G.984

Gigabit Passive Optical Network (GPON ) is a technology based on passive optical networks ( PON). It allows the users, data rates up to 2.5 Gbit / s in both downstream and upstream in the direction of providing.

GPON operating at a generic encapsulation (GEM), the Ethernet frames and data in time division multiplexing (TDM) on a GPON link can be transmitted. Unlike BPON data rates in the gigabit range could be realized with GPON in both directions. Thus defines the ITU Recommendation G.984 for the downlink data transfer rates of 1.25 Gbit / s and 2.5 Gbit / s The uplink is supported at speeds of 125 and 622 Mbit / s and with 1.25 and 2.5 Gbit / s. For the transmission of video, the ITU has defined separate wavelengths. Since video signals can be transmitted using IP protocol over GPON, it is conceivable that the separate wavelengths remain unused.

Distribution in Germany

In a pilot project, the German Telekom in 2009, began GPON FTTB based on the network topology in the Dresden districts Striesen and bladder joke introduce to offer DSL or VDSL Internet access with broadband format can. 75 percent of households in the area were connected with this technique to the broadband network. However, only the fiber optic cables were laid for buildings with fewer than five residential units, the associated GPON access technology but not installed due to high investment costs. ( These newly installed lines are now only later - as soon as technically available as part of FTTH connections, -. Use find ) Thus, 25 percent of households are in the area for the foreseeable future without Breitbandanschluss.Im 2013 was the development of the remaining building begun.

GPON has so far been used in all FTTH extensions of Deutsche Telekom.