ISDN (Integrated Services Digital Network) is a set of communication standards that allows the simultaneous transmission of voice, video, and data over digital lines. It is a technology used for digital phone lines, offering higher quality and capacity compared to analog telephone lines. ISDN provides an end-to-end digital connection between two points, allowing faster transmission speeds and improved reliability.
ISDN is characterized by its ability to support multiple digital channels known as B-channels. These channels can be used for voice, data, or video transmission, providing users with faster communication and increased bandwidth. In addition to B-channels, ISDN includes a D-channel, a signaling channel that handles call setup, teardown, and other control signals.
ISDN offers various services, including Basic Rate Interface (BRI) and Primary Rate Interface (PRI) which are commonly used in different countries. BRI consists of two B-channels and one D-channel, while PRI provides 23 or 30 B-channels along with one or two D-channels, respectively.
ISDN has been widely utilized in business environments due to its ability to support various applications and services, such as video conferencing, high-speed internet access, and digital data transmission. However, with the development of newer technologies like broadband internet, ISDN usage has been on the decline in favor of more advanced alternatives.
