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Isdn

ISDN
INTEGRATED SERVICES DIGITAL NETWORK
Shaikh Sameer & Aparna Arora
II Year Engineering In Information Technology
SHAH & ANCHOR KUTCHHI ENGG. COLLEGE,
Mahavir Education Trust's Chowk,
W.T. Patil Marg, Chembur.
Mumbai – 400088.

Email : luv2sam786@yahoo.co.in , heartthrob_aps_86@yahoo.co.in



Figure 12-1 Sample ISDN Configuration Illustrates Relationships Between Devices and Reference Points



ISDN applications

TABLE OF CONTENTS
1. INTRODUCTION
2. HISTORY OF ISDN
3. INTERFACES
4. ISDN LAYERS
5. ISDN INFORMATION ELEMENTS
6. ISDN REFERENCE POINTS
7. APPLICATIONS OF ISDN
8. ADVANTAGES
9. DISADVANTAGES
10. CONCLUSION
11. REFERENCES

ABSTRACT

This paper presents a brief overview of ISDN. The modem, a breakthrough in computer communications, allowed computers to communicate by converting their digital information into an analog signal to travel through the PSTN. There is an upper limit to the amount of information that an analog telephone line can hold. Currently, it is about 56 kb/s bidirectionally, but are limited by the quality of the analog connection and go only about 45-50 kb/s. Some phone lines do not support 56 kb/s connections at all.
ISDN which stands for INTEGRATED SERVICE DIGITAL NETWORK allows multiple digital channels to be operated simultaneously through the same regular phone wiring used for analog lines, but a digital signal, instead of an analog signal, is transmitted across the line. This scheme permits a much higher data transfer rate than analog lines.

1. INTRODUCTION

ISDN, which stands for Integrated Services Digital Network, is a system of digital phone connections which has been available for over a decade. This system allows voice, video, data and graphics to be transmitted simultaneously across the world at very high speeds using end-to-end digital connectivity over standard communication lines.
There are two basic types of ISDN...