What model ONT is currently being used with tripple play gigabit installations?
That is totally dependent on the installer and what ont he has with him.
when I had mine installed it was one of the older Alcatel models. It does handle Gigabyte speeds.
it is one of those big old grey ones.
your model may vary. Often times dependent on if an inside install or an outside install. If a space saver or one that will be used in a basement or garage.