The Basic Rate Interface (BRI) is a digital circuit-switched telephone line used to provide both voice and data services over the same line. The BRI consists of two 64 kbps bearer (or “B”) channels and one 16 kbps control or signaling (“D”) channel. The BRI is commonly used in Europe, Asia, Australia, and New Zealand for residential service as well as small business service.
In the early days of ISDN deployment in the 1980s, there were two types of access available to end users: basic rate interface (BRI), which consisted of three 64 kilobit per second channels; or primary rate interface (PRI), which was a single 1.544 megabit per second channel using T1 lines in North America or E1 lines elsewhere. PRI was initially deployed by large organizations such as corporations who needed higher bandwidth than what BRI could offer at that time.
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