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Andmeside IRT 0030 loeng 7 19. okt. 2005

Andmeside IRT 0030 loeng 7 19. okt. 2005. Avo Ots telekommunikatsiooni õppetool raadio- ja sidetehnika instituut avots@lr.ttu.ee. Rakendus. Infotransport. Paketiedastusteenus võrgus. Voo ülekanne. Broadband. High-end Datacom users. Mobility. Processing capacity

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Andmeside IRT 0030 loeng 7 19. okt. 2005

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  1. AndmesideIRT 0030loeng 7 19. okt. 2005 Avo Ots telekommunikatsiooni õppetoolraadio- ja sidetehnika instituut avots@lr.ttu.ee

  2. Rakendus Infotransport Paketiedastusteenus võrgus Voo ülekanne

  3. Broadband

  4. High-end Datacom users Mobility Processing capacity User interface, e.g. screen-size Mobiilsus

  5. H.320 ISDN MCU GateKeeper Gateway INTERNET H.323 Clients H.323 Videoconferencing

  6. Reliability Is NT as stable as a proprietary operating system? WAN Why shouldn’t the data network be resilient enough for voice needs? Will management risk reduced service levels for telephony?

  7. rtspd Quicktime SNMP RTSP media server RTSP sipconf Telephone RTSP clients Web based configuration SIP conference server sipum Telephone switch SIP/RTSP Unified messaging sipd T1/E1 RTP/SIP 3Com SIP proxy, redirect server SQL database Cisco 2600 gateway Cisco 7960 e*phone Hardware Internet (SIP) phones Pingtel sipc Web server SIPH.323 convertor NetMeeting sip323 Software SIP user agents H.323

  8. Nõuded Käideldavus Töökindlus Terviklikkus Konfidentsiaalsus Saavutamine Arusaamine protsessidest Täiuslikumad seadmed kvalifitseeritum personal otstarbekam rutiin pidev riskianalüüs

  9. ENUM DNS-A (9.1.9.1.e164.arpa) DNS-B (0.5.8.9.1.9.1.e164.arpa) Query 0.0.5.5.0.5.8.9.1.9.1.e164.arpa Query 0.0.5.5.0.5.8.9.1.9.1.e164.arpa Authority = DNS-B Answer = sip:niel@proxy.com proxy.com INVITE INVITE “(919) 850-5500"

  10. Prioriteedid Ethernet kaadris

  11. Web cache – proxy server • Network entity that satisfies HTTP requests on behalf of a client. • Keeps copies of recently requested objects in its own disk storage. • Content distribution. HTTP request HTTP request HTTP response HTTP response proxy server is also client of origin origin server client

  12. Fairness goal: if K TCP sessions share same bottleneck link of bandwidth R, each should have average rate of R/K TCP connection 1 bottleneck router capacity R TCP connection 2 TCP Fairness

  13. Two competing sessions: Additive increase gives slope of 1, as throughout increases multiplicative decrease drops throughput proportionally Why is TCP fair? equal bandwidth share R loss: decrease window by factor of 2 congestion avoidance: additive increase Connection 2 throughput loss: decrease window by factor of 2 congestion avoidance: additive increase Connection 1 throughput R

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