PRI – Primary Rate Interface
A Primary Rate Interface is a ISDN (Integrated Services Digital Network) term describing either an E1 circuit in Europe or a T1 circuit in North America. These are comprised of 30 traffic channels and two signalling channels (E1, 30B+2D – 2.048Mbps) or 23 traffic channels and one signalling channels (T1, 23B+D – 1.544Mbps) respectively.
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