18KM PtP Wireless long-haul at 2.5Gbps - solution.

netsnail

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Jan 21, 2021
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@netsnail - maybe you should call in a company that does radio links? If you're speaking of >99% availability you'll want to have regulated spectrum. To get to 2.5 Gbps you'll want probably need 256 MHz channels, dual polarized at a fairly high order of modulation. To design this and take rain fade into account you'll want to have access to Pathloss or similar. The distance a link can do depends on frequency, antenna gain, transmit power, receive threshold (for the specific modulation), rain fade... It's not merely a function of equipment.

The Huawei RTN series can do it, if you have the right outdoor units, antennas, spectrum, modulation etc. So can the Ericsson Traffic Node series, the SIAE ALCplus2 series. Siemens has radios that can do this, as has Alcatel Lucent, Ceragon, Siklu (but 80 GHz at 18 km simply is a terrible idea, they have radios in lower bands).

There are a few companies who might be willing to take on such a project. You can try Comsol - I think they have operations in Swaziland. You can try Telsaf Data as well.



Very true. However, if a radio planner who knows what he's doing plans a link for 1 Gbps he's pretty likely to get 1 Gpbs.
Thanks for the insight, I discussed this with MIRO but since last week we received zero feedback on this, patience and time is in limited supply.

Will avoid the 80ghz radios. This was my hunch as well but had nobody to confirm.
 
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netsnail

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Jan 21, 2021
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First start on what spectrum you can use. You would need to use some radio planning software to plot the links.
Generally you are looking at +- R200k for two complete links excluding switches, highsite rental etc.
Recommend any free or trail software? Had a look at Pathloss, seems to be pay to play.
 

killerbyte

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That piece of kit will get you to 2Gbps, so maybe run two links and do 4Gbps so the client has room to grow.
 

WIRUlink

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Jul 24, 2016
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Do a link calc for 80GHz. It may work at that distance in good weather, but uptime will not be great. The Siklu EtherHaul 10Gbps radio is a much better option as it will allow more steps of demodulation in "bad" weather before it will disconnect. The lower modulation (slower) radios will disconnect much sooner.

But 18km sounds like too far to get any sort of decent link (without calculating). 11/13/15GHz licenced is probably a better choice, especially with Swaziland getting a lot of rain.

Use a 17GHz/18GHz (or even 5GHz if you must) as active standby to improve availability/uptime. In bad weather, you will not have the full throughput, but it'll atleast not go down. Aviat has dual radio in single "box" radios with high modulations that will give better speeds than something like the SIAE AlfoPlus 17GHz.


If you need the higher speeds all the time, you will have to build additional hops to keep the 80GHz links under 5km apart.

Be sure to do the link calcs with correct weather info before taking this on.

Make sure about spectrum and other regulations in Swaziland as it probably differs from SA.


Hope you come right and are able to help your customer.
 
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