| Word | Description |
| Gateway | A computer that is connected between two networks and acts as an information transfer point. |
| Gateway site | A centralised location – typically a small building located within the development estate – from which all premises in the estate can be accessed via the communications infrastructure. |
| gbps | Gigabits (or thousands of millions of bits) per second – a measure of communications speed. Links that operate at 1gbps or higher are typically only used today for carrying the aggregated traffic of many individual users. |
| GPON | Gigabit PON. See PON. |
| Groupware | Software that provides collaboration and communication over the web, or across an organisations network. |
| GUI (graphical user interface) | The user’s interface that consists of icons, buttons etc, which allows them to interact with a computer. |