Analog, digital

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True Digital Signals (Wired)

Generally cheaper than analog signaling

Analog data, digital signal

analog data are encoded using codec to produce a digital bit stream

True Digital Signals (Wired)

A sequence of voltage pulses that may be transmitted over a copper wire medium

analog signal, digital transmission

Assumes that the analog signal represents digital data. Signal is propagatedthrough repeaters; ateach. repeater, digital data are recovered from inbound signal andused to generate a new analog outbound signal.

Radio Attenuation in Free Space

Attenuation loss varies with distance d between transmitter and receiver and with the wavelength lambda

Digital data, analog signal

Digital data are encoded using a modem to produce analog signal.

digital signal, digital transmission

Digital signal represents a stream of Is and Os, which may represent digital data or may be an encoding of analog data. Signal is propagated through repeaters; at each repeater, stream of Is and Os is recovered from inbound signal and used to generate a new digital outbound signal

True Digital Signals (Wired)

Digital signals can propagate (digitized) analog and digital data

analog signal, analog transmission

Is propagated through amplifiers; same treatment whethersignal is used to represent analog data or digital data.

True Digital Signals (Wired)

Less susceptible to noise interference

True Digital Signals (Wired)

Suffer more from attenuation

Digital data, digital signal

Two alternatives: (1) signal consists of two voltage levels to represent the two binary values; (2) digital data are encoded to produce a digital signal with desired properties.

Analog data, analog signal

Two alternatives: (l)signal occupies the same spectrum as the analog data; (2) analog data are encoded to occupy a different portion ofspectrum

Attenuation

depends on the medium and on frequency and distance travelled

Attenuation

is the gradual signal loss due to travel through a medium

digital signal, analog transmission

not used


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