| 释义 |
Primary Rate Interface
Primary Rate Interface(PRI) A type of ISDN connection. In North America andJapan, this consists of 24 channels, usually divided into 23 Bchannels and 1 D channel, and runs over the same physicalinterface as T1. Elsewhere the PRI has 31 user channels,usually divided into 30 B channels and 1 D channel and isbased on the E1 interface.
PRI is typically used for connections such as one between aPBX (private branch exchange, a telephone exchange operated bythe customer of a telephone company) and a CO (central office,of the telephone company) or IXC (inter exchange carrier, along distance telephone company).FinancialSeet1/pri |