What is the basic difference between ISDN and ADSN connection?

Answer 1

With ISDN you can implement ASDN. ISDN is a way of transmitting digital signals on a network - fiber or analog copper. It allows "virtual circuits" to be configured and bandwidth reduced or raised as needed. This is controlled by signalling messages that goes on a dedicated part of the lines.

ASDN is a way of coding signals on a copper wire - where the signals can be ISDN lines.

ISDN is the core network technology in the GSM mobile network, which allows this to set up phone connections, and keep these connected as you call while you move around.