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ISDN

ISDN. Ksenija Furman Jug ARNES ksenija.furman@arnes.si. Why ISDN?. ISDN - Integrated Services Digital Network Telephone services -> Telecommunication services Used for voice, image and data. ISDN protocols. E - series for Telephone network and ISDN

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ISDN

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  1. ISDN Ksenija Furman Jug ARNES ksenija.furman@arnes.si ISDN, CEENet Workshop '97, Zagreb, August '97

  2. Why ISDN? • ISDN - Integrated Services Digital Network • Telephone services -> Telecommunication services • Used for voice, image and data ISDN, CEENet Workshop '97, Zagreb, August '97

  3. ISDN protocols • E - series for Telephone network and ISDN • I - series for ISDN concepts, aspects and interfaces ISDN, CEENet Workshop '97, Zagreb, August '97

  4. ISDN and OSI model • Layer 1 - Physical (2B1Q) • Layer 2 - Data Link (Q.920 - Q.923) • Layer 3 - Network (Q.930 - Q.939) ISDN, CEENet Workshop '97, Zagreb, August '97

  5. 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 ISDN, CEENet Workshop '97, Zagreb, August '97

  6. 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)) ISDN, CEENet Workshop '97, Zagreb, August '97

  7. 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 ISDN, CEENet Workshop '97, Zagreb, August '97

  8. 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 subaddress ISDN, CEENet Workshop '97, Zagreb, August '97

  9. Interfaces and Devices ISDN devices TE1 4W 2W NT1 S/T interface U interface TE2 TA Analog devices: phone, Fax III,... Rate adaptation ISDN, CEENet Workshop '97, Zagreb, August '97

  10. 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) ISDN, CEENet Workshop '97, Zagreb, August '97

  11. Using ISDN for IP Data Networks • Characteristics • Speed • Fast call setup • Bandwidth on Demand ISDN, CEENet Workshop '97, Zagreb, August '97

  12. Using ISDN for IP Data Networks • Modes of Usage • Dial Up (LAN or host) • Bandwidth on Demand • Backup lines • Permanent connections ISDN, CEENet Workshop '97, Zagreb, August '97

  13. Dial Up • Providers need: • subscribe for PRI connections or multiple BRI connections • ISDN Access Server ISDN, CEENet Workshop '97, Zagreb, August '97

  14. ISDN Access Servers • Digital modems (accepting analog and ISDN calls) • software busy-out feature • 56 kbit/s technologies • Rate adaption (V.110, V.120,..) • Compression (Stac,..) • Synchronous PPP (with CHAP/PAP authentication) ISDN, CEENet Workshop '97, Zagreb, August '97

  15. ISDN Access Servers 2 • PPP Multilink • BACP • Controlling the number of B-channels per user • D-channel based callback • CLIP - Caller Line Identification Presentation ISDN, CEENet Workshop '97, Zagreb, August '97

  16. Telephone switch 56 k Technology Analog line Access server Digitalline Telephone switch Telephone switch ? Modem <= 33,6 kbps Modem Access server Modem <= 56 kbps ISDN, E1,.. <= 33,6 kbps ISDN, CEENet Workshop '97, Zagreb, August '97

  17. 56 k Prerequisites • Only one analogue/digital conversion • less noise and faster digital lines • Digital Access Server • Same technology in Access Server and in dial-up modem • K56Flex from Lucent Technologies and Rocwell • X2 from U.S. Robotics, Texas Instruments and Cirrus Logic ISDN, CEENet Workshop '97, Zagreb, August '97

  18. 56 k Considerations • 56 k not reached in reality • 43 kbps practical maximum • Cost for upgrading equipment to ITU standard ISDN, CEENet Workshop '97, Zagreb, August '97

  19. Dial Up • Users need for host connections: • subscribe for BRI connection • ISDN Adapter • Users need for LAN connections • subscribe for PRI or BRI connection • ISDN router (commercial, PC version with ISDN Adapter,..) ISDN, CEENet Workshop '97, Zagreb, August '97

  20. Internet Dial Up - Private ISDN Access server ISDNconnection Telephone Network ISDNconnection PC with internal or external ISDN adapter ISDN, CEENet Workshop '97, Zagreb, August '97

  21. Internet Dial Up - LAN ISDN Access Server LAN ISDN connection Telephone Network ISDN connection ISDN router ISDN, CEENet Workshop '97, Zagreb, August '97

  22. ISDN Adapters • Internal/external • Active/passive (for internal) • Integrated NT • Plug for telephone line • Integrated modem • Synchronous PPP (with CHAP/PAP authentication) ISDN, CEENet Workshop '97, Zagreb, August '97

  23. ISDN Adapters 2 • PPP Multilink • Rate adaption (V.110, V.120,..) • CAPI • Compression (Stac,…) ISDN, CEENet Workshop '97, Zagreb, August '97

  24. ISDN Routers • Integrated NT • Plug for telephone line • Integrated modem • Synchronous PPP (with CHAP/PAP authentication) • PPP Multilink • Compression (Stac,…) • Tarrif management ISDN, CEENet Workshop '97, Zagreb, August '97

  25. Bandwidth on Demand • Router to router connections • ISDN call setup when leased line overloaded ISDN, CEENet Workshop '97, Zagreb, August '97

  26. Backup lines • Router to router connections • ISDN call setup when leased line fails ISDN, CEENet Workshop '97, Zagreb, August '97

  27. Equipment • ALL EQUIPMENT COMPATIBLE with existing national ISDN services • Test new equipment first ISDN, CEENet Workshop '97, Zagreb, August '97

  28. Ordering ISDN connections • With or without NT1 • Type of NT (NT1, NT1+2ab,…) • Types of B-channels (data, voice,both) • Usage od D-channel packet data • CLIP (Calling Line Identification Presentation) • Standard or comfort services ISDN, CEENet Workshop '97, Zagreb, August '97

  29. National ISDN variations • USA: 5ESS/DMS100/NI-1/NI-2 • Europe: NET3 • France: VN2/VN3/NET33 • Germany: 1TR6/NET3 • Japan • Australia ISDN, CEENet Workshop '97, Zagreb, August '97

  30. References - URL’s • http://www.alumni.caltech.edu/~dank/isdn/ • for RFCs: http://www.alumni.caltech.edu/~dank/isdn/isdn_ai.html#RFCS • http://www.data.com • http://www.pacbell.com/products/business/fastrak/networking/isdn/info/isdn-guide • http://www.adtran.com/support/isu/mpfaq.html ISDN, CEENet Workshop '97, Zagreb, August '97

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