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Published On: 5th Aug 2026 07:00
ISDN stands for Integrated Services Digital Network and it is a digital network providing 64 Kbit and 2 Mbit bandwidth voice and data circuits. A set of international standards for telephone transmission.
ISDN provides an end-to-end digital network, out-of-band signalling, and greater bandwidth than older telephone services.
The two standard levels of ISDN are Basic Rate Interface (BRI) and Primary Rate Interface (PRI). See Basic Rate Interface and Primary Rate Interface.
Reviewed by: Megan Jones
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