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I bet this was a microwave dish, super common to connect buildings with line of site., and prone to fog and weather :)

The Wikipedia entry for FSO networking is pretty misleading. There have been commercial products on the market for quite a while.

It's more likely that it's a microwave link, though, right? Hence the betting.

I did no research, so hold no strong opinion. I’m in favor of lasers whenever possible. :)