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Information about ISDN

Published on October 13, 2014

Author: Singh_Trn




1. Presentation on ISDN Submitted to:- Submitted By:- Amandeep Singh Taranpreet Singh(1290) 1

2. 2 ISDN The Public Switched Telephone network is still analogue from the subscriber to the local exchange The need has arisen to extend the digital network out to subscribers and to provide a single standardised interface to all different users of public networks ISDN fulfils that need

3. 3 Integrated Services Digital Network Telephone Data terminal PBX Alarm LAN Customer ISDN Interface ISDN central office Packet switched network Circuit switched network Databases Other Networks & services ‘Digital pipe’

4. 4 Benefits to Subscribers Single access line for all services Ability to tailor service purchased to suit needs Competition among equipment vendors due to standards Availability of competitive service providers

5. 5 Architecture Common physical interface ISDN central office Integrated Digital Network Digital circuit-switched backbone Packet-switched network Network-based processing services ISDN subscriber loop Basic 2B+D Primary 30B+D

6. 6 ISDN Standards Contained in the I-series recommendations Issued by CCITT (now ITU-T) Six main groupings I.100 to I.600 series I.100 series - General Concepts I.200 series - Service Capabilities I.300 series - Network Aspects I.400 series - User-Network Interfaces I.500 series - Internetwork Interfaces I.600 series - Maintenance Principles

7. 7 ISDN Channels The Digital pipe is made up of channels - one of three types B channel, D channel or H channel Channels are grouped and offered as a package to users

8. 8 B Channel B channel-64 kbps B is basic user channel – can carry digital data or PCM-encoded voice – or mixture of lower rate traffic.

9. 9 B Channel Four kinds of connection possible Circuit-switched Packet-switched - X.25 Frame mode - frame relay (LAPF) Semipermanent - equivalent to a leased line

10. 10 D Channel D Channel - 16 or 64 kbps Carries signalling information to control circuit-switched calls on B channels Can also be used for packet switching or low-speed telemetry

11. 11 H Channel Carry user information at higher bit rates 384kbps or 1536kbps or 1920kbps Can be used as a high-speed trunk Can also be subdivided as per user’s own TDM scheme Uses include high speed data, fast facsimile, video, high-quality audio

12. 12 ISDN Channels and their Applications B Channel (64 kbps) D Channel (16/64 kbps) H Channel (384/1536 kbps) Digital voice Signalling (using SS#7) High-speed trunk High-speed data (e.g. packet and circuit switched data) Low- speed data, (e.g. packet, terminal, videotex) Very high speed data Other (e.g. fax, slow video) Other (e.g. telemetry) Other (e.g. fast fax. Video)

13. 13 Broadband ISDN Recommendations to support video services as well as normal ISDN services Provides user with additional data rates – 155.52 Mbps full-duplex – 155.52 Mbps / 622.08 Mbps – 622.08 Mbps full-duplex Exploits optical fibre transmission technology Very high performance switches

14. 14 B-ISDN Architecture Narrowband Capabilities Broadband Capabilities TE LFC LFC TE Inter-exchange Signalling Capabilities BISDN User to Network Signalling TE = Terminal equipment LFC = Local function capabilities

15. 15 B-ISDN ATM is specified for Information transfer across the user-network interface Fixed size 53 octet packet with a 5 octet header Implies that internal switching will be packet-based

16. Thank u 16

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