NBN Co is testing its cheaper fibre-to-the-curb (FTTC) technology.

FTTC is a less costly alternative to fibre-to-the-premises (FTTP) connections, as it does not require as many trenches to be dug, and cheaper that fibre-to-the-node (FTTN) because it does not need mains power on street corners.

The first driveway connection under FTTC has been activated at Coburg in Melbourne's northern suburbs.

“We believe FTTC will become another vital tool in the mix of technologies we're using to deliver the NBN,” NBN Co chief Bill Morrow said.

“Our huge country makes deploying the NBN extraordinarily complex, so having flexibility in terms of the technology we deploy in the field is incredibly important.”

NBN Co says having fibre technology run only to the driveway or property boundary via FTTC would cut costs and save time.

The company says a FTTC connection will cost $2,900 per premises, compared to $4,400 for FTTP.

Mr Morrow has once again had to defend the rollout and the mix of technology mandated by the Turnbull Government when it took office.

“Of course, I understand why some people come out with glib catchphrases like, 'Do it once, do it right, do it by fibre',” Mr Morrow said.

“If only it were as simple as that in the real world.”

The nationwide network continues to be criticised for its costs, technological mix, slow connections and other issues.