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Kommunikatsiooniteenuste arendus IRT0080

Kommunikatsiooniteenuste arendus IRT0080. Loeng 2/2008 Avo Ots telekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst. avo.ots@ttu.ee. The Internet. Every machine transparently connected to every other. Kasutuskava muutus. PC era cell phone era. One computer/phone, many users.

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Kommunikatsiooniteenuste arendus IRT0080

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  1. Kommunikatsiooniteenuste arendusIRT0080 Loeng 2/2008Avo Otstelekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst.avo.ots@ttu.ee

  2. The Internet Every machine transparently connected to every other

  3. Kasutuskava muutus PC era cell phone era One computer/phone, many users One computer/phone, one user mainframe era home phone party line Many computers/phones, one user ~ ubiquitous computing  embedded VoIP anywhere, any time any media right place (device), right time, right media

  4. Single layer implemen-tation Applications Applications OS OS Communication Communication • Multi layer implementation • Breaking down into smaller components • Easier to implement Applications Applications OS OS Implementation

  5. Võrgu tipptase

  6. Datagramm vs Virtuaalahel

  7. Multiple Access Protocols Multiple access protocols Contention-based Conflict-free Collision resolution Random access WINDOW, etc ALOHA, CSMA FDMA, TDMA, CDMA, DQDB, etc DQDB: Distributed Queue Dual Bus

  8. Throughput 0.368 Slotted Aloha S 0.184 Aloha G

  9. Vastastikused häired

  10. Message E-Mail Standards (3) Receiver’s Mail Server Sender’s Mail Server Message Body Format Standard Sending E-Mail Client Receiving E-Mail Client RFC 822 or 2822 HTML body UNICODE

  11. Võrgu ülesehitus Internet Gateway Telefonivõrk IP Network Gateway Tugijaam Raadioliides End-to-End IP

  12. MMC (Measure, Model, and Control) Võrguhaldus Models, tools, scripts, databases Häälestus Andmehõive Liiklus Ülesehitus Muutuste tegemine measure control Käigusolev võrk

  13. Paketipõhine telefonilahendus Collaboration IP IVR, IP AAApps Engine Intelligent Contact Manager ICM Applications Voice Mail, UMS Video Voice Portal Call Processing Call Processing GK Directory PSTN • PSTN gateways • Analog phone support IP Network Infrastructure Clients IP SoftPhone

  14. Message Transmission Example

  15. TCP

  16. The Problem • only nodes on the same physical/link layer network could communicate

  17. Solution Gateways

  18. E-Mail Standards (1) SMTP To Send SMTP To Send Receiver’s Mail Server Sender’s Mail Server Simple Mail Transfer Protocol (SMTP) to transmit mail in real time to a user’s mail server or between mail servers Sender-initiated Sending E-Mail Client Receiving E-Mail Client

  19. E-Mail Standards (2) POP or IMAP To Receive Receiver’s Mail Server Sender’s Mail Server POP or IMAP to download mail to receiver when the receiver is next capable of downloading mail. Receiver-initiated Sending E-Mail Client Receiving E-Mail Client

  20. Lingid http://en.wikipedia.org/wiki/Client_server http://en.wikipedia.org/wiki/Application_server ftp://ftp.prenhall.com/pub/esm/sample_chapters/cs/stallings/index.html http://www.williamstallings.com

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