I did look online or other brands of adapters for your application and found this one QGeeM USB Ethernet Adapter,USB 3.0 to 10/100/1000 Gigabit Ethernet LAN Network Adapter Compatible for MacBook Air/Pro,Surface Pro,iMac,Vista,Notebook PC with Windows7/8/10, XP. I have no ill will toward Apple and their tech support is not perfect but as long as i was patient we found a solution. Believe me i was and the support tech who was very helpful was shocked it worked. Then i was asked if I have the time to do a hardware test and it passed and then we did a clean install of Big Sur. Then i said how does two separate ports go at the same time and I really believe this happened on my OS update to Big Sur. They were already setting me up to send my computer in for repair. They were convinced that I had a hardware issue after trying a few things like SMC, PRAM etc. Not one vender displayed specs regarding System compatibility, just hardware compatibility.
I had two thunderbolt ports not working after updating to Big Sur and I started shopping for another adapter. Thats when i realized may be it its not the adapter compatibility since they don't come with any software drivers when you buy them. So if you plug it into a gigabyte it can do gigabyte and and if you plug it into 100 Mpbs it can do 100Mpbs. for example in your case the USB 3.0 (also known as SuperSpeed USB) has a maximum bandwidth rate of 5 gbps (gigabits per second. Then I realized after researching a little I realized ports have a max speed and the actual speed is driven by what device you plug it into. Hi bishopeen 'I was in your train of thought regarding speeds in thunderbolt and i thought my my Belkin adapter was not compatible with Big Sur.
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