PRI Last modified: Wednesday, October 16, 2002
Short for Primary-Rate Interface, a type of ISDN service designed for larger organizations. PRI includes 23 B-channels (30 in Europe) and one D-Channel. In contrast, BRI (Basic-Rate Interface), which is designed for individuals and small businesses, contains just two B-channels and one D-channel. PRI service is generally transmitted through a T-1 line (or an E1 line in Europe).
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