and I don't understand your question.
A dial up connection is completely different from a Broadband connection. A dial up connection can be made on any ordinary telephone line.
A Broadband connection must be enabled first (by BT or your ISP) , so that there is a broadband signal coming down your telephone line. Basically they are different types of signal coming down and up your telephone line.
Are you talking about a satellite broadband connection, where the download signal comes from the satellite and the upload signal goes up the phone line?