If both your power light and Optical light are green, then the next thing to check id the UNI-D lights on the unit.
There are four UNID-D ports on the device, on one of which your service is provisioned and which port is in use can vary, but it is usually the UNID-1 port (if you are unsure, check out the activation email you would have received from our Provisioning staff when your service was first connected)