The first time the device is turned on may take a long time (5-6 minutes). The device will boot (the indicator on the front panel will turn red to green), create private keys for SSH and initialize the serial number of the device, and reboot again. When the indicator turns green for the second time, you can start working with the device.
You may need to access the controller console to configure the controller. This can be done either over the network via SSH or by connecting directly to the Debug UART port.