This looks like the infrared laser system that I worked on at a startup from 1980-1992. That system would create a full-duplex link running at either E1 or T1

This looks like the infrared laser system that I worked on at a startup from 1980-1992. That system would create a full-duplex link running at either E1 or T1 speeds, with a distance limit of about 1 mile. I remember there were about a dozen systme shipped worldwide. There was one in canada. Another was sold to Alameda County, Calif. Another made a 2-path jump between some high-rises in New York City. Still another was in Malasia, used by a bank. There was also one that was located to straddle the Texas-Mexico border for a Chtsler factory to allow communications between the two factories and it wasn't 'legal' to string a cable between the buildings wuith the border being between. That one was frequently getting sent back to me for 'repair', the biggest issue being vandalism of the attached rifle scopes on the Mexico side. Which then required new rifle scopes, and a re-calibration on our field in Golden, Colo. Our company was named Telecommunication Products Inc., which was bought out by a company that was deeply involved in leasing TV-service to hotels. That's when the laser really died.