In some cases the modem that you have been using for ADSL services will not work with NBN. NBN uses a number of different technologies to connect to each and every property around Australia. You will need to know the type of technology used before you can establish if your modem will work or if you need a new modem.
For FTTP (fibre to the premises) technology you will need a modem that is capable to connecting to a WAN network. This is quite common and a lot of modems support connecting in this way. This type of connection (WAN) is also needed for Fixed Wireless NBN. This is where NBN is delivered wirelessly to your property.
If you have FTTN (fibre to the node) or FTTB (fibre to the basement) technology then you will need a modem that is VDSL compatible. It’s often easy to establish this on the box of the modem or a quick google search of your modem make and model.
Once the above has been established you should check with your NBN provider about any VLAN Tagging requirements. A lot of NBN providers require a VLAN Tagging rule to be enabled on your router in order to connect to their network. VLAN Tagging allows the provider to prioritise voice traffic over internet traffic is they need to. This means that when VOIP calls are being made on your service the quality is not affected if someone is downloading a movie, or consuming all of your bandwidth.
Most providers will offer an option of a pre-configured modem which will have all of the required settings already set up. This is highly recommended as often the NBN providers support staff can also support their recommended modems in the most efficient ways.
When considering an NBN modem you can also look at the features of the modem. One of the latest common additional features that good modems have is AC Wifi capabilities. With AC Wifi data can be transferred across the Wifi network faster than previous Wifi versions. It’s known as 5Ghtz which is an upgrade of 2.4Ghtz Wifi. This doesn’t necessarily mean that you will receive faster internet but transferring of data on your internal network will be significantly faster. It often means that you’ll receive a greater Wifi signal so if you have a large home or business this type of Wifi would be recommended. Not all devices support AC Wifi so an AC capable modem would also have the older 2.4Ghtz frequency so that older devices can still connect.
See a full list of NBN compatible routers here