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Isdn99
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Isdn99

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  • 1. 1
  • 2. contents •INTRODUCTION •ISDN PROTOCOLS •ISDN AND OSI MODEL •FUNDAMENTALS •ADVANTAGES OF ISDN •INTERFACE AND DEVICES •NARROWBAND ISDN •BROADBAND ISDN •MODES OF USAGE •ISDN ROUTER •ISDN EQUIPMENT •CONCLUSION 2
  • 3. WHAT IS ISDN? It is a set of protocols that combines digital telephony and data transport services. The whole idea is to digitize the telephone network to permit the transmission of audio, video and text over existing telephone line. 3
  • 4. Why ISDN? q ISDN - Integrated Services Digital Network q Telephone services -> Telecommunication services q Used for voice, image and data 4
  • 5. ISDN protocols  E - series for Telephone network and ISDN  I - series for ISDN concepts, aspects and interfaces 5
  • 6. ISDN and OSI model  Layer 1 - Physical  Layer 2 - Data Link  Layer 3 - Network 6
  • 7. Fundamentals  Types of channels • Bearer channel (B-channel=64 kb/s) clear pipe for data • Delta channel (D-channel, 16 kb/s or 64 kb/s) call signaling information:  who is calling  type of call  calling what number 7
  • 8. Fundamentals  Service types • Basic Rate Interface (2 B channels + 1 D channel (16 kb/s)) • Primary Rate Interface (30 B channels + 1 D channel (64 kb/s)) 8
  • 9. Advantages of ISDN  Digital • reliable connection  Speed • 128 kb/s (160 kb/s) for BRI • 1920 kb/s (2048 kb/s) for PRI  Fast call setup • 2 seconds 9
  • 10. Advantages of ISDN (2)  Bandwidth on Demand • adding new channels to the bundle of channels  Multiple devices • phone, fax, PC, videoconferencing system, router, terminal adapter,.. each with its own sub-address 10
  • 11. Interfaces and Devices ISDN devices TE1 4W 2W NT1 S/T interface U interface TE2 TA Analog devices: Rate adaptation phone, Fax III,... 11
  • 12. Interfaces and Devices  Interfaces • S/T (4w) • U (2w)  Devices • NT1 • TE1 - ISDN devices • TE2 - analog devices (need TA) • TA - Terminal Adapter (rate adaptation (V.110, V.120) 12
  • 13. NARROWBAND ISDN (N- ISDN) The original ISDN providing data rates of 64 kbps to1.544 mbps is known as narrowband ISDN. When ISDN was originally designed, this range of data rate was sufficient to handle all existing transmission needs. As applications using the telecommunication network advanced, these rates proved inadequate to support many applications. 13
  • 14. BROADBAND ISDN To provide for the needs of the next generation technology, an extension of ISDN, called broadband ISDN (B-ISDN). B-ISDN provides subscribers to the network with the data rates in the range of 600 mbps, almost 400 times faster than the PRI rate. Technology exists to support higher rates but is not yet implemented or standardized. B-ISDN is based on a change from metal cable to fiber- optic cable at all levels of telecommunication. 14
  • 15. B-ISDN SERVICES 1. Interactive services 2. Distributive services 15
  • 16. 1.INTERACTIVE SERVICES  Conversational  Messaging  Retrieval 16
  • 17. 2.DISTRIBUTIVE SERVICES  without user control  with user control 17
  • 18. Physical Specification of Broadband ISDN  Access method  Functional grouping  Reference points 18
  • 19. Dial Up  Providers need: • subscribe for PRI connections or multiple BRI connections • ISDN Access Server 19
  • 20. Dial Up - Private Internet ISDN Access server ISDN connection Telephone Network PC with internal or external ISDN adapter ISDN connection 20
  • 21. Dial Up - LAN Internet ISDN Access Server LAN ISDN connection Telephone Network ISDN connection ISDN router 21
  • 22. ISDN ROUTERS  Integrated NT:- It is a device which forms a boundary to the network and may be controlled by the provider of the ISDN services.  Integrated Modem:- The term modem is composite word refers to the two functional entities that make up the device, a signal modulator & demodulator.  PPP:- The telephone line provides a physical link, but to control and manage the transfer of data, there is a need for a point-to-point link protocol. 22
  • 23. ISDN EQUIPMENTS  Normal ISDN Phone.  Advanced ISDN Phone.  Video Phone:- This is a subset of video conferencing equipment. 23
  • 24. BANDWIDTH ON DEMAND A digital service that allows subscribers higher speeds through the use of multiple lines. 24
  • 25. ISDN Vs Analog Telephone Line  Analog:- Voice data, one call possible at one time. Vs  ISDN:- multimedia data, voice data, image graphics, can connect a pair of telephone over existing telephone line. 25
  • 26. Conclusion  ISDN is an effort to standardize subscriber services, provide user/network interfaces, and facilitate the internetworking capabilities of existing voice and data networks.  The goal of ISDN is to form wide area network that provides universal end-to- end connectivity over digital media.  ISDN can brought to a subscriber premise with minimum cost and the services available can satisfy the need of many users.  The protocol is flexible enough to be upgraded to higher data rates using new technology and new transmission media. 26
  • 27. REFERENCES  DCN BY B.A. FOROUZAN  WIKIPEDIA.COM  ANSWERS.COM 27
  • 28. THANK YOU 28

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