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ADSL vs cable vs NBN: What’s the difference?
The main difference between older ADSL and cable connections with the NBN is speed. You'll get speeds up to to 4 times faster with the NBN.
With the NBN officially rolled out across Australia since December 2020, older ADSL and cable technologies have been phased out. But how does the NBN compare to the older ways of connecting to the Internet?
The NBN is capable of faster speeds, but that's not all that differs. We'll cover the different features including modems, setup and more.
ADSL, cable and the NBN are all ways to get connected to the Internet, with the NBN replacing the other two, older technologies. Of all three, the NBN should be the fastest, but how do they all compare?
What's the difference between ADSL and NBN?
The main difference between these two connections is how much copper they use, which affects their speed.
ADSL uses copper telephone cables, which quickly loses signal strength over distance. That means the further you are from your local telephone exchange, the slower it gets – if you're more than two or three kilometres away, your speed will be significantly impacted. Unfortunately, most people live too far away from their local exchange to get decent ADSL speeds, which is why ADSL has a reputation for being slow.
The NBN instead uses mostly fibre optic cables, which don't have this same loss in speed with exchange distance. Fibre optic cables handle speed a lot better. Even though many NBN connection types do include some copper, most notably Fibre to the Node (FTTN), there is much less copper involved compared to ADSL, making NBN faster and more reliable overall.
Is NBN faster than ADSL?
In almost every case NBN is faster than ADSL. Here's a table of ADSL's and NBN's maximum and typical speeds (the average speed when everyone is online, as reported by industry watchdog ACCC).
|Connection type/NBN tier||Typical download speed||Maximum download speed||Maximum upload speed|
NBN fixed wireless vs ADSL
NBN fixed wireless is a lot less reliable than a fixed-line connection. Fixed wireless NBN uses radio signals transmitted to an outdoor antenna connected to your house to get you connected to the Internet. Since there are no fibre optic cables connecting you to the closest fixed wireless NBN tower, these signals are a lot more vulnerable to interference that can cause slower speeds.
NBN fixed wireless is technically capable of speeds in excess of NBN 50. This means, overall, you'd expect fixed wireless to outperform ADSL the majority of the time. However, during busy periods (7-11pm), fixed wireless connections can plummet to just 6Mbps, which is actually slower than your average ADSL connection.
Are NBN modems different to ADSL?
They can be a little bit different, especially as ADSL modems tend to be older models. Here's what your modem may need to connect to the NBN:
- Ethernet WAN port. This is usually yellow and will be labelled "WAN" or "Internet" on the back. If your ADSL modem has this, it should work with Fibre to the Premises, Hybrid Fibre Coaxial, Fibre to the Curb, Fixed Wireless or Satellite NBN services.
- DSL port. DSL ports are usually grey or blue and will be labelled "Line" or "DSL". Even if your modem has a DSL port, you'll need to make sure that the modem is VDSL2 compatible by checking it with the manufacturer or your Internet provider. Fibre to the Building and Fibre to the Node services need this.
What's the difference between cable and the NBN?
The coaxial cable used in cable broadband is actually fairly similar to the NBN's fibre optics, although it can't achieve anywhere near the same upload speeds (2Mbps compared to the NBN's 40+Mbps). In fact, many of these older coaxial cables have been integrated into the NBN and make up part of its Hybrid Fibre Coaxial (HFC) connections.
Since cable Internet doesn't use any copper wires, it doesn't fall off as sharply with distance to the exchange as ADSL does. In terms of performance, it sits somewhere in between ADSL and most NBN connections.
Compare NBN plans
Ready for the NBN? With most homes in Australia switching to the NBN, compare your plan options below. You can pop your address into the space below and we'll show you NBN plans available in your area.
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Frequently asked questions
Is NBN VDSL or ADSL?
Will the NBN replace ADSL?
Can I use my ADSL modem for the NBN?
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