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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).

Related Categories

ISDN
Related Terms

B-channel

BRI

ISDN

T-1 carrier
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