Data Communications
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- Date Submitted: 08/20/2011 06:38 AM
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Transmission medium - the physical path between transmitter and receiver in a data transmission system.
2 Categories
o Guided transmission media - are those media with some form of conductor that provides a conduit in which electromagnetic signals arte contained.
o Unguided transmission media - are wireless system. Unguided signals are emitted and then radiate through air or a vacuum.
Metallic Transmission Lines - a transmission line is a metallic conductor system use to transfer electrical energy from one point to another using electrical current flow.
Transverse Electromagnetic Waves
2 kinds of waves
o Longitudinal – the displacement (amplitude) is in the direction of propagation.
E.g. surface waves, sound waves.
o Transverse –the direction or displacement is perpendicular to the direction of propagation.
E.g. Electromagnetic waves
Characteristics of Electromagnetic Waves
3 primary characteristics
o Wave velocity – Waves travel at different speeds depending on the type of wave and the characteristics of the propagation medium.
o Frequency – the oscillations of an electromagnetic wave are periodic and repetitive.
o Wavelength – the distance of one cycle occurring in space.
Transmission Lines Classifications
2. classifications
o Balanced transmission lines - both conductors in a balanced line carry signal currents.
o Unbalanced transmission lines – one wire is at ground potential, whereas the other wire is at signal potential.
Metallic Transmission Line Types
• Parallel-conductor transmission lines – comprised of two or more metallic conductors separated by a nonconductive insulating material called a dielectric.
o Open-wire transmission lines –these two-wire parallel conductors, closely spaced and separated by air..
o Twin-lead – essentially the same as open-wire transmission line except that the...
2 Categories
o Guided transmission media - are those media with some form of conductor that provides a conduit in which electromagnetic signals arte contained.
o Unguided transmission media - are wireless system. Unguided signals are emitted and then radiate through air or a vacuum.
Metallic Transmission Lines - a transmission line is a metallic conductor system use to transfer electrical energy from one point to another using electrical current flow.
Transverse Electromagnetic Waves
2 kinds of waves
o Longitudinal – the displacement (amplitude) is in the direction of propagation.
E.g. surface waves, sound waves.
o Transverse –the direction or displacement is perpendicular to the direction of propagation.
E.g. Electromagnetic waves
Characteristics of Electromagnetic Waves
3 primary characteristics
o Wave velocity – Waves travel at different speeds depending on the type of wave and the characteristics of the propagation medium.
o Frequency – the oscillations of an electromagnetic wave are periodic and repetitive.
o Wavelength – the distance of one cycle occurring in space.
Transmission Lines Classifications
2. classifications
o Balanced transmission lines - both conductors in a balanced line carry signal currents.
o Unbalanced transmission lines – one wire is at ground potential, whereas the other wire is at signal potential.
Metallic Transmission Line Types
• Parallel-conductor transmission lines – comprised of two or more metallic conductors separated by a nonconductive insulating material called a dielectric.
o Open-wire transmission lines –these two-wire parallel conductors, closely spaced and separated by air..
o Twin-lead – essentially the same as open-wire transmission line except that the...