Question: can 10g sfp+ run at 1g?
Answer: In All Cases, 10Gb SFP+ Optics Cannot Be Used on 1G SFP Port As we know, once a module is installed, the speed of the port is decided. Most SFP+ slots are backward compatible with SFP modules to run at 1G speed. However, the SFP slots on Gigabit switch cannot support the 10G speed required by SFP+ modules.