mod 4.2 reti wan. interfacce seriali trasmissione seriale e parallela
TRANSCRIPT
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Mod 4.2
Reti WAN
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INTERFACCE SERIALI
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Trasmissione seriale e parallela
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Trasmissione sincrona e asincrona
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Trasmissione asincrona
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Trsmissione sincrona
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Controllo di flusso
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Interfacce seriali: RS-232
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RS-232
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Schema dei pin della RS-232
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Tabella:
Tabella
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Vincoli al RS-232
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Interfacce :RS-422 RS-449
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Standard :RS-530/V.35
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Interfaccia V.35
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MODEM
.
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Tecniche di modulazione
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Modulazione di ampiezza
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Modulazione di frequenza
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Trasmissione Half-Duplex
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Trasmissione Full-Duplex
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Standard
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Comandi al Modem
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Formato Comandi al modem
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CDA
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Limiti della Commutazione a circuito
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La Commutazione a pacchetto
1
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Canali DirettiAnalogici
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CDN/ISDN
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CDN
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PDH
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Limiti di PDH
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SDH
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Schema logico(stratificazione dei protocolli) di SDH
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ISDN
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Architettura ISDN
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Interfacce ISDN
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Introduzione
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Protocollo HDLC / ISO/OSI
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Protocolli orientati ai bit
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Hdlc:SERVIZI
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Connessioni HDLC:Bilanciata e Sbilanciata
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ModalitàHDLC :NRM ARM ABM
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Modalità di trasferimento
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Trama
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FLAG
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Bit stuffing
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Trama HDLC
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Formato della trama
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Gestione dell’Errore
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Rilevazione e Correzione Errore
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Point-to-Point-Protocol
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X.25
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Struttura esterna di X.25
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Struttura interna di X.25
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X.25
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Frame Relay
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Rete Frame Relay
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Esempio di rete FRAME RELAY
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SMDS
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Esempio di rete SMDS
Rete SMDS che interconnette 2 reti Ethernet tramite router
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ATM:1
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ATM:2
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Obiettivi di ATM
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Confronto ATM /TCP-IP
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Stratificazione ATM
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Architettura ATM e LAN ATM
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Tabella di Analisi comparata