Primary Rate Interface
(PRI) A type of ISDN connection. In North America and Japan, this consists of 24
channels, usually divided into 23 B channels and 1 D channel, and runs over the
same physical interface as T1. Elsewhere the PRI has 31 user channels, usually
divided into 30 B channels and 1 D channel and is based on the E1 interface.
PRI is typically used for connections such as one between a PBX (private branch
exchange, a telephone exchange operated by the customer of a telephone company)
and a CO (central office, of the telephone company) or IXC (inter exchange
carrier, a long distance telephone company).
(1995-01-18)
Nearby terms:
Primary Domain Controller « primary key « primary
management domain « Primary Rate Interface »
Prime Computer » Primenet, Inc. » prime number
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