ISDN, CEENet Workshop '97, Zagreb, August '971 ISDN Ksenija Furman Jug ARNES

ISDN, CEENet Workshop '97, Zagreb, August '972 Why ISDN? l ISDN - Integrated Services Digital Network l Telephone services -> Telecommunication services l Used for voice, image and data

ISDN, CEENet Workshop '97, Zagreb, August '973 ISDN protocols l E - series for Telephone network and ISDN l I - series for ISDN concepts, aspects and interfaces

ISDN, CEENet Workshop '97, Zagreb, August '974 ISDN and OSI model l Layer 1 - Physical (2B1Q) l Layer 2 - Data Link (Q Q.923) l Layer 3 - Network (Q Q.939)

ISDN, CEENet Workshop '97, Zagreb, August '975 Fundamentals l 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: l who is calling l type of call l calling what number

ISDN, CEENet Workshop '97, Zagreb, August '976 Fundamentals l 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 '977 Advantages of ISDN l Digital –reliable connection l Speed –128 kb/s (160 kb/s) for BRI –1920 kb/s (2048 kb/s) for PRI l Fast call setup –2 seconds

ISDN, CEENet Workshop '97, Zagreb, August '978 Advantages of ISDN (2) l Bandwidth on Demand –adding new channels to the bundle of channels l Multiple devices –phone, fax, PC, videoconferencing system, router, terminal adapter,.. each with its own subaddress

ISDN, CEENet Workshop '97, Zagreb, August '979 Interfaces and Devices TE1 TE2TA NT1 2W4W ISDN devices Analog devices: phone, Fax III,... Rate adaptation S/T interface U interface

ISDN, CEENet Workshop '97, Zagreb, August '9710 Interfaces and Devices l Interfaces –S/T (4w) –U (2w) l 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 '9711 Using ISDN for IP Data Networks l Characteristics –Speed –Fast call setup –Bandwidth on Demand

ISDN, CEENet Workshop '97, Zagreb, August '9712 Using ISDN for IP Data Networks l Modes of Usage –Dial Up (LAN or host) –Bandwidth on Demand –Backup lines –Permanent connections

ISDN, CEENet Workshop '97, Zagreb, August '9713 Dial Up l Providers need: –subscribe for PRI connections or multiple BRI connections –ISDN Access Server

ISDN, CEENet Workshop '97, Zagreb, August '9714 ISDN Access Servers l Digital modems (accepting analog and ISDN calls) –software busy-out feature l 56 kbit/s technologies l Rate adaption (V.110, V.120,..) l Compression (Stac,..) l Synchronous PPP (with CHAP/PAP authentication)

ISDN, CEENet Workshop '97, Zagreb, August '9715 ISDN Access Servers 2 l PPP Multilink l BACP l Controlling the number of B-channels per user l D-channel based callback l CLIP - Caller Line Identification Presentation

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

ISDN, CEENet Workshop '97, Zagreb, August ' k Prerequisites l Only one analogue/digital conversion –less noise and faster digital lines l Digital Access Server l 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 ' k Considerations l 56 k not reached in reality –43 kbps practical maximum l Cost for upgrading equipment to ITU standard

ISDN, CEENet Workshop '97, Zagreb, August '9719 Dial Up l Users need for host connections: –subscribe for BRI connection –ISDN Adapter l 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 '9720 Dial Up - Private PC with internal or external ISDN adapter Internet ISDN Access server ISDN connection Telephone Network

ISDN, CEENet Workshop '97, Zagreb, August '9721 Dial Up - LAN ISDN connection ISDN router Internet LAN ISDN Access Server Telephone Network

ISDN, CEENet Workshop '97, Zagreb, August '9722 ISDN Adapters l Internal/external l Active/passive (for internal) l Integrated NT l Plug for telephone line l Integrated modem l Synchronous PPP (with CHAP/PAP authentication)

ISDN, CEENet Workshop '97, Zagreb, August '9723 ISDN Adapters 2 l PPP Multilink l Rate adaption (V.110, V.120,..) l CAPI l Compression (Stac,…)

ISDN, CEENet Workshop '97, Zagreb, August '9724 ISDN Routers l Integrated NT l Plug for telephone line l Integrated modem l Synchronous PPP (with CHAP/PAP authentication) l PPP Multilink l Compression (Stac,…) l Tarrif management

ISDN, CEENet Workshop '97, Zagreb, August '9725 Bandwidth on Demand l Router to router connections l ISDN call setup when leased line overloaded

ISDN, CEENet Workshop '97, Zagreb, August '9726 Backup lines l Router to router connections l ISDN call setup when leased line fails

ISDN, CEENet Workshop '97, Zagreb, August '9727 Equipment l ALL EQUIPMENT COMPATIBLE with existing national ISDN services –Test new equipment first

ISDN, CEENet Workshop '97, Zagreb, August '9728 Ordering ISDN connections l With or without NT1 l Type of NT (NT1, NT1+2ab,…) l Types of B-channels (data, voice,both) l Usage od D-channel packet data l CLIP (Calling Line Identification Presentation) l Standard or comfort services

ISDN, CEENet Workshop '97, Zagreb, August '9729 National ISDN variations l USA: 5ESS/DMS100/NI-1/NI-2 l Europe: NET3 l France: VN2/VN3/NET33 l Germany: 1TR6/NET3 l Japan l Australia

ISDN, CEENet Workshop '97, Zagreb, August '9730 References - URL’s l l for RFCs: l l networking/isdn/info/isdn-guide l