SFP Backward Compatibility

Hi Ma'am / Sir,

Good Day! I have an inquiry with regards to the 1 GB SFP and 10 GB SFP+ Ports. If I plugged a 1 GB SFP Module into a 10 GB SFP+ Port of a Network Device, will there still be a connection, and what will be the output? How about if I plugged a 10GB SFP+ Module into a 1 GB SFP, what will be the outcome? Thanks!
 

Gabriel Pike

Posts: 286   +79
In the first scenario assuming the device supports the SFP module, then 1 Gbps. In the second scenario it probably will result in no link. A 10 Gbps module in a 1 Gbps port usually will not even show a module present from what I have seen.