The back panel has three major functional areas: the power supply/cooling units, a control panel, and one or two shelf controller modules.
At the back panel of the ES2O or ES3O , the LED state:
. White indicates the expansion shelf is off.
. Flashing green indicates that the expansion shelf and the DD appliance are establishing a connection.
. Solid green indicates the connection has been established.
. Amber indicates a connectivity problem.