ISDN stands for Integrated Services Digital Network. ISDN allows the use of digital information all the way through the connection from origin to destination.
Digital information is clearer and more distinct, resulting in almost error free communication.
Sierra Telephone provides ISDN service for both business and home. A current modem may be able to move information at 33.6 kilobits per second. An ISDN line can move information at 128 kilobits per second, or about four times as fast. There is also a D channel that carries information about the type of call being made. ISDN is also ideal for video conferencing since it can move a great deal of data very quickly.