I have an old box for Gigabit Ethernet over free space optical (FSO) link.
The model number and company don't appear to exist on the internet, the very-thin documentation (2 sheets) references what appears to be a private residence near Newbury (UK), and is dated 2004 ish. It's heavy metal box is not 19" but eyeball suggests 1U high, and claims to have been built in Russia.
Sadly I don't have the optics part or the counterpart.
Anyone be interested in seeing the insides, possibly in a video?