Which ISDN configuration is primarily used for home or small business connections?

ISDN BRI, or Basic Rate Interface, is designed specifically for smaller scale applications such as home or small business connections. It offers two 64 Kbps B channels for data and one 16 Kbps D channel for control signaling, making it ideal for typical residential and small business telecommunications needs. This configuration allows for simultaneous voice and data services, accommodating the common usage patterns found in these environments.

In contrast, ISDN PRI (Primary Rate Interface) is more suited for larger organizations, providing a higher capacity with 23 B channels and one D channel in North America or 30 B channels and one D channel in Europe. ISDN HDLC refers to the High-Level Data Link Control protocol used for framing data, and ISDN Q.931 is a signaling protocol that governs how the channels are established but does not define a configuration for service delivery itself. Thus, BRI stands out as the appropriate choice for smaller setups requiring straightforward, cost-effective connectivity.