The Comprehensive/Krame 611R is a video line receiver; it accepts a signal over Fiber Optics utilizing ST connectors, and outputs composite video. With a receiver/transmitter combination, cable runs of 5 kilometers are possible.
Fiber Optics
Fiber optics carries the signal much farther than coax cable, and is lighter. Signal transmission of up to 5 kilometers is possible.
Ground Isolation
Another advantage of fiber transmission is complete ground isolation between source and display.