ITM 301 Chapter Notes - Chapter 5: Twisted Pair, Line Code, Statistical Time-Division Multiplexing

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Chapter 5 Network Cabling
Transmission Basics
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This setio oes fudaetal haateistis that defie toda’s data tasissio
Analog Signaling
Analog signals - vary infinitely and continuously
o Appear as a wavy line when graphed over time
Analog signals are characterized by four properties:
o Amplitude
Measure of strength at given point in time
o Frequency
Number of times amplitude cycles over fixed time
o Wavelength
Distance between one peak and the next
o Phase
Progress of wave over time compared to a fixed point
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Drawback of analog signals
o Varied and imprecise voltage
Susceptible to transmission flaws
Digital Signaling
Digital signals
o Pulses of voltages
Positive voltage represents a 1
Zero voltage represents a 0
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Data Modulation
Data relies on digital transmission
Network connection may handle only analog signals
Modem
o Accomplishes this translation
o Modulator/demodulator
Data modulation
o Technology modifying analog signals into digital signals and vice versa
o Make analog signals suitable for carrying data over a communication path
Carrier wave
o Combined with another analog signal
o Produces unique signal
Transmitted from one node to another
o Preset properties
o Purpose: convey information
Information wave (data wave)
o Added to carrier wave
o Modifies one carrier wave property
Frequency modulation
o Carrier frequency modified by application of data signal
Amplitude modulation
o Carrier signal amplitude modified by application of data signal
Digital subscriber line (DSL)
o Also makes use of modulation
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