Primary Rate Interface

(redirected from Primary rate access)
Also found in: Acronyms.

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).
References in periodicals archive ?
For larger applications, the IRAS-24A offers T1 and ISDN Primary Rate access supporting up to 24 simultaneous calls and hundreds of remote access users.
Xircom customized its PRI-ISA-48 primary rate interface access subsystems for BellSouth Wireless to allow both basic rate and primary rate access.
The kits are available in a variety of client and server configurations supporting both Basic Rate and Primary Rate access.