bondmanp - that's just a filter there.
This is about cascading Cisco switches. Ethernet goes from the router to the Cisco. The Finisar transceiver goes into the gigabit port on the right. A fiber optical cable is connected to the transceiver and runs (3 meters in my case) to another Cisco switch.
Another Finisar transceiver into that second Cisco switch where the fiber optical cable connects. Then a short ethernet cable out to the streamer.