TAILIEUCHUNG - Transmission methods

A bit (binary digit) is the smallest unit of information • N = 2n where N is the number of representations and n is the number of bits (ex. ASCII, Unicode, PCM code etc.) • Data communications transfer information using codes that are transmitted as signals (either analog or digital) • In general, analog lines provide a slow service that contains high error rates. However, digital lines cannot transmit analog data unless it is converted to a binary format first • Encoder is used to convert the information transmitted by the sender and decoder converts the information back to its original form for the receiver. | Transmission Methods Dr. Ming Huang Topics Bits, Signals, Frames, and Codes Transmission Modes Multiplexing Bits, Signals, and Codes A bit (binary digit) is the smallest unit of information N = 2n where N is the number of representations and n is the number of bits (ex. ASCII, Unicode, PCM code etc.) Data communications transfer information using codes that are transmitted as signals (either analog or digital) In general, analog lines provide a slow service that contains high error rates. However, digital lines cannot transmit analog data unless it is converted to a binary format first Encoder is used to convert the information transmitted by the sender and decoder converts the information back to its original form for the receiver Basic Concepts of Signals All data can be represented by electromagnetic signals. Depending on the transmission medium and the communications environment, either analog or digital signals can be used to convey information Any electromagnetic signal, analog

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