Two main targets of PON power saving: • Continuation of lifeline voice service(s) with backup battery for a longer time, e.g. ranging from 4 to 8 hours in case of mains outage. • Power saving in nominal PON operation (adapted from G.sup45). Four possible solutions to be further studied: • Power shedding at UNI

Several OLT styles are supported (single chassis, multi-chassis, integrated multi-channel line cards, and pay-as-you-grow pluggable line cards). 1’. ONU applications and services The NG-PON2 system is intended to be a full-service access network. A key part of that is the extreme diversity of ONUs coexisting on a common PON. G-PON and

optical networks (G-PON): Enhancement band Defines wavelength ranges reserved for additional service signals to be overlaid via wavelength-division multiplexing (WDM) in future PONs for maximizing the value of ODNs. The details of both the coexistence element (CE) and the blocking filter at the ONU are described. As new PON systems are

applications described for G-PON, XG-PON, and XGS-PON, the higher capacity of HSP opens new possibilities. Examples of these are serving diverse 5G cell sites and various enterprises. Existing G/XG(S)-PON ONUs can remain in service alongside the HSP ONUs, allowing for easier upgrades. 2. ITU-T G.9804.2 –Higher Speed Passive

GPON systems are characterized, in general, by an optical line termination (OLT) system and an optical network unit (ONU) or optical network termination (ONT) with a passive optical distribution network (ODN) interconnecting them.

• Passive Optical Network (PON) system is a point-to-multipoint optical communication sytem. • Multiple (e.g. 16 to 128) ONUs comminicate with an OLT via optical splitter(s). • Popular PON systems use TDMA in upstream access.

GPON Time reference • G-PON uses periodic framing, with a superframecounter – This structure repeats approximately every 37 hours, providing an easy timing reference • During activation, the ONU’stransmission delay is measured, and an equalization delay is sent to the ONU – This delay is updated continuously for delay variations