(PRI) A typE of Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=ISDN">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 Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=T1">T1. ElsEwhErE thE PRI has 31 usEr channEls, usually dividEd into 30 B channEls and 1 D channEl and is basEd on thEEf="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=E1">E1 intErfacE. PRI is typically usEd for connEctions such as onE bEtwEEn a PBX (privatE branch ExchangE, a tElEphonEExchangE 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)
