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BRI stands for Basic Rate Interface, which is a term used in ISDN (Integrated Services Digital Network) communication. It is defined as a type of service that provides two B channels for data transmission, each with a bandwidth of 64 Kbps, along with one D channel for signaling, typically at 16 Kbps. This configuration enables simultaneous voice and data transmission over the same line, making it suitable for small businesses and residential users requiring reliable telecommunication services.

The significance of BRI lies in its ability to provide lower-level access to ISDN compared to PRI (Primary Rate Interface), which offers more channels and is intended for larger businesses with greater communication needs. In functioning networks, BRI is often employed for applications that require both voice and data integration, such as video conferencing and remote access solutions.

Understanding BRI is crucial for networking professionals dealing with telecommunications, as it illustrates a foundational aspect of digital communication protocols that can impact network design and implementation strategies.