Basic Knowledge About OLT

As telecommunications network technologies become more advanced and mature, fiber to the home (FTTH) networks are beginning to replace existing copper cable infrastructure, such as telephone lines and coaxial cables. Generally, FTTH broadband connections consist of two types of systems, called Active Optical Network (AON) and Passive Optical Network (PON). And most FTTH deployments tend to use PON because of its low cost and high performance. As one of the indispensable components of PON, the optical line terminal (OLT) plays a vital role in the performance of the entire network connection.

Smart Cassette 8PON EPON OLT

What is OLT?

OLT stands for Optical Line Terminal. OLT equipment is an important central office equipment. The OLT includes a central processing unit, passive optical network card, gateway router, and voice gateway upstream card. It can be connected to the front end switch through a network cable and converted into an optical signal.

The Functions of OLT

The main function of OLT is to convert the electrical signal used by the service provider equipment and the optical fiber signal used by the passive optical network (PON), and coordinate multiplexing between the end user equipment ONU (optical network unit) or ONT (optical network terminal).

By using the OLT, the standard signal used by the FIOS service provider is converted into the frequency and framing used by the PON system.

Coordinate multiplexing between conversion equipment located on the optical line terminal (OLT) at the customer’s premises

The Features of OLT

Control the flow of information upstream and downstream.

Convert the standard signal used by the fiber optic service (FIOS) to the frequency and framing used by the PON system.

The wavelength division multiplexing device is used to perform electrical/optical conversion on the serial data of the downlink frame and perform wavelength division multiplexing on it.

Multiple analog or digital signals, which are coordinated and combined into one signal (called multiplexing), occur between ONT conversion equipment.

A control device used to control the downstream frame processing device and the upstream frame processing device by using variables and timing signals from the control signal generating device.


OLT can help effectively reduce network construction costs while providing guarantees of high bandwidth and high integration. It is also an ideal and constructive solution for the FTTx project.

Baudcom offers all kinds of Optical Line Terminal (OLT). For more information, please visit

Post time:2023-07-17


Lomoveishiy – Finland

I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!

Raymond – USA

Great experience – units worked straight out of the box – just needed plug in cables and we were done. I also like the possibility to enable jumbo frames, while we do not have a need for this feature at the current moment it’s great to have this option.

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