ADSL is a type of Broadband (high speed) Internet connection. ADSL is an acronym which stands for Asymmetric Digital Subscriber Line.
The service makes use of your existing BT telephone line, but splits the signal into two, one for voice communications and the other for the high speed Internet connection. It achieves this by making use of a frequency range not used in normal voice communications. The splitting of the line allows Internet access, and fax/phone at the same time. The ADSL part of the line is permanently connected to the internet with no call charges. Any voice or fax calls are charged by BT per normal.
If your telephone exchange and line have been upgraded to BT’s new 21st century Network system (21CN) then you may achieve ADSL2+ speeds of upto 24Mbps maximum download. Standard 20CN BT exchanges will achieve upto 8Mbps maximum download speed. Speeds reduce as the length of the line increases.
To establish a rough estimate of the speed you are likely to receive for your telephone line, start the order process and enter your telephone number. The availability checker will provide you with BT’s estimate of download speed based upon the length of your line, and exchange capability. Actual speeds in service can vary from the estimate, but we will provide the best available speed on your line. Other factors such as network usage and contention can also vary throughput speed in service.