Some providers also offer SDSL services. An SDSL connection is very similar to an ADSL connection. The difference is that ADSL can download data from the Internet faster than it can upload data, while SDSL is just as fast at uploading as downloading.
But since SDSL requires an extra telephone line, separate from the one you use for voice calls, SDSL is not a popular option for the home user. SDSL is really just a specialist option for some businesses that need to send large amounts of data.
