Stands for "Optical Network Terminal."

An ONT is a peripheral device that provides a physical bridge between a fiber optic Internet connection and a local network. Much like a cable modem converts a digital signal into one that can travel over coax, an ONT converts the electrical signal of a local Ethernet network into an optical signal that travels over fiber optic lines. Once connected to a router, it provides a constant high-speed broadband Internet connection.

An ONT has several ports on the back. It will take an incoming fiber optic cable that must be installed by a technician, due to the fragile nature of the glass inside the cable. It also has at least one RJ45 Ethernet port to connect the ONT to a router. Some ONTs also include one or more RJ11 telephone jacks to support VoIP service through the ISP.

The back of an ONT, connected to Ethernet, fiber, and power
The back of an ONT, connected to Ethernet, fiber, and power

Fiber Internet connections are one of the fastest types available, offering standard speeds up to 1 Gbps and up to 2 Gbps in certain areas. Unlike cable Internet, which offers fast download speeds but limited upload speeds, fiber Internet speeds are symmetrical; if you can download at 1 Gbps, you can upload at 1 Gbps. It is also uncommon for fiber ISPs to impose monthly data caps on their customers.

NOTE: Unlike modems, which can be purchased separately and installed by the customer on their own, an ONT is considered property of the ISP and needs to be installed by a technician.

Updated September 29, 2022 by Brian P.
Reviewed by Per C.

quizTest Your Knowledge

Which computer component includes built-in VRAM?

Network adapter
M.2 solid-state drive
USB controller card
Graphics card
Correct! Incorrect!     View the VRAM definition.
More Quizzes →

The Tech Terms Computer Dictionary

The definition of ONT on this page is an original definition written by the TechTerms.com team. If you would like to reference this page or cite this definition, please use the green citation links above.

The goal of TechTerms.com is to explain computer terminology in a way that is easy to understand. We strive for simplicity and accuracy with every definition we publish. If you have feedback about this definition or would like to suggest a new technical term, please contact us.

Sign up for the free TechTerms Newsletter

How often would you like to receive an email?

You can unsubscribe or change your frequency setting at any time using the links available in each email.

Questions? Please contact us.