BRI (Basic Rate Interface) is one of the types of ISDN (Integrated Services Digital Network) services. It provides two 64 kbit/s B channels and one 16 kbit/s D channel, often referred to as 2B+D. These channels allow simultaneous transmission of voice, video and data over the same line.


Although both BRI and PRI (Primary Rate Interface) are ISDN services, they have differences.

Bandwidth. BRI provides 2B+D channels, making it suitable for small business or home use. In contrast, PRI provides 23B+D channels in North America (and 30B+D in Europe), targeting large enterprises.

Infrastructure. BRI can be deployed over existing telephone lines, while PRI often requires specialized infrastructure.

Cost. Given the bandwidth, BRI is generally more affordable than PRI, making it the preferred choice for small systems.

Advantages of BRI

Versatility. The BRI’s ability to simultaneously transmit voice, video and data makes it a universal means of communication.

Reliability. BRI provides a stable and reliable digital connection, ensuring clear and stable communication.

Cost-effectiveness. For small businesses and individual users, BRI is a cost-effective solution that allows the use of existing telephone lines.

BRI Application Areas

Teleconferences: The ability to simultaneously transmit voice and video makes BRI an ideal solution for teleconferences.

High-speed Internet connection. Before the widespread adoption of broadband networks, BRI was a popular choice for high-speed Internet access.

Fax and data transfer services. BRI has been used for reliable fax and data transmission, especially in business circles.

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