Recommendation ITU-T G.984.3 describes the transmission convergence layer for gigabit-capable passive optical networks a family of flexible access networks capable of providing a range of broadband and narrow-band services, operating at the rates of 2.48832 Gbit/s downstream, and 1.24416 or 2.48832 Gbit/s upstream. This Recommendation includes the specifications of the following:

gigabit PON transmission convergence (GTC) layer framing;

upstream time division multiple access mechanism;

physical layer OAM messaging channel;

principles and signalling mechanism of the upstream dynamic bandwidth assignment;

ONU activation method;

forward error correction;


This Recommendation forms an integral part of the G.984-series of ITU-T Recommendations that, together, specify a single coherent set of access transmission systems.

The original version of Recommendation ITU-T G.984.3 was approved on 22 February 2004. It was subsequently expanded and complemented by Amendment 1 (07/2005), Amendment 2 (03/2006), Amendment 3 (12/2006) as well as the Implementers' Guide (06/2006).

This version of Recommendation ITU-T G.984.3 integrates all the earlier documents listed in the previous paragraph, providing necessary corrections and clarifications, and contains the new results of the standardization work performed by ITU-T Study Group 15 during the 2005-2008 study period.