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Eastern Illinois University
Additional questions about
Data & Signals
Data and signals
What is the basic function of a modem?
To convert digital data into analog signals and back again.
What is the basic function of a codec?
To convert analog data into digital signals and back again.
In what kind of translator device digital encoding
techniques, like NRZ-L or Differential Manchester, could
be implemented? And why these kind of devices are
In devices like DSU because digital data must be converted
to digital signals for proper transmission over a medium.
Data and signals
What is the spectrum of a signal?
The range of frequencies that a signal spans from minimum to
How does baud rate differ from bit rate?
Baud rate is the number of clock cycles per second. The Bit rate, on
the other hand, is the number of bits per second. In each clock cycle
one or more bits could be sent The following formula shows the
relation between the two: Bit Rate = Baud Rate * Bits per clock cycle
Why we need to use a translator when both device (or source of
data) and line are digital?
Usually the device and the line use different signaling formats
(different bit rate, different number of possible states, different voltage
level, etc.). So, a translator is needed to convert between the two
different formats.