Can you explain the different broadband speeds?
When buying broadband, you'll see a number of broadband speeds, which are typically measured in megabits per second (Mbps).
Here's a quick guide to help you understand the differences.
Download speed range
Also known as the downlink or downstream speed, this is the rate that data is transmitted from BT's network to your connection.
The download speed range is the estimate we show to customers when choosing broadband deals. We also confirm this estimated speed in an email after ordering broadband with us.
Calculating this download speed range can be quite technical. First, we take the estimated speeds for the 20th and 80th percentile of customers on the same broadband package. Then we adjust that speed for congestion on the network at the business peak time between 12:00 and 14:00.
Upload speed range
Also known as the uplink or upstream speed, this is the rate that data is transmitted from your connection to BT's network.
Like the download speed range, we show an estimate for the upload speed range to customers when choosing broadband deals, and confirm this estimate in an email after ordering.
Minimum guaranteed download speed
Also known as the Minimum Guaranteed Access Line speed, or MGAL for short.
This is the minimum speed we guarantee for customers, reflecting the Ofcom Code of Practice.
The minimum guaranteed download speed is based on the download speed that the 10th percentile of customers on the same broadband will be able to achieve at the business peak time between 12:00 and 14:00.
If the minimum guaranteed download speed is not met, a customer could have the right to exit their broadband contract.
Minimum upload speed
This is the upload speed that the 10th percentile of customers on the same broadband will be able to achieve at the business peak time between 12:00 and 14:00.
This is not commonly shown, and is not guaranteed by the Ofcom Code of Practice.
Maximum download speed
This is often faster than the highest figure shown in the download speed range, as it is calculated based on performance during off-peak times.
Maximum upload speed
Like the download equivalent, the maximum upload speed reflects performance during off-peak times. This is also often faster than the highest figure shown in the upload speed range.
Advertised speeds
Also known as headline speeds, we commonly show these speeds with 'up to' in front. We use them in sales and marketing materials and on our broadband deals online. They're based on the fastest speeds the product could provide in certain conditions. Some people may actually be able to get speeds faster than we advertise. When you give us your address, we'll show the actual speeds we estimate you'll be able to achieve.
Where can I find out about BT's traffic management policy?
Traffic management can sometimes affect broadband speeds. You can view or download our broadband traffic management policy PDF to find out more.
Information on the traffic management policy [PDF, 315KB]