This refers to amount of data that canbe transferred through
a communication medium in one second.
The bandwidth of a digital signal is measured in bits/second
or bytes per second.
Bandwidth of analog signal is measured in cycles/second or
Hertz.
This is a communication technique in which digital signalas
are placed on transmission line without a change in modulation.
It means that digital signals are transmitted directly over
a transmission line.
Digital signals are commonly called baseband signals.
Spectrum of a baseband signal, energy E per unit frequency as a function of frequency f. The total energy is the area under the line.
Broadband
This is a technique to transmit large amounts of data such
as voice and video over long distance.
It can send data by modulating each signal onto a different
frequency.
It transmits several streams of data simultaneously using
FDM Frequency Division Multiplexing technique.
FDM divides the bandwidth of a communication line into
smaller frequency bandwidths.
Each part of the communication line canbe used for
transmitting data separately.
Broadband is faster than Base band.
It is used for direct communication between very high speed
computers such as mainframe computers,
It includes microwave,satellite,co-axial cable and
fibre-optic media.
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