FTTH: Discover the Characteristics of This Ultimate Technology


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16 July 2021

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Fiber to the Home or simply FTTH is a technology that directly uses optical fiber from the central point to the residential base. It provides constant high-speed internet service. Here, “H” includes both home and small business. FTTH is the ultimate fiber access solution where every subscriber is connected to an optical fiber. The deployment options are based on a complete optical fiber path from the Optical Line Termination (OLT) right to the subscriber premises.

This option supports high bandwidth services and content to each client and ensures maximum bandwidth for future demands of new services. Hence, Hybrid options including ‘part’ fiber and ‘part’ copper infrastructure systems are not included. An optical fiber network can be used in two ways: An active optical network and a Passive optical network. The prevailing mass FTTH deployment is based on the passive method. Therefore, let’s understand the Passive Method in detail.

Passive Optical Networks

The vital interface points of PON are in the central office equipment, known as the OLT for optical line terminal and the ONU for optical network unit, and ONT for optical network terminal. Regardless of terminology, the important difference between OLT and ONT devices is their function. OLT devices support management functions and maintain a maximum of up to 128 downstream links. In practice, it is common for only 8 to 32 ports to be linked to a single OLT in the central office; conversely, the ONT devices in the CPE support only their link to the primary office. Consequently, the ONT/ONU devices are much more expensive, while the OLTs tend to be more costly and capable.


The OLT remains in the central office (CO). The OLT system gives aggregation and switching functionality between the core network (multiple network interfaces) and PON interfaces. The network of the OLT is typically related to the IP network and the backbone of the network operator. Various services are given to the access network through the interface.


The access node installed within user premises for network termination is known as ONT. This gives access to the users, i.e., an External plant/ customers bases equipment providing a user interface for many/single customers. Whereas access nodes installed at the other locations, i.e. curb/cabinet/building, are termed ONU. The ONU/ONT provides user interfaces (UNI) towards the customers and uplink interfaces to uplink local traffic towards OLT.


Fiber offers several advantages over the previous technologies. The most important ones are as follows −

Enormous information-carrying capacity

Easy to install

Easily upgradeable

Reduces operations and maintenance costs

Allows fully symmetric services

Strong, flexible, and reliable

Covers very long distances

Immune to electromagnetic interference (EMI)

Allows small diameter and lightweight cables

Lower cost

Safe and secure


Home fiber (FTTH), also called “facility fiber” (FTTP), is the installation and use of optical fiber from a focal point directly to specific buildings, such as homes, apartment buildings, and businesses, to provide unprecedented high speed. FTTH dramatically improves the connection speeds available to computer users compared to the technologies currently used in most areas.

Some communities currently enjoy the FTTC “fiber on the curb” service, which refers to installing and using fiber optic cables on the curbs near businesses or homes, with a “copper” medium transmitting signals between the curb and the curb end users.

Read More: https://cdatatec.com/

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