Laptop has Anker USB ethernet adapter attached. That adapter is then plugged into the Plunder Bug. Then the Plunder Bug is plugged into an ethernet switch. The switch gets a link light but the Anker USB adapter does not. I swap out the Anker adapter with a TPLink adapter and it gets a link light. I've used the Anker adapter for probably close to a year at lots of different sites on lots of different switches and never had a problem with it.