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Two Ways to Think About Connected Systems Architectures and Connections Architectures range from fully centralized to fully distributed. Centralized are typically master-slave connections while distributed are typically multiple access peer to peer. Somewhere in the middle is the client- server paradigm.
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Centralized vs. Distributed Advantages of each Disadvantages of each
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Relationships Between Computers Master-Slave –one is in control, one does what it is told Client-Server –both are autonomous –server provides some 'service' or resource to the client Peer-to-Peer –both are equals
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Line Configurations Line configuration – the way in which two or more devices attach to a link Link – physical path over which data is transferred Types of Line configurations –Point to Point –Multipoint
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LINK POINT TO POINT
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MULTIPOINT LINE
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TOPOLOGY Topology –Physical configuration of connection of devices –Example topologies Mesh Star Tree Bus Ring Hybrid
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TRANSMISSION MODES Defines direction of information flow Types of transmission modes –Simplex –Half Duplex –Full Duplex
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HALF DUPLEX Single, shared physical medium Information can flow in either direction Information flows in one direction only at a given time.
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FULL DUPLEX Two independent channels (physical media) Information flow in both directions simultaneously
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RS232C DTE DCE DTE Generates Data Converts to transmission media/ converts to generated data Receives Data (Network) DCE Converts to transmission media/ converts to generated data
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RS232C u 25 pins assignments
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RS232C – DB9 1 - carrier detect 6 – DCE ready 2- Receive7 – RTS 3 – Transmit 8 – CTS 4 – DTE ready9 – Ring Indicator 5 - SG
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Null Modem
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