fbpx

What is ADSL?

Once the most common internet connection in Australia, much of the ADSL infrastructure has now been replaced by the NBN.

Written by 
Savvy Editorial Team
Savvy's content writing team are professionals with a wide and diverse range of industry experience and topic knowledge. We write across a broad spectrum of finance-related topics to provide our readers with informative resources to help them learn more about a certain area or enable them to decide on which product is best for their needs with careful comparison. Meet the team behind the operation here. Visit our authors page to meet Savvy's expert writing team, committed to delivering informative and engaging content to help you make informed financial decisions.
Our authors
, updated on August 6th, 2024       

Fact checked

At Savvy, we are committed to providing accurate information. Our content undergoes a rigorous process of fact-checking before it is published. Learn more about our editorial policy.

Internet Banner - An older couple smiling at a laptop at home

Before the rollout of the National Broadband Network (NBN) across Australia, ADSL internet was the prevailing fixed line connection around the country. Although times have changed and this connection type is no longer widely available in Australia, it’s still worth understanding how it works, especially if the NBN hasn’t reached your home or office yet. You can find out all about ADSL connections right here with Savvy in our handy guide today!

What is ADSL and how does it work?

ADSL, or asymmetric digital subscriber line, is a type of internet connection which enables internet access over traditional copper telephone lines. It works by utilising different frequencies for voice and data transmission, allowing users to simultaneously make phone calls and access the internet. Here's how it works:

  • Splitting frequencies: ADSL divides the available frequencies on a copper telephone line into two bands: a lower-frequency band for voice calls (20Hz to 4kHz) and a higher-frequency band for data transmission (25kHz to 1.1MHz).
  • Asymmetric speed: ADSL is “asymmetric” because it allocates more bandwidth to downloads than uploads. This design is suitable for most home users, as they typically download more content than they upload.
  • Modems and filters: to use ADSL, you need an ADSL modem, which connects to your phone line and your computer. Microfilters are also used to separate voice and data signals so your phone and internet can operate simultaneously.
  • Signal compression: ADSL uses a technique called signal compression to maximise data transfer rates. It sends digital data in a format which takes up less space, improving efficiency.
  • Distance limitations: one key limitation of ADSL is that signal quality degrades with distance from the telephone exchange. The further you are from the exchange, the slower your connection may be.

How fast is ADSL internet?

ADSL internet speeds can vary significantly based on factors like your distance from the telephone exchange, line quality and your internet service provider's (ISP) infrastructure. In Australia, ADSL typically offers speeds up to 24Mbps for downloads and 1Mbps for uploads. However, you’re unlikely to experience maximum download speeds, with most generally only seeing up to around 10Mbps.

This means it comes with much slower maximum speeds than other, more modern forms of internet connection. For example, the slowest NBN speed tier, NBN 12, is often able to consistently deliver speeds beyond what you might expect through ADSL (12Mbps), while higher tiers can outperform it significantly. Additionally, home wireless broadband connections come with speeds from 20Mbps to 25Mbps (4G plans) into the hundreds of Mbps (5G plans).

Is ADSL internet still available in Australia?

Yes – as of September 2023, ADSL internet plans are still available in Australia. However, their availability depends on your location and whether the NBN services have been rolled out in your area. In any area where it isn’t yet available, ADSL remains an option for internet connectivity.

It's important to note, though, that over time, as the NBN continues to expand its coverage, ADSL will eventually become entirely obsolete. Once the NBN becomes available in your area, you’ll be given a set timeframe to switch before your existing ADSL internet is disconnected.

If ADSL is no longer available, there are a few options for you to choose from for your internet:

  • NBN: the most obvious alternative is ADSL’s direct replacement. NBN plans are designed to provide more reliable and faster fixed line internet to homes around Australia.
  • Fibre internet: if you’re looking for a fixed line connection but prefer to sidestep the NBN, several private companies offer their own networks of fixed line internet, known generally as fibre internet.
  • Cable internet: if you have (or had) a pay TV subscription, you may still have access to cable internet. However, like ADSL, this is being overhauled in favour of the NBN.
  • Home wireless broadband: you may wish to go the wireless route, in which case a home wireless plan may be able to deliver the internet you’re looking for.
  • Mobile broadband: though not designed for home connections, mobile broadband also utilises mobile networks to provide a source of roaming internet for on-the-go use.

To get the most up-to-date information on the availability of ADSL or the NBN in your specific location, it's worth checking with internet providers or visiting the NBN Co website to see if services have been rolled out in your area.

Helpful guides on internet plans

Internet Banner: A man in glasses sitting at a desk with a laptop

5G vs NBN

Find out the differences between 5G and NBN internet connections, including their availability, cost, reliability and more. With both 5G...

Internet Banner - Middle-aged couple sitting on the couch looking at a tablet

Alternatives to the NBN

There are several alternatives to the NBN if you’re looking elsewhere for internet for your home or office. As internet...

Internet Banner - A woman sitting at a table with a laptop and mobile phone

What is an ISP?

ISPs are a crucial piece of the puzzle when it comes to connecting your home to the internet. Internet service...

Internet Banner - Couple sitting at the table together conducting an NBN speed test on their laptop

NBN Speed Test

Test the speed for your NBN plan to find out your download and upload speeds, ping and more. Are you...

Internet Banner - Man smiling at his tablet while his partner lies on the couch behind listening to music

FTTP NBN Explained

Find out more about FTTP connections on the NBN, how they work and their potential speeds. FTTP is the most...

Internet Banner - Man sitting in an office smiling at his laptop

Types of Internet Connection

There’s a range of internet connection types to wrap your head around in Australia, from the NBN to home wireless,...

Internet Banner - Young couple sitting on the couch together looking at a tablet

What is a Mesh Network?

A mesh network could be the solution if you’re experiencing internet dead spots in your home. You might’ve heard the...

Internet Banner - Worried young man looking at his phone

Why is My Internet So Slow?

Having a slow internet connection can be painful, so it’s important to understand why that might be and how to...

Internet Banner - Woman looking at her laptop on a table in an airport

What is Mobile Broadband?

Mobile broadband is a popular connection type for those who need internet on the go. Mobile broadband is the main...

Compare internet plans with Savvy

Regardless of whether you're looking for an internet plan for a one-person household or a large family, you can compare a range of offers from leading Australian providers side by side with Savvy. Get started with a free, no-obligation quote today!

Disclaimer:

Savvy is partnered with Econnex Comparison (CIMET Sales Pty Ltd, ABN 72 620 395 726) to provide readers with a variety of internet plans to compare. We do not compare all retailers in the market, or all plans offered by all retailers. Savvy earns a commission from Econnex each time a customer buys an internet plan via our website. We don’t arrange for products to be purchased directly, as all purchases are conducted via Econnex.

Any advice presented above is general in nature and doesn’t consider your personal or business objectives, needs or finances. It’s always important to consider whether advice is suitable for you before purchasing an internet plan. For further information on the variety of internet plans compared by Econnex, or how their business works, you can visit their website.

Internet Banner - An older couple smiling at a laptop at home

We'd love to chat, how can we help?

By clicking "Submit", you agree to be contacted by a Savvy Agency Owner and to receive communications from Savvy which you can unsubscribe from at any time. Read our Privacy Policy.