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MUM Europe 2020
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60ghz products, some clarification?

Fri Feb 14, 2020 5:16 am

Ok so we've had a bunch of 60ghz dishes deployed in the field for a while now and they seem to 'just work' which contradicts the information i'm reading on the wiki and is also vastly different to other 60ghz products on the market. I want to get some clarification on how they actually work, and to best use them in the real world

What do I mean by 'just work'? Well supposedly they have a 1 degree beam width, yet this is completely not at all our experience. I can literally point the dish 45 degrees off to the side and still pass >1gb/s on a 300M link. There seems to be almost no point in even trying to align them, because as long as they are pointing even roughly in the same direction they link up and often work at 1.7-2.3gbit/s of throughput. So why even bother aligning them? And why does MikroTik say its only a 1 degree beam when it clearly isn't
We also use Siklu 60ghz and they are extremely fine and will drop the link entirely if its more than about 2 degrees off center. Totally different to the MikroTiks
Honestly we don't bother to align them beyond "that looks roughly correct" because of this, easiest dishes ever to install because of this. But surely i'm missing something here?

So can someone explain how that works? And why should we bother to try and align them better?
Also the lights, when it's blinking <- does that mean the radio should be moved a bit further left? Or does it mean its too far left and it should be moved right? We don't use them because it seems impossible to have none of them flashing, and as above they often do 2.3gbit/s even when very poorly aimed

The next is we have some of them upgraded to licence level 4 and use them as multipoint. But the only information we get on the AP with other clients is 'Signal' and 'MCS'
What does 'signal' mean? since it goes from 0-100. How exactly is that number determined and should it be possible to get 100? As even when we try and align them correctly we still very rarely see 100. RSSI would be more useful but its not shown for each client, only on the main 'wlan60-1' interface and I don't know which client that refers to, so its useless to me

The last is in relation to rainfade. We have some links that are only 200m yet they drop out for a second or 2 in moderate to rain. I don't believe they should at that distance, our Siklu's don't. Maybe its related to the alignment above? But we also use them in point-to-multipoint mode so we can't align the AP to every client, we could however align each client perfectly to the AP, but we won't bother if its not going to help

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