Mini Unmanaged 2x 10/100/1000Base-T RJ45 to 1x 1000Base-X SFP Slot Gigabit Ethernet Media Converter, American Plug Standard

I cannot comment on reliability or durability, but wanted to comment on functionality, specifically around the port isolation mode.

These appear to operate as a 3-port switch. When port isolation is disabled, all ports can pass traffic between each other. This supports the media conversion because you essentially uplink two switches together over fiber and get copper ports at each end.

In port isolation mode, the converter seems to accept only untagged frames on the copper ports, and then for TP1 ingress frames, it applies vlan tag 222 across the fiber uplink and for TP2 ingress frames, applies vlan tag 333 across the fiber. These are then obviously stripped off at the other end as the frames egress the copper ports and vice versus.

I had wanted to use these to pass two different uplinks over fiber but some of my traffic is already tagged with a vlan, and the converter seemed to drop all frames that were tagged on ingress of the copper ports, so I'll have to run two fiber links for my use case.

Other than that, they seem to function fine, but the bandwidth will obviously be limited to 1Gb total between both copper ports since there's only a single gigabit fiber port connecting the two media converters.

I've been using the UMC-GA1F2T for some months now, and it has well exceeded my expectations. It provides an exceptional level of quality and efficiency.

The user interface is simple, and the overall quality is high.