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How fast should your broadband internet be and what can slow it down

by Community Manager on ‎08-05-2017 11:33 PM

Broadband speed is largely determined by the network access type (ADSL, Cable, nbn™ etc.) so not everyone’s speed will be the same and you won’t always get the same speed all the time.

ADSL Up to 8Mbps Up to 1Mbps
ADSL2+ Up to 20Mbps Up to 1Mbps
Cable (base plan) Up to 30Mbps Up to 1Mbps
Cable (speed boost) Up to 100Mbps Up to 2Mbps
nbn™ Fixed Line (base plan) Up to 25Mbps Up to 5Mbps
nbn™ Fixed Line (super speed boost) Up to 100Mbps Up to 40Mbps
nbn™ Fixed Line Wireless Up to 25Mbps Up to 5Mbps


Test your speed


What slows internet speeds down

In the home:

Wi-Fi signal

The strength of your Wi-Fi signal impacts the speed of your internet.

Things that can affect the Wi-Fi signal include:

  • Physical barriers – like metal, wood, concrete walls or water
  • Interference from other electronic devices - microwaves, cordless phones and baby monitors can all affect Wi-Fi signal
  • The distance, and number of physical barriers, between the device and the Gateway or modem

Try to place your Gateway or modem in an area that avoids most metal (ductwork), floors, and walls as possible. There may be specific spots in your home or workplace where Wi-Fi won’t reach, no matter where your Gateway or modem is situated.

The quality of the Wi-Fi component in the Gateway or modem will also have an impact on how far the Wi-Fi signal can reach. Our T-Gateways all have very good Wi-Fi capability with the Gateway Max modem having the best.

You can easily check to see if your Wi-Fi signal is getting interference from other electronics by testing your internet speeds close to your modem. If the speeds or signal drop off as you move your device further away, without going through any physical barriers, it’s likely that interference from another device is the cause.

Viruses and out of date equipment

Malware or viruses can cause your internet to seem sluggish. You can help prevent malware from infecting your devices with Telstra Broadband Protect.

Certain older computers and devices may not be able to support the maximum speeds of your internet connection. This can be easily identified by testing speeds on a newer device on the same connection.

Multiple devices sharing bandwidth

In the past, broadband connection was typically connected to a single computer within the home. Today with multiple devices connecting to the internet at the same time this bandwidth needs to be shared which slows down the connection especially as it’s not always shared evenly across all devices.

You can check if other devices are causing your slow speed by turning your Wi-Fi off and back on, then connecting one device at a time.


Outside of the home:

Network Congestion

Network congestion occurs when a network doesn’t have enough capacity to handle the amount of data customers are trying to access. It usually occurs during peak periods (5pm-11pm) when customers are at home but can also occur at other times, especially when special broadcast events are on like the Olympics, or when iPhone software updates are released, or during school holidays.

If you’re experiencing consistently slow speeds all the time it means something other than network congestion may be the issue.

Distance from exchange

Customers’ ADSL services are connected to telephone exchanges. These buildings provide thousands of voice and internet connections across many suburbs. From these exchanges, copper lines run from the exchange all the way to a customer’s home so how far the signal has to travel from the exchange will directly affect your internet speeds.