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)
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.
- PRI (abbreviation)
- basic rate interface, BRI
- integrated services digital network, ISDN
- non-facility associated Ssgnalling, NFAS