to link up in your offices. If erkan is having issues with P10 equipment, it’s a good idea to test before going through the trouble. You could be wasting your time.

Once you know these will link up, try the installation again on the quietest frequency you have in 1X mode. The specs say typical LOS range is 16km so you may be pushing it.

Clear LOS is a must. Anything even close to the 43’ diameter Fresnel zone will cause problems. If you are running any 5.4AP’s within 5 miles of these towers you will likely have issues.

-83 is not too bad. The link analysis indicates -69 at the SM which should link up. I used this link calculator: http://www.ecommwireless.com/cgi-local/ … s.main.cgi

10 mbps backhauls don’t have 2x mode option.

16 km way to short for 5.4 Ghz backhaul. We do these distances with satellite reflector dishes.

erkan wrote:
10 mbps backhauls don't have 2x mode option.


Thanks!

erkan wrote:
16 km way to short for 5.4 Ghz backhaul. We do these distances with satellite reflector dishes.


Can you clarify that? I assume you mean 16km is too far for a 10M 5.4 BH using the Canopy reflectors so you use larger satellite dishes for more gain?

Jerry,

We use this reflectors for all installations above 2 or 3 km.



We buy them from Greece, as I think :slight_smile: They are about 15 euros a peace. With this we do 10 miles - 16 km with no problems - AP to SM. We use the original ones for distances higher than that. Usually 25 km are not a problem.

We use the originals for backhauls because we don’t want to pollute the spectrum, with the lowest power level possible. And these distances are possible even in the enviorment with high Canopy interference. Of course everything is synced.

Hi!

Thanks Erkan and Jerry!

Your opinion and your expirience in this subject was very helpful!

Thanks again.

Jerry Richardson wrote:
A quick analysis says this will work with about 16dB of margin.

- Received power level : -69.127 dBm (78.186 µV)
- Receiver's threshold : -86.000 dBm (11.207 µV)
- Thermal fade margin : 16.873 dB This current link setup should be possible.
- Probability of outage : 1 %
- Total free space path loss : 133.118 dBi over a path length of 12.427 miles (20.000 kilometers)
- Peak transmitted EIRP : 46.496 dBm (44622.513 mW)

Assumptions:

- Clear Line of sight - Fresnel zone is 46' at mid point
- Radio at max power (1W ERP)
- 18dB Canopy reflectors
- Noise floor below -86dB



Did you do any type analysis prior to purchasing and installing the equipment?

Did you perform a spectrum analysis to see where the noise floor is eat each end?

Did you observe any other 5.4GHz equipment at either tower?


What software did you use to compute this?
http://my.athenet.net/~multiplx/cgi-bin ... s.main.cgi