This variable defines the mode of an EPON device and
provides information on the mode in initialization -
ready for registration as defined by the [802.3ah]
clause 64.
When notReady(1) the device is not ready for operation.
When inProcess(2) the device is in initialization
process.
When ready(3) the device is ready for registration.
Writing can be done all the time.
This attribute is relevant for an OLT and an ONU.