primary rate interface
- (telecommunications) an ISDN service delivered over T1, E1 or J1 datalines, with delivery of connections between 1472 kilobits per second and 1984 kilobits per second (kibibits)
- PRI (abbreviation)
- basic rate interface, BRI
- integrated services digital network, ISDN
- non-facility associated Ssgnalling, NFAS
In North America, PRI is delivered via T1 lines using DS-1 signalling (1536 kbs capacity), with 23 B-channels and 1 D-channel, all of 64kbps, giving a payload rate of 1536 kbps and a service rate of 1472 kbps.
In Japan, PRI is delivered via J1 lines, with the same characteristics as North American lines.