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Sidevõrgud IRT 0020 loeng 2 18. sept. 2005

Sidevõrgud IRT 0020 loeng 2 18. sept. 2005. Avo Ots telekommunikatsiooni õppetool raadio- ja sidetehnika instituut avots@lr.ttu.ee. Backbone network design layers. Layering. Application. Application. Transport. Transport. Network. Network. Network. Datalink. Datalink. Datalink.

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Sidevõrgud IRT 0020 loeng 2 18. sept. 2005

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  1. SidevõrgudIRT 0020loeng 2 18. sept. 2005 Avo Ots telekommunikatsiooni õppetoolraadio- ja sidetehnika instituut avots@lr.ttu.ee

  2. Backbone network design layers

  3. Layering

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

  5. network link physical transport application transport network link physical application transport network link physical application transport network link physical application transport network link physical data data data ack transport Andmeülekanne (loogiline)

  6. network link physical application transport network link physical application transport network link physical application transport network link physical application transport network link physical data data Andmeülekanne (füüsiline)

  7. source destination message M M H H H H H H H H H H H H l n n l n t t t t n t t segment M M datagram M M application transport network link physical application transport network link physical frame M M Sõnumiülekanne

  8. FTP Telnet HTTP HTTP coaxial cable fiber optic Telnet FTP packet radio packet radio coaxial cable fiber optic Vahekihid

  9. 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

  10. Töökindlus router sender receiver L2 L2 L1 L1 L1 • Solution 1: make each step reliable, and then concatenate them • Solution 2: end-to-end check and retry

  11. sender receiver L2 L2 L1 L1 L1 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?

  12. Routed Backbone

  13. Collapsed backbone

  14. Central Parking’s collapsed backbone

  15. ATM Virtual Circuits

  16. ATM Encapsulation

  17. Protokollid http://www.private.org.il/tcpip_rl.html http://www.eix.co.uk/Ethernet/ http://www.mfaforum.org/education/atm_presentations.shtml http://www.mfaforum.org/education/atm_cs.shtml http://www.mfaforum.org/tech/superdemo_2004.pdf

  18. Process/ Application Host-to-Host Internet Network Access ISO OSI vs DoD mudel 7 6 5 4 3 2 1

  19. Võrkude ja teenuste ühendamine T G T T T T T R R T

  20. Spectrum Usage • Licensed Bands • 2.5GHz (2.3-2.4; 2.5-2.7) • 3.5GHz (3.3-3.7) • Unlicensed Band • 5.8GHz (5.25-5.85) N. America 2.5 & 5.8 GHz W. & E. Europe APAC 3.5 & 5.8 GHz 3.5 & 5.8 GHz Middle East & Africa Central & S. America 2.5, 3.5 & 5.8 GHz 3.5 & 5.8 GHz

  21. Kihtide vahelised seosed rakendus esitlus Võrgurakenduse teenus seanss transport Transporditeenus võrk kanal Võrguteenus füüsiline

  22. 7 Application e. g. Workflow 6 Presentation G.711 / G.723.1 / G.729 5 Session H.323 / H.450 / RTP 4 Transport TCP / UDP 3 Network IP DiffServ 2 Data Link MAC 802.1 D 1 Physical Transmission Medium Mudeli täiendused

  23. Simple Mail Transfer Protocol • RFC0821 (august 1982) J. Postel, RFC2821 (aprill, 2001) • Sõnumite töökindlaks saatmiseks • Klient-server mudel • Ühendusele orienteeritud ja kinnitustega protokoll • TCP port 25

  24. Lõpulingid • Kõik RFC-d:http://www.ietf.org/iesg/1rfc_index.txt • Infotehnoloogia reeglid Eesti keele ja kultuuri keskkonnas EVS 8:2000http://www.eki.ee/itstandard/sisukord.html • www.ieee.org

  25. Application WAE, HTTP, RFC821,822 Rakendus 7 6 5 4 3 2 1 Presentation ISO 8859-15 Esitlus SSL, WSP Seanss Session TCP RFC 793, UDP RFC 768 Transport Transport Network RFC 791 IP,RFC 792 ICMP Võrk IEEE 802.11a Data link Kanal Physical Füüsiline (ühendus) Cat5, RS-232D Kihid

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

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

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

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

  30. Link • http://www.mmwave.com/pdf/Alvarion.pdfKõik RFC-d:http://www.ietf.org/iesg/1rfc_index.txt • Infotehnoloogia reeglid Eesti keele ja kultuuri keskkonnas EVS 8:2000http://www.eki.ee/itstandard/sisukord.html • www.ieee.org

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