Dynamic bandwidth assignment triggered low-power mode

A method for managing low-power modes of optical network units, ONUs, configured to communicate in a passive optical network, PON, with an optical line terminal, OLT;

• wherein the OLT comprises a dynamic bandwidth assignment, DBA, engine configured to dynamically assign bandwidths to traffic-bearing entities within the ONUs for a future DBA interval by allocating transmission opportunities to the traffic-bearing entities within one or more frames of the future DBA interval;
• wherein a DBA interval comprises at least two successive frames;
• the method comprising:
• by the OLT, determining low-power opportunities for the respective ONUs based on the allocated transmission opportunities during a next DBA interval;
• wherein low-power opportunities are periods of one or more successive frames during the next DBA interval without transmission opportunities allocated to the traffic-bearing entities of a respective ONU;
• by the OLT, notifying the respective ONUs about the low-power opportunities;
• and
• by the respective ONUs, switching one or more circuitries to a low-power mode based on the low-power opportunities.