I have an expensive piece of network equipment that has an SFP+ port on it. It came installed with a 10-gigabit fiber optic transceiver installed the port. According to the device's specifications, it supports both 1- and 10-gigabit rates via the SFP+ port. I don't currently have a 10-gigabit-capable device to plug into the other end, so I'd like to run it in its 1-gigabit mode.
Are SFP+ modules universal in the sense that I can just pop out the current fiber module and replace it with a 1-gigabit copper module that has an RJ45 in it? Or, would this be unsafe (or non-functional) in some way?