Kommunikatsiooniteenuste arendus IRT 0080 Loeng 1 Avo Ots

Kommunikatsiooniteenuste arendus IRT 0080 Loeng 1 Avo Ots telekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst. avo. ots@ttu. ee 1

Tehnoloogiad Võrgutehnoloogia: • kanalitehnoloogia • võrgusõlme tehnoloogia TEENUSED RIISTVARA & TARKVARA 2

Application APP UNI Layer APP Service Network Service Switching Layer Network Transmission Layer Physical Layer NNI Switching Network Transmission Network CPE NNI Physical Network Physical Interface Physical Network Logical Interface NNI Physical Network Service Access Point 3

Service Independent Block Components Service Independent Block Service Logic Service Independent Block Service Logic Control Service Switching Service Access Service Switch Service Service Access Access Session Control (Circuit Switching control) Call/ Call/ Session Session 4

Client Application Server APP Layer IP Network CPE Layer Server ISP ISP Applications Packet IP Switching Network Layer Transmission Server Physical Interface IP Switching Network NNI Transmission Network Packet APP Network Logical Interface CPE NNI Transmission Network Service Access Point 5

Off-line customer management Extended call control and IN charging Terminal Telecom basic service/call control Access Service Transmission Access Service Linear Service Architecture in Legacy Network: Static Services A User Service Management A Home Service B User Service Management Control Service A Terminal A Portal B Portal Session Service Access Transmission Access Two-Dimension Service Architecture in NGN: Active Services B Terminal 6

Profiilid terminal (laptop/PDA) GUI application access wizard: access wizard agent Mobile IP client support for access selection Mobile IP Foreign Agent Mobile IP Home Agent access manager: access discovery AAA server profile server access selection link manager: application server user profile: operator’s information about user terminal network personal characteristics: capabilities: preferences: bandwidth, cost, Qo. S, operator, . . . screen size, processing capacity, . . . for choice of access etc. 7

Võrgukomponendid ja haldus 8

Teenused võrgu kaudu 9

Lüüs/marsruuter G R 10

Kihid 7 6 5 4 3 2 1 Rakendus Application Esitlus Presentation WAE, HTTP, RFC 821, 822 ISO 8859 -15 Session SSL, WSP Transport TCP RFC 793, UDP RFC 768 Võrk Network Seanss Kanal Füüsiline (ühendus) Data link Physical RFC 791 IP, RFC 792 ICMP IEEE 802. 11 a Cat 5, RS-232 D 11

Võrgud communication networks switched networks circuit-switched networks (e. g. telephone) datagram networks (e. g. Internet) broadcast networks packet-switched networks virtual circuitswitched networks (e. g. ATM) 12

Layering 13

Ülemise ja alumised kihid r. Lower three layers are hop-by-hop r. Next two layers are end-to-end Application Transport Network Datalink Physical medium 14

Andmeülekanne (loogiline) data application transport network link physical ack data network link physical application transport network link physical data application transport network link physical 15

Andmeülekanne (füüsiline) data application transport network link physical application transport network link physical data application transport network link physical 16

Sõnumiülekanne source M Ht M Hn Ht M Hl Hn Ht M application transport network link physical destination application Ht transport Hn Ht network Hl Hn Ht link physical M message M segment M datagram M frame 17

Vahekihid FTP Telnet coaxial cable fiber optic HTTP packet radio HTTP FTP fiber optic packet radio 18

Funktsioonijaotus • The application knows the requirements best, place functionality as high in the layer as possible • If the application can implement a functionality correctly, implement it at a lower layer only as a performance enhancement • Think twice before implementing a functionality that you believe that is useful to an application at a lower layer 19

Töökindlus sender router L 2 L 1 receiver L 1 • Solution 1: make each step reliable, and then concatenate them • Solution 2: end-to-end check and retry 20

Töökindluse tagamine • The receiver has to do the check anyway! • Thus, full functionality can be entirely implemented at the upper layer; no need for reliability from lower layers • Is there any need to implement reliability at lower layers? sender receiver L 2 L 1 L 1 21

Teenuste keskkond 22

Voogude kulg Security Measures Signaling Networks Transport / Interconnect Networks Access Networks RTP & Payload Subnet 4 Signaling Path Subnet 3 Subnet 2 Subnet 1 (Wireline & Wireless) 23

Teenuste tagamine Signaling Networks d Security Measures li Va te u ro Re D Att OS ack c fi af Tr Transport / Interconnect Networks Access Networks (Wireline & Wireless) Signaling Path Enterprise or Peer Point Network 24

Kokkuühendamine SS 7 Rec. Q. 931 PSTN/ISDN k twor Ne s erie s 0 0 . 7 . Q Rec PSTN/ISDN Frame Relay Networks IWF Rec. I. 580 Rec. Q. 2931, PNNI IWF Rec. I. 555 Rec. I. 580 IETF RFCs ATM Networks IWF Wireless access FR OSF & NM IWF IP-based Networks Rec. Y. 1310 ATM OSF & NM, M series Rec. SNMP based 25

Hajutatud töökeskkond Firma Filiaal INTERNET ISP DNS MAIL ISP Kaugtöökohad 26

Backbone network design layers 27

Routed Backbone 28

Collapsed backbone 29

Central Parking’s collapsed backbone 30

ATM Encapsulation 31

Võrkude ühiskasutus cdma 2000 1 x operator 1 Adhoc Network cdma 2000 1 x operator 2 IP Network Web Server WLAN Edge GPRS Ethernet 32

Võrguliikluse jaotus 33

Võrgud ja terminaalid Network Intelligence Servers Terminals client application Libraries Service Provider Servers network applications Programming Libraries network capabilities Client resource controllers Network (PSTN, PLMN, IP) Resources and Special Resources 34

Protokollid http: //www. private. org. il/tcpip_rl. html http: //www. eix. co. uk/Ethernet/ 35