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PRI (Primary Rate Interface)

July 7, 2021 by Niall Caffrey

This term is always used in connection with ISDN as in “ISDN PRI”. It refers to a digital circuit, such as a T1 or E1 that carries multiple calls and uses the ISDN signalling protocol.

It is a type of line for large organizations, with one 64-kbit/s D channel and 23 or 30, 64-kbit/s B channels.

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