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Introduction to Networking and Data Communication

Data Communication

By the end of the lesson you should be able to: Define data communication terminologies

Data Communication Terminologies

Data signal - This refers to voltage level that flow in a circuit denoting a given information.

Analog Signal - Refers to electrical signal that varies continuosly in a circuit

Digital Signal -refers to a sequence of discrete pulses of 1's and 0's. Here the voltage above a certain level is considered 1 and voltage below the same level is considered 0

Serial Data Transmission - Data is transmitted over a single communication path. Bits are  tranferred down the line one at a time.

Parallel Data Transmission - Data is transffered using several transmission paths.

Signal Modulation and demodulation - Modulation refers to conversion of digital signals to analog signals at the transmission end while demodulation refers to conversion of analog data back to digital at the receiving end. The device that performs demodulation and modulation is known as Modem

Multiplexing - refers to the process of transmitting difference data signals on the same communication medium.

Demultiplexing - refers to the process of separating the multiplexed signal at the receiving end

Bandwidth - Refer to the amount of data that can be transferred by a transmission medium per second.

Baseband signal - digital signal generated and applied to transmission medium without modulation.

Broadband transmission- this where an analog signal is sent over a transmission medium using a particular frequency

Attenuation - this refers to loss of strength of data signals during transmission through a data transmissin medium

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