What do I need to install the DEM-420X module?
You can install the DEM-420X module on a D-Link xStack switch,models:
- DXS-3326GSR
 - DXS-3350SR
 
But a transceivers is required to benefit from 10GE transfers,models:
- DEM-421XT
 - DEM-422XT
 
You can install the DEM-420X module on a D-Link xStack switch,models:
But a transceivers is required to benefit from 10GE transfers,models: