DCN_rpj5

DCN_rpj5 - 1 NT503: Data Communication &...

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Unformatted text preview: 1 NT503: Data Communication & Networking Data transmission 2 Physical layer functions Function of physical layer is to move information across a transmission medium Information can be in the form of data, voice, image, video or a combination of these Prior to transmission, information must be transformed into electromagnetic signals (analogue or digital) Information can be: Analogue e.g. human voice. Digital e.g. data stored in the memory of a computer in the form of 0s and 1s. 3 Signals Analog Signals: A continuous waveform that changes over time Can have infinite number of values Digital Signals: Can have only a limited number of values 4 Signals Signals can be of two forms: Periodic: consists of a continuously repeated pattern Aperiodic (non-periodic): has no fixed repetitive pattern 5 Analogue Signals Analogue signals can be classified as: Simple analog signal (e.g. sine wave) Can not be decomposed into simpler signals Composite analog signal (e.g. square wave) Can be decomposed into multiple sine waves of Multiple frequencies 6 Sine waves Sine wave can be fully described by three characteristics, Amplitude Refers to the peak (or height) of the signal and is measured in volts Period or frequency Period (T) refers to the amount of time it takes a signal to complete one cycle. Measured in seconds, ms, s, ns, ps. Frequency (f) is the number of cycles per second and measured in Hertz (Hz), kHz, MHz, GHz, THz....
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This note was uploaded on 07/15/2011 for the course ECO 2023 taught by Professor Mr.raza during the Summer '10 term at FAU.

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DCN_rpj5 - 1 NT503: Data Communication &...

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