ISDN Ksenija Furman Jug ARNES ksenija furmanarnes si

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

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

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

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

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 l l who is calling type of calling what number ISDN, CEENet Workshop '97, Zagreb, August '97 5

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 '97 6

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 '97 7

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 '97 8

Interfaces and Devices TE 1 ISDN devices 4 W S/T interface TE 2 NT 1 2 W U interface TA Analog devices: phone, Fax III, . . . Rate adaptation ISDN, CEENet Workshop '97, Zagreb, August '97 9

Interfaces and Devices l Interfaces – S/T (4 w) – U (2 w) l Devices – – NT 1 TE 1 - ISDN devices TE 2 - analog devices (need TA) TA - Terminal Adapter (rate adaptation (V. 110, V. 120) ISDN, CEENet Workshop '97, Zagreb, August '97 10

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

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 '97 12

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

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

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

56 k Technology Analog line Digital line Access server Telephone switch Modem ? Telephone switch <= 33, 6 kbps Telephone switch Modem Access server <= 56 kbps <= 33, 6 kbps ISDN, CEENet Workshop '97, Zagreb, August '97 ISDN, E 1, . . 16

56 k Prerequisites l Only one analogue/digital conversion – less noise and faster digital lines Digital Access Server l Same technology in Access Server and in dial-up modem l – K 56 Flex from Lucent Technologies and Rocwell – X 2 from U. S. Robotics, Texas Instruments and Cirrus Logic ISDN, CEENet Workshop '97, Zagreb, August '97 17

56 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 '97 18

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 '97 19

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

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

ISDN Adapters 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) l ISDN, CEENet Workshop '97, Zagreb, August '97 22

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

ISDN Routers l l l l 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 24

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

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

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

Ordering ISDN connections With or without NT 1 l Type of NT (NT 1, NT 1+2 ab, …) 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 l ISDN, CEENet Workshop '97, Zagreb, August '97 28

National ISDN variations USA: 5 ESS/DMS 100/NI-1/NI-2 l Europe: NET 3 l France: VN 2/VN 3/NET 33 l Germany: 1 TR 6/NET 3 l Japan l Australia l ISDN, CEENet Workshop '97, Zagreb, August '97 29

References - URL’s l l l http: //www. alumni. caltech. edu/~dank/isdn/ for RFCs: http: //www. alumni. caltech. edu/~dank/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 30