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Unit – I
Introduction: Data Communication, Network Protocols and Standards, Point to Point and Multi Point line configuration, Network Topologies: Mess, Star, Tree, Bus, Ring. Transmission Modes: Simplex, Half Duplex, Networks: LAN, MAN, WAN. The OSI Models: Function of Layers. TCP/ IP Protocol Suit. Signals: Analog and Digital signals, Periodic and Aperiodic signal, Encoding and Modulating: Digital to Digital conversion. Unipolar. Polar Bipolar, Analog to Digital conversion AM, FM, PM.
Transmission of Digital data: Parallel and Serial transmission. DTE/DCE interface, Modems, Guided and Unguided transmission media. Transmission impairment, Performance. Multiplexing: Frequency division, Wave division and Time division multiplexing, the Telephone system, Digital Subscriber Line (DSL), Error Detection and Correction: Types of Error, Redundancy Checks (VRC, LRC, CRC), Error Correction.
Data Link Control: Line Discipline, Flow Control, Error Control Data Link Protocol: Asynchronous and Synchronous Protocols, Character and Bit Oriented Protocols. Local Area Networks: IEEE 802 standards, Ethernet, Token Bus, Token Ring, FDDl Switching: Circuit Switching, Packet Switching, Message Switching.