ISDN – Integrated Services Digital Network

(ISDN) Integrated Services Digital Network- is a circuit-switched telephone network system designed to allow digital transmission of voice and data over ordinary telephone copper wires, resulting in better voice quality than an analog phone. It offers circuit-switched connections (for either voice or data) and packet-switched connections for data in increments of 64 kb. The two standard levels of ISDN are the (BRI) Basic Rate Interface and the (PRI) Primary Rate Interface .

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