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What are Passive Optical Networking PON technologies

Fiber and communications infrastructure knowledge brief Published 14 Nov 2024

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Passive Optical Networking (PON) is a fiber-optic telecommunications technology that delivers high-speed broadband from a central office to multiple end users using unpowered optical components.

Definition and Purpose

A PO

N is a point-to-multipoint fiber-optic network that uses passive optical components, such as splitters, to distribute a single optical signal from a service provider to many endpoints without requiring powered devices along the way. It was originally developed to reduce the number of fiber runs needed for residential broadband and to eliminate the need for power between the central office and end users.

PO

N is widely used for fiber-to-the-home (FTTH), enterprise LANs, and smart-building deployments.

Key Components

Optical Line Terminal (OLT): Located at the service provider's central office, it aggregates and manages data, voice, and video traffic. Optical Distribution Network (ODN): The fiber cables and passive splitters that connect the OLT to multiple end users. Optical Network Unit (ONU) / Optical Network Terminal (ONT): Located at the customer premises, these devices receive and transmit data to the OLT.

Passive Splitters: Unpowered devices that divide the optical signal from one fiber into multiple fibers to serve multiple users.

How PON Works

Downstream (OLT to ONU/ONT): The OLT broadcasts data as light signals through the fiber. Passive splitters divide the signal to reach all connected ONUs, with each ONU only accepting data addressed to it. Upstream (ONU/ONT to OLT): All ONUs share the same fiber back to the OLT.

To prevent collisions, a Time Division Multiple Access (TDMA) protocol assigns specific time slots for each ONU to transmit data.

Advantages

Cost Efficiency: Reduces the amount of fiber and central office equipment compared to point-to-point networks. Energy Savings: No powered devices are required in the distribution network, lowering energy consumption. Reliability: Passive components are less prone to failure and immune to electromagnetic interference.

Scalability: Supports multiple users from a single fiber, making it suitable for high-density residential or enterprise environments.

Types of PON

Common PO

N standards include: GPON (Gigabit PON): Supports high-speed broadband and triple-play services.

EPO

N (Ethernet PON): Uses Ethernet frames for data transmission, often in enterprise networks. In summary, PON is a highly efficient, reliable, and cost-effective fiber-optic access technology that enables service providers to deliver broadband to multiple users over a shared fiber infrastructure while minimizing power and maintenance requirements.

What are Passive Optical Networking PON technologies - CJC FIBRE CONSULTANTS [PDF]

What are Passive Optical Networking PON technologies

Passive optical network

OverviewVariantsComponents and characteristicsHistoryNetwork elementsUpstream bandwidth allocationEnabling technologiesFiber to the premises

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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