isdn, ceenet workshop '97, zagreb, august '97 1 isdn ksenija furman jug arnes...
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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 channelsBearer channel (B-channel=64 kb/s) clear
pipe for dataDelta channel (D-channel, 16 kb/s or 64
kb/s) call signaling information:who is calling type of callcalling what number
ISDN, CEENet Workshop '97, Zagreb, August '97 6
Fundamentals
Service typesBasic 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
Speed128 kb/s (160 kb/s) for BRI1920 kb/s (2048 kb/s) for PRI
Fast call setup2 seconds
ISDN, CEENet Workshop '97, Zagreb, August '97 8
Advantages of ISDN (2)
Bandwidth on Demandadding 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
TE1
TE2 TA
NT12W4W
ISDN devices
Analog devices:phone, Fax III,...
Rate adaptation
S/T interface U interface
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Interfaces and Devices
InterfacesS/T (4w)U (2w)
DevicesNT1TE1 - ISDN devicesTE2 - 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
CharacteristicsSpeedFast call setupBandwidth on Demand
ISDN, CEENet Workshop '97, Zagreb, August '97 12
Using ISDN for IP Data Networks
Modes of UsageDial Up (LAN or host)Bandwidth on Demand Backup linesPermanent connections
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ISDN Access Servers
Digital modems (accepting analog and ISDN calls)software busy-out feature
56 kbit/s technologiesRate adaption (V.110, V.120,..)Compression (Stac,..)Synchronous PPP (with CHAP/PAP
authentication)
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ISDN Access Servers (2)
PPP MultilinkControlling the number of B-channels
per userD-channel based callbackCLIP - Caller Line Identification
Presentation
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ISDN Adapters
Internal/externalActive/passive (for internal)Integrated NTPlug for telephone lineIntegrated modemSynchronous PPP (with CHAP/PAP
authentication)
ISDN, CEENet Workshop '97, Zagreb, August '97 16
ISDN Adapters 2
PPP MultilinkRate adaption (V.110, V.120,..)CAPICompression (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)
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Backup lines
Router to router connectionsISDN call setup when leased line fails
ISDN, CEENet Workshop '97, Zagreb, August '97 20
Equipment
ALL EQUIPMENT COMPATIBLE with existing national ISDN servicesTest new equipment first