IGNOU MLI 4 2026 - What is ISDN? Describe its various devices.

Question

What is ISDN? Describe its various devices.

09 Jan 2026

Answer :

Word Count : 483

Integrated Services Digital Network (ISDN) is a set of international standards developed to provide end-to-end digital communication over the traditional public switched telephone network. Unlike the earlier analog telephone system, ISDN enables the transmission of voice, data, video, and other services simultaneously over the same line using digital signals. It was designed to improve the quality, speed, and reliability of communication by integrating multiple services into a single network infrastructure. ISDN uses circuit-switched connections, ensuring a dedicated path for the duration of a call, which results in consistent performance and predictable quality of service. ISDN operates mainly in two standard forms: Basic Rate Interface and Primary Rate Interface. To support these services, several specialized devices are used to connect user equipment with the ISDN network. One of the primary devices is Terminal Equipment. Terminal Equipment is classified into two types: TE1 and TE2. TE1 refers to devices that are natively compatible with ISDN standards, such as ISDN telephones, ISDN fax machines, and video conferencing

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