Question
Download Solution PDFWhich of the following are ISDN interfaces?
A. Asymmetric DSL Interface (ADSLI)
B. Basic Rate Interface (BRI)
C. Ultra-Advanced Rate Interface (UARI)
D. Primary Rate Interface (PRI)
E. Broadband-ISDN (B-ISDN) & ATM
Choose the most appropriate answer from the options given below:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is B, D, and E only.
Key Points
- ISDN (Integrated Services Digital Network) is a circuit-switched telephone network system that also provides access to packet-switched networks for digital transmission of voice and data, offering better quality than analog systems.
- ISDN supports data transmission in increments of 64 kilobits per second (kbit/s) and can provide up to 128 kbit/s bandwidth in both upstream and downstream directions, achieved through channel bonding.
Types of ISDN Interfaces:
- Basic Rate Interface (BRI): Includes two 64 Kbps B channels for data and one 16 Kbps D channel for signaling. BRI provides a total bandwidth of 144 Kbps (with overhead).
- Primary Rate Interface (PRI): Offers 23 or 30 B channels (depending on the country), each 64 Kbps, and one D channel at 64 Kbps. PRI provides a bandwidth of 1.536 Mbps, with some overhead.
- Broadband ISDN (B-ISDN): Relies on fiber optics and is designed to provide higher speeds than narrowband ISDN, using advanced technology for wider bandwidth services.
ISDN Services:
- Bearer Services:
- These services transfer information (voice, data, video) between users without altering the content.
- The network simply transmits the data without processing it, falling within the first three layers of the OSI model.
- Bearer services are defined in the ISDN standard and can operate using circuit-switched, packet-switched, frame-switched, or cell-switched networks.
- Teleservices:
- These services involve the network processing or changing the content of the data.
- They correspond to OSI layers 4-7 and rely on bearer services.
- Teleservices cater to complex user needs without requiring users to understand the details.
- Examples include telephony, telefax, teletex, telex, videotex, and teleconferencing. However, these services are not yet standardized in ISDN.
- Supplementary Services:
- These services add extra functionality to bearer and teleservices, such as reverse charging, call waiting, and message handling—common in modern telephone services.
Last updated on Nov 25, 2024
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