ISDN. C. Rigault (ENST) Claude Rigault, ENST, 12/2d/2002 ISDN 1
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1 ISDN C. Rigault (ENST) ISDN 1
2 ISDN 2
3 Content ISDN conditions Channels and interfaces The S interface ISDN services Tele-services Bearer services Digital Releases ISDN 3
4 ISDN conditions The Digital UNI : ISDN ISDN ISDN 4
5 ISDN conditions Digitizing the subscriber loop, why? Several services simultaneously Good quality data transmission (no modem) Have a data transmission billed on volume rather than on time Enjoy new services et supplementary services ISDN 5
6 ISDN conditions A technological challenge : the 4 ISDN requirements Network Isochronization Digital Connexity Common Channel signaling Connexity Achievement of a full duplex digital transmission on 2 leads (Local echo cancellation) ISDN 6
7 ISDN conditions Digital connexity No analog islands ISDN 7
8 ISDN conditions The isochronization requirement Horloge de référence au césium. USRN: Unité de synchronisation du réseau numérique CTP : Centre de transit primaire. USRN CTS : Centre de transit secondaire. USRN USRN CAA : Centre d'abonnés PABX URA URA : Unité de raccordement ISDN 8
9 ISDN conditions Common channel signaling requirement ISDN 9
10 Channels and interfaces The ISDN Channels Connection oriented channels (circuit) (billing by time) B : 64 Kbit/s H : Connectionless Channels (packet) D : 16 or 64 Kbit/s UNFORTUNALY, the D Channel for the Basic rate interface only provides 16 Kbit/s ISDN 10
11 Channels and interfaces The ISDN interfaces The BASIC RA INRFACE (BRI) : 2B+D 2 64 Kbit/s + 16 Kbit/s = 144 Kbit/s The PRIMARY RA INRFACE (PRI) : 30B+D Kbit/s + 64 Kbit/s = 1984 Kbit/s ISDN 11
12 Channels and interfaces Functional groups and reference points S T U V (TNR) (TC) 1 NT1 LT ET 1 (TNA) NT2 (TNR) NT1 1 TA R Domaine de l'usager Domaine de l'opérateur 2 ISDN 12
13 Channels and interfaces The Basic Rate Interface : BRI S U V 144 Kbit/s utiles (TC) TNR LT ET 2 fils, annulation d'écho ISDN 13
14 Channels and interfaces The Primary Rate Interface : PRI S T 1984 Kbit/s utiles V (TC) TNA TNR LT ET 4 fils, MIC ISDN 14
15 Channels and interfaces S interface : The passive S Bus S TNR 144 Kbit/s utiles 150 m ISDN 15
16 Channels and interfaces S interface : The point to point configuration S TNR 1500 m ISDN 16
17 Channels and interfaces S interface : characteristics 8 wire Interface, RJ 45 connector MAMI line code Physical Multiplexing 2B+D by bit frames/s Multiple access CSMA/CR for the D channel LAP D data link control procedure on the D channel Signaling in the bloc mode or in the stimulus mode ISDN 17
18 Channels and interfaces S interface : NT1 functions Echo cancellation DSP ISDN 18
19 S interface : line code Clock Données Signal ISDN 19
20 Level 1 : channel multiplexing D0 D1 D2 D3 B1 B2 B1 B2 B1 B2 B1 B2 D0 D1 D2 D3 t 48 bits in 250 µs ISDN 20
21 Channel multiplexing F L B1 E D0 A Fa N B2 E D1 S B1 E D2 S B E D3 L TNR L D3 L B2 L D2 L B1 L D1 L B2 L Fa L D0 L B1 L F ISDN 21
22 Level 1 : CSMA-CR D0 E0 D1 E1 D2 E2 D3 E3 B1 B1 B1 B1 B1 B2 B1 B2 D0 D1 D2 D3 t Terminal 5 Terminal 1 Code écho ISDN 22
23 Level 2 : LAP D frames FANION D'OUVERTURE ADRESSE: DLCI CONTROLE INFOS FCS : FRAME CHECK SEQUENCE FANION DE FERMETURE ISDN 23
24 DLCI : SAPI and I SAPI C/R EA 0 octet 2 I EA 1 3 T EA C/R SAPI I élément binaire d'extension du champ d'adresse élément binaire de commande/réponse identificateur de point d'accès au service identificateur de point d'extrémité de terminal ISDN 24
25 Level 3 : Q931 signaling PROTOCOLE REFERENCE D'APPEL TYPE DE MESSAGE ELEMENT... D'INFORMATION ELEMENT D'INFORMATION 1 OCT 2 OCTS 1 OCT 1 N ISDN 25
26 Q931: information element IDENTIFICAUR DE L'EI LONGUEUR DE L'EI CHAMP D'INFORMATION DE L'EI 1 OCT 1 OCT N OCTS ISDN 26
27 Q931: information flows O OLEX TLEX T SET UP CALL PROCEED IAM SET UP CALL PROCEED ALERT CONNECT CONN-ACK ACM ANM ALERT CONNECT CONN-ACK DISCONNECT MEDIA REL REL REL RLC RLC UNI NNI ISDN UNI 27 USER PAYLOAD
28 tele-services ISDN Services GLOBAL SERVICE tele-service Negociation of the bearer service Bearer 1 Bearer 2 ISDN 28
29 tele-services tele-service A telecommunication service is a service that require the transfer of signals A tele-service is defined by ITU (Q9) as a telecommunication service encompasses all the aspects of the communication, including the functions of the terminals, in compliance to protocols ISDN 29
30 tele-services Tele-service (examples) Telephony 4 Khz or 7 Khz telecopy 64 Kb/s groupe 4. Tele-action 16 Kb/s. Visio-phony 128 Kb/s. Tele-conference 384 Kb/s. photographic videotex. Audio-videotex 64 Kb/s. teletex 16 Kb/s ou 64 Kb/s. ISDN 30
31 tele-services Tele-service and Bearer service The tele-service is considered as being executable over a variety of Bearer services. Tele-service Global service Bearer service ISDN 31
32 tele-services Tele-service Classification Interactive Services Conversational Services telephony, visiophony, transactional data transmission Messaging Services , voice mail, multimedia mail Information Services Broadcast Services Without user control (TV, radio) With user control (video on demand) ISDN 32
33 tele-services QOS of the various tele-services Interactive Services Conversational Services telephony, visio-phony, transactional data transmission: small transfer delay Messaging Services , voice mail, multimedia mail : unspecified transfer delay Information Services Broadcast Services Without user control (TV, radio With user control (video on demand) ISDN 33
34 Bearer Services Bearer Service A network provides a Bearer service when the signals delivered at the destination point are the same as those at the source point The Quality of Service determines the parameters of the Bearer service One of the most essential parameters is the end to end transfer delay. ISDN 34
35 Bearer Services Bearer Services (examples) 64 Kb/s, transparent switched : CCBT 64 Kb/s, non transparent switched CCBNT 64 Kb/s, connectionless. packets, 64 Kb/s, B channel packets, 16 Kb/s, D channel ISDN 35
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