UMN:CLI User ManualV5812G45211 GPON ConfigurationGigabit Passive Optical (GPON) technology has the active network elements OLT(Optical Line Termination) at the central office and ONU/ONT (Optical Network Unit /Termination) at the subscriber site.Typical GPON configuration consists of a single PON port at the OLT and a number ofONUs connected to it over a single fiber feeder.Generally, a Time Division Multiplexing (TDM) is used in the downstream datatransmission. OLT broadcasts data to every ONUs using TDM approach. Every ONUreceives each downstream frame and pinks up only that data addressed to it by the OLT.Optionally, FEC coding and AES encryption are applied to the user data.To deliver data to OLT in upstream direction, the OLT implements a Time Division MultipleAccess (TDMA) approach. ONU (ONT) receives data from the user ports and combinesthem into bursts. Each ONU (ONT) transmits its data in a strict accordance with theBandwidth Map generated by OLT for the synchronization. Using DBA mechanism OLTcan rearrange upstream bandwidth to provide more resources to those ONU tightlyloaded with traffic.The ONU provides network termination for a Passive Optical Network (PON) in the homeor business. The ONU connects via a high speed interface to the PON network andprovides subscriber access to data (Ethernet), voice (POTS) and video services. GPONgives edge networks an unparalleled bandwidth advantage in their ability to offer trulyhigh speed triple play service (i.e. voice, video and data) especially when compared withexisting cable or DSL services.The following figure is the example of the GPON network set up.Fig. 11.1 Example of GPON NetworkBasic Operation• Configure OLT and ONU (ONT) in GPON-OLT Configuration mode.• For common ONU (ONT) configuration, create a profile in ONU Profile Configurationmode.• If the created profile is modified, the profile will be applied to the ONUs (ONTs)automatically.
