This may be silly questions but here goes...
What is the difference between connecting to an ISP using a dial-up modem and a DSL modem...
Dial-up (as I understand it):
*Modem at my house makes a call to a modem located at an ISP premises.
*A data link is established between the two modems.
*Data is encoded and sent over a 'normal' voice connection.
DSL (as I understand it):
*Connection is always 'on'.
*Connection is a data link connection (PPP) between my modem and the ISP premises?
*Does the DSLAM act as bridge?
*How does the DSLAM know which ISP to connect to (manually configured, or configured via my modem)?
*How is the ISP end addressed, as a phone number, like with dial-up?
Part 2, so what happens in an unbundled exchange...