Abstract The following will discuss the application and analysis ISDN (Integrated Services Digital Network) to the residential and small business user. ISDN is a digital connection of phone lines from the customer to the telephone exchange. Digital communication is able to transmit all types of communication required today. These are voice, data or computer and imaging or fax. Data communications are in high demand today and it is difficult to understand. This article will help to inform a residential or business user of the aspects of a higher speed data connection. The article will focus on Basic Rate Interface (BRI) which is the type that is most appl