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Overview of PON Interfaces
Passive optical network (PON) technology is a new point-to-multipoint optical access technology. A PON network uses only optical fibers to transmit data, voice, and video services.
A PON network consists of only passive optical components. This technology has the following advantages:
- Prevents electromagnetic interference and lightning damages generated by active electronic components.
- Reduces failure rate of lines and devices.
- Simplifies power supply configuration and network topology.
- Improves system reliability.
- Saves maintenance costs.
Theoretically, a PON network can transmit signals of any format at any rate.
PON System Architecture
As shown in Figure 21-1, a PON system consists of optical line terminal (OLT), Optical Distribution Network (ODN), and optical network units (ONUs).
An OLT is an aggregation device that terminates PON protocol packets on a carrier network.
An ODN is a passive device that connects ONUs to an OLT. It distributes data to downstream ONUs and aggregates data sent to the upstream OLT.
An ONU is a user-side device that provides interfaces for users.
The router functions as an ONU.
