This USB to fiber converter provides reliable connectivitywhile protecting your network from problems with electronic interference – a common issue with copper Ethernet networks. The USBto fiber-optic converter is equipped with anoptical transceiver for 1000Base-SX networks, providingnetwork connectivity with a maximum range of 550 m over multimode fiber. Windows® and Mac compatible, the network adapter provides a 1000MbpsEthernet network connection and 1000Base-SX SC optical transceiver. This USBto fiber-optic converter lets you utilize the USB 3.0 (Type-A) port on your laptop or tablet to provide a secure fiber network connection.

Some vendors say that they will not work with the M1 (yet). USB to Fiber Optic Converter – 1000Base-SX SC – USB 3.0 to Gigabit Ethernet Network Adapter – 550m MM – Windows / Mac / Linux macOS includes several drivers for Aquantia Chips (at least the Intel version of macOS). Only solution is thunderbolt, but that's expensive (either Apple's Thunderbolt 3 -> Thunderbolt 2 -> Apple GbE adapter) or one of the various 10GbE adapters that use the Aquantia Chips. There are no other USB based GbE chips that I'm aware of on the market. They must be used with a proprietary driver as they didn't supported the CDC-ECM mode. Not sure whether Realtek will rework their driver, or just abandon the Mac platform for their drivers. Apple blocked the kernel APIs for USB based NICs in Big Sur (and replaced them with DriverKit userspace APIs). Realteak had a driver for macOS up to Catalina. ) is done by the CPU instead of the NICs hardware which a) causes high cpu load during high network activity and b) can cause instability with some implementations.

In this state, there's no offloading which means: All the heavy lifting (checksumming. Instead, the NIC also supports basic CDC-ECM mode which macOS does have a driver (AppleUserECM) for. All those adapters (very likely) use the Realtek RTL8153 USB NIC.

Startech usb to ethernet mac