primary rate interface

1 definition found

primary rate interface - Free On-line Dictionary of Computing (26 May 2007) :

  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)