Recommendation ITU-T G.987.3 describes the transmission convergence layer for 10-gigabit-capable passive optical network systems – a family of flexible access network systems that operate over a point-to-multipoint optical access infrastructure at nominal data rates in the order of 10.0 Gbit/s in at least one direction, while providing a wide range of broadband and narrow-band services to end-users. Amendment 1 extends to the ITU-T G.987.3 concept of cooperative dynamic bandwidth assignment (DBA) and the general DBA framework, which have been developed in the context of ITU-T G.989.3, and extends the maximum number of the burst allocation series per optical network unit (ONU) in a BWmap to 16.