JT has connected 70 percent of planned premises to a new FTTH network in Jersey.
The operator has connected 24,000 of the 34,000 homes and businesses that were scheduled when it started the rollout in 2012.
It expects to connect over 37,000 properties by the time its deployment is finished - most likely this time next year – as the number of connections has increased since the deployment began.
The speed of deployment is increasing, it said, with over 8,000 premises connected in 2016.
By way of comparison, TalkTalk is connecting 7,000 premises per year on average at its FTTP network joint venture in York.
JT, which has relied on Cisco as its technology partner, is automatically upgrading existing subscribers.
It competes with rival operator Sure for new customers.
In percentage terms, JT said Jersey was ranked third in a world ranking of customers that are connected to pure fibre technology.
The UK is around the two percent mark, with BT only committing to a large-scale roll out last year.
The government committed £400 million to boost FTTH/P deployments and promised business rate relief for companies that commit to building new fibre networks in November.
JT’s Director of Corporate Affairs Daragh McDermott said: “We are really proud of the Gigabit team for what they have achieved in 2016.
“It’s been our best year yet in terms of the number of properties connected to fibre, and sets us up really well for 2017.
“In effect, we are replacing the Island’s entire broadband network, and are planning to do it more quickly than has been done anywhere else in the world - such a large and complex civil infrastructure project takes time, but once it is done, it will serve the Island well for decades to come.
“This network has put Jersey ahead of nearly every other jurisdiction in the world, most of whom are now trying to work out how they can catch-up.”