This doesn't work in fog. Space lasers are great. No fog. Everyone wants the 500 Terahertz frequencies to work because bandwidth. They have about 25,000 times the carrying capacity of say 20 Ghz. The lower Ghz stuff penetrates weather to varying degrees. Visible light not so much unless it's a vacuum which is perfect. They should move their nodes into space. Oh wait someone already did that.
It's not only fog. Depending on pupil size it can also be rain. But during my thesis 10y ago one of the big limitation on horizontal line of sight laser telecommunication was scintillation due to turbulence. And this phenomenon appear in clear weather condition with heat. So it was limited in clear and sunny weather.
I don't know what up time did there expect ? But the bandwidth should fluctuate a lot.
