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IEX8175 RF Electronics

IEX8175 RF Electronics. Avo Ots telekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst. avo.ots@ttu.ee. Networks. communication networks. switched networks. broadcast networks. packet-switched networks. circuit-switched networks (e.g. telephone).

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IEX8175 RF Electronics

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  1. IEX8175 RF Electronics Avo Otstelekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst.avo.ots@ttu.ee

  2. Networks communication networks switchednetworks broadcastnetworks packet-switched networks circuit-switchednetworks(e.g. telephone) virtual circuit-switched networks(e.g. ATM) datagram networks(e.g. Internet)

  3. Layering

  4. 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

  5. Application Application Transport Transport Network Network Network Datalink Datalink Datalink Physical Physical Physical Physical medium • Lower three layers are hop-by-hop • Next two layers are end-to-end

  6. 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

  7. 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

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

  9. FTP Telnet HTTP HTTP coaxial cable fiber optic Telnet FTP packet radio packet radio coaxial cable fiber optic

  10. 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

  11. 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

  12. 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?

  13. Protokollid http://www.private.org.il/tcpip_rl.html http://www.eix.co.uk/Ethernet/ ftp://ftp.prenhall.com/pub/esm/sample_chapters/cs/stallings/index.html

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