GPON

PON Architecture

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PON Architecture:

Like every other field, PON technology has its own terminology

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  • the CO head-end is called an OLT
  • ONUs are the CPE devices (sometimes called ONTs in ITU)
  • the entire fiber tree (incl. feeder, splitters, distribution fibers) is an ODN
  • all trees emanating from the same OLT form an OAN
  • downstream is from OLT to ONU (upstream is the opposite direction)

PON Architecture Diagram:

PON Architecture
PON Architecture

OLT (Optical line terminal)

OLT is a terminal equipment connected to the fiber backbone. It sends Ethernet data to the ONU, initiates and controls the ranging process, and records the ranging information. OLT allocates bandwidth to the ONU and controls the starting time and the transmission window size of the ONU transmission data.

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PON Advantages

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PON Advantages: Shared infrastructure translates to lower cost per customer  minimal number of optical transceivers  feeder fiber and transceiver costs divided by N customers  greenfield per-customer cost similar to UTP [boxads] Passive splitters translate to lower cost can be installed anywhere no power needed essentially unlimited MTBF Fiber data-rates can be upgraded as technology improves … Read more