Unlike cable modems, which are widely available at retail, .

While rare for residential users, some niche scenarios or specific "open access" fiber networks might allow third-party ONTs. If you are in a position to purchase one, focus on these performance standards: What is an optical network terminal (ONT)?

: The ONT acts as the "handshake" with the provider's central network; most ISPs require their own specific hardware for security and network authentication.

: Because they are considered part of the network entry point, many providers like Google Fiber do not charge extra equipment fees for the ONT. When Buying Makes Sense

Buying an is fundamentally different from buying a traditional cable modem. While a modem translates electrical signals over copper, an ONT converts light signals from fiber-optic cables into the digital data used by your home devices. Can You Buy Your Own ONT?