Quick answer: Unless you live in a unit, new development or rural area, you’re likely to get Fibre-To-The-Node (FTTN). This technology will form the largest part of the nbn™. Fibre optic cable runs to a local node (connection cabinet) in a street in your area and then connects to the existing copper phone lines to your place. The connection cabinet handles connections for up to 1000 premises.
The node system uses VDSL (vectored or enhanced DSL) technology that improves ADSL connections on existing copper phone lines. VDSL is able to cancel the interference, or crosstalk, between the copper lines from the telephone exchange in order to speed up the transfer rate of internet traffic. While FTTN or VDSL can achieve speeds of up to 100 Mbps, like ADSL the further your home is away from the cabinet the slower your speed may be on the nbn™.
You’ll need a new VDSL modem, but no new hardware needs to be installed in the home. Your existing home phone line should plug into the VDSL modem, which is connected to the existing phone port inside your house.