English

Noun

primary rate interface ‎(plural primary rate interfaces)

1. (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)

Synonyms

• PRI (abbreviation)

Coordinate terms

• basic rate interface , BRI
• integrated services digital network , ISDN
• non-facility associated Ssgnalling, NFAS

Usage notes

In Europe, the PRI is delivered via E1 lines (2048 kb/s capacity), with 30 B-channels and 1 D-channel, all of 64kb/s, giving a payload rate of 1984 kb/s and a service rate of 1920 kb/s.

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.

Translations