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ITU-T Recommendation G.984 is a family of recommendations that defines gigabit passive optical networks (GPON) for telecommunications access networks. The first version was ratified in 2003. The most recent version comprises four recommendations:
- G.984.1, Gigabit-capable Passive Optical Networks (GPON): General characteristics, 2008, with amendment 1 (2009) and 2 (2012)
- G.984.2, GPON: Physical Media Dependent (PMD) layer specification, 2003, with amendment 1 (2006) and 2 (2008).
- G.984.3, G-PON: Transmission convergence layer specification, 2008, with amendments 1 (2009), 2 (2009), 3 (2012) and erratum 1 (2010).
- G.984.4, G-PON: ONT management and control interface (OMCI) specification, 2008, with amendments 1 (2009), 2 (2009), 3 (2010), erratum 1 (2009), corrigendum 1 (2010), and an implementer's guide (2009).
- G.984.5 Enhancement Band, 2007, with amendment 1 (2009) Coexistence with future WDM PON technology on the same medium.
The GPON OMCI recommendation G.984.4 draws on G.983.2, which defines the BPON management model. However, G.984.4 removed all references to ATM. G.988 is a stand-alone OMCI recommendation and supersedes G.984.4 except for G-PON specifics that are not defined in G.988. Future work on the PON management model is expected to appear only in the GPON space.