ADSL is only available in certain areas because you have to live within four miles of a properly equipped central office of the telephone company. However, uploading is as slow as a conventional modem. This is not a problem if you are just surfing the Web, but it is a problem when you are sending pictures or audio over the Internet. Another problem with cable modems is that bandwidth is shared with other users on the same line. As more of your neighbors sign up for cable modem service, the slower it will become.
Frame relay is a dedicated leased line.
You pay a flat rate for the service. Bandwidth can range from 64 Kbps up to a full T1, which is 1.5 Mbps. Frame relay is mostly for business. It is fast, highly reliable, and very cost effective for large transfers of data. Satellite will allow a download speed of about 400 Kbps.