Like with most other cisco devices, you can use non-cisco compliant SFP transceivers under the Nexus OS. Cisco frowns on this, but have made exceptions for the use of these devices within various cisco hardware. Here's the copper transceiver that was enabled for the nexus 1U switch.
Now when you install this as-is, the switch will complain with the following log message. But you can use the service unsuported-transceiver command in the global context for allowing this unsupported transceiver.
By doing this cisco will execute the warning message and allow the transceiver. It will never show up in the inventory output but will be operative.
So you have the option for using various transceivers , but be very careful on what you install in a SFP slot YMMV.
NSE ( Network Security Expert) and Route/Switching Engineer.
kfelix -----a----t---- socpuppets ---dot---com
=( * * )=