What is the main purpose of an Integrated Services Digital Network (ISDN)?

The main purpose of an Integrated Services Digital Network (ISDN) is to enable voice, video, or data transmission over digital lines. ISDN provides a set of communication standards that allow multiple types of data to be transmitted simultaneously over standard phone lines, which is a significant advancement over traditional analog systems. This capability means it can effectively support various services—such as telephone calls, video conferencing, and internet access—through a single digital connection.

By facilitating seamless communication between different types of media, ISDN serves as a bridge in the telephone and data networks, ensuring efficient and high-quality transfers. This integrated approach enhances the overall utility of telecommunications, making ISDN a crucial technology for both individual consumers and businesses seeking to improve their communication capabilities.

The other options do not accurately represent the primary function of ISDN. Wireless internet connections are typically handled by different technologies, and while ISDN can improve certain connection aspects, it is not primarily designed for increasing internet speed. Connecting computers via local area networks is a separate function and generally does not involve ISDN technology directly, as local area networks usually rely on Ethernet or Wi-Fi protocols for communication.