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. 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

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

15. 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

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

17. 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

18. Bandwidth on Demand • Router to router connections • ISDN call setup when leased line overloaded (i.e., ISDN is often used as a backup solution) ISDN, CEENet Workshop '97, Zagreb, August '97

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

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