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eSight V300R009C00 Operation Guide 10

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GPON Overview

GPON Overview

Passive Optical Networks (PON): use a point-to-multi-point (P2MP) network architecture to transmit data through optical fibers. PON provides access for multiple users, supports high-rate access, and saves optical fiber resources.

Mainstream PON technologies include Gigabit Passive Optical Network (GPON) and Ethernet Passive Optical Network (EPON).

The GPON technology is a new generation passive optical access standard based on the ITU-TG.984.x standard. It features high bandwidth, high efficiency, large coverage range, and abundant user interface. It is an ideal choice for many enterprises to effectively use the service bandwidth on access networks.

A typical GPON network consists of three components: Optical Line Terminal (OLT), Optical Distribution Network (ODN), and Optical Network Unit (ONU). Figure 17-4 shows the network architecture.

Figure 17-4 GPON network architecture

The basic concepts about GPON are as follows:

  • OLT: indicates an optical line terminal that is an aggregation device placed at the central office to terminate the PON protocol.
  • ONU: indicates an optical network unit that is a network device connected to the user side. It is responsible for forwarding upstream data to the user side and selectively receiving downstream broadcast data from the OLT. Generally, it is placed near end users, for example, in the corridor, at home, or along the roadside.
  • ONT: indicates an optical network terminal that provides the same function as an ONU. The difference is that the ONT is directly connected to end users but another network may exist between the ONU and end users.
  • POS: indicates a passive optical splitter that connects the OLT and ONUs. It splits one input into multiple inputs, and is not connected to any external power. It centralizes upstream data and delivers downstream data. It is difficult to monitor the POS because it is a passive device; therefore, it severely affects network maintenance.
  • ODN: indicates a pure passive optical distribution network that consists of passive optical components such as optical fibers and cables, optical connectors, and optical splitters. It provides the optical transmission channels between the OLT and ONUs.
Updated: 2019-09-07

Document ID: EDOC1100011877

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