Thanks, i have no need to go beyond 100m. It´s more the question, why/where Marvell came up with the 170m distance and where to use it. As you said the remote NIC also has to support it.
I guess the magnetics modules, which is soldered on the pcb, would also have to support this distance, not only the transceiver itself.
I have never had the need for at fiber connection between 2 locations with only 8 available ports to use. I always wonder why those small switches has fiber support, more likely the change is, i would be using a fiber to cobber converter in the last to ports for client connectivity.