1. Time Division Multiplexing (TDM): In Time Division Multiplexing signals are divided in time domain. Signals from various sources are allowed to flow through the common line one at a time for fixed time. This multiplexing shares a communication circuit among two or more terminals by having them take turns, dividing the circuit vertically. In TDM, one character is taken from each terminal in turn, transmitted down the circuit and delivered to the appropriate device at the far end. Time on the circuit is allocated even when data is not transmitted, so that some capacity is wasted when terminals are idle. 2. Frequency Division Multiplexing: In Frequency Division Multiplexing signals are separated in frequency domain. Signal from each source is modulated to different frequency so that the frequency spectrum after modulation will not overlap. At the receiving end, signals are demodulated. This can be described as dividing the circuit horizontally so that many signals can be trasmitted in a single communication circuit simultaneously. 3. Wavelength division multiplexing: This is a technique modulating various data streams, i.e. optical carrier signals of changing wavelengths of laser light, onto a single optical fiber. This multiplexing enables bi-directional communication as well as multiplication of signal capacity. WDM is actually frequency division multiplexing but referencing the wavelength of light as opposed to the frequency of light as opposed to the frequency of light. 4. When buying a multiplexer, we would choose TDM or FDM. In general, TDM is prefereed to FDM, because it provides higher data transmission speed and because TDM is cheaper and TDM is more efficient than FDM beacuase it does not need guardbands.It is easy to change number of channels in TDM. Solution 1. Time Division Multiplexing (TDM): In Time Division Multiplexing signals are divided in time domain. Signals from various sources are allowed to flow through the common line one at a time for fixed time. This multiplexing shares a communication circuit among two or more terminals by having them take turns, dividing the circuit vertically. In TDM, one character is taken from each terminal in turn, transmitted down the circuit and delivered to the appropriate device at the far end. Time on the circuit is allocated even when data is not transmitted, so that some capacity is wasted when terminals are idle. 2. Frequency Division Multiplexing: In Frequency Division Multiplexing signals are separated in frequency domain. Signal from each source is modulated to different frequency so that the frequency spectrum after modulation will not overlap. At the receiving end, signals are demodulated. This can be described as dividing the circuit horizontally so that many signals can be trasmitted in a single communication circuit simultaneously. 3. Wavelength division multiplexing: This is a technique modulating various data streams, i.e. optical carrier signals of changing wavelengths of la.

1. 1. Time Division Multiplexing (TDM): In Time Division Multiplexing signals are divided in
time domain. Signals from various sources are allowed to flow through the common line one at a
time for fixed time. This multiplexing shares a communication circuit among two or more
terminals by having them take turns, dividing the circuit vertically. In TDM, one character is
taken from each terminal in turn, transmitted down the circuit and delivered to the appropriate
device at the far end. Time on the circuit is allocated even when data is not transmitted, so that
some capacity is wasted when terminals are idle.
2. Frequency Division Multiplexing: In Frequency Division Multiplexing signals are separated in
frequency domain. Signal from each source is modulated to different frequency so that the
frequency spectrum after modulation will not overlap. At the receiving end, signals are
demodulated. This can be described as dividing the circuit horizontally so that many signals can
be trasmitted in a single communication circuit simultaneously.
3. Wavelength division multiplexing: This is a technique modulating various data streams, i.e.
optical carrier signals of changing wavelengths of laser light, onto a single optical fiber. This
multiplexing enables bi-directional communication as well as multiplication of signal capacity.
WDM is actually frequency division multiplexing but referencing the wavelength of light as
opposed to the frequency of light as opposed to the frequency of light.
4. When buying a multiplexer, we would choose TDM or FDM. In general, TDM is prefereed to
FDM, because it provides higher data transmission speed and because TDM is cheaper and TDM
is more efficient than FDM beacuase it does not need guardbands.It is easy to change number of
channels in TDM.
Solution
1. Time Division Multiplexing (TDM): In Time Division Multiplexing signals are divided in
time domain. Signals from various sources are allowed to flow through the common line one at a
time for fixed time. This multiplexing shares a communication circuit among two or more
terminals by having them take turns, dividing the circuit vertically. In TDM, one character is
taken from each terminal in turn, transmitted down the circuit and delivered to the appropriate
device at the far end. Time on the circuit is allocated even when data is not transmitted, so that
some capacity is wasted when terminals are idle.
2. Frequency Division Multiplexing: In Frequency Division Multiplexing signals are separated in
frequency domain. Signal from each source is modulated to different frequency so that the
frequency spectrum after modulation will not overlap. At the receiving end, signals are
demodulated. This can be described as dividing the circuit horizontally so that many signals can

2. be trasmitted in a single communication circuit simultaneously.
3. Wavelength division multiplexing: This is a technique modulating various data streams, i.e.
optical carrier signals of changing wavelengths of laser light, onto a single optical fiber. This
multiplexing enables bi-directional communication as well as multiplication of signal capacity.
WDM is actually frequency division multiplexing but referencing the wavelength of light as
opposed to the frequency of light as opposed to the frequency of light.
4. When buying a multiplexer, we would choose TDM or FDM. In general, TDM is prefereed to
FDM, because it provides higher data transmission speed and because TDM is cheaper and TDM
is more efficient than FDM beacuase it does not need guardbands.It is easy to change number of
channels in TDM.