In data communication terminology, a transmission medium is a physical path between the transmitter and the receiver i.e. it is the channel through which data is sent from one place to another. Transmission Media is broadly classified into the following types: Show
1. Guided Media: It is also referred to as Wired or Bounded
transmission media. Signals being transmitted are directed and confined in a narrow pathway by using physical links.
There are 3 major types of Guided Media: (i) Twisted Pair Cable –
Advantages: ⇢ Least expensive ⇢ Easy to install ⇢ High-speed capacity ⇢ Susceptible to external interference ⇢ Lower capacity and performance in comparison to STP ⇢ Short distance transmission due to attenuation
Advantages: ⇢ Better performance at a higher data rate in comparison to UTP ⇢ Eliminates crosstalk ⇢ Comparatively faster ⇢ Comparatively difficult to install and manufacture ⇢ More expensive ⇢ Bulky (ii) Coaxial Cable – Advantages:
Disadvantages:
(iii) Optical Fiber Cable – The cable can be unidirectional or bidirectional. The WDM (Wavelength Division Multiplexer) supports two modes, namely unidirectional and bidirectional mode. Advantages:
Disadvantages:
(iv) Stripline Stripline is a transverse electromagnetic (TEM) transmission line medium invented by Robert M. Barrett of the Air Force Cambridge Research Centre in the 1950s. Stripline is the earliest form of the planar transmission line. It uses a conducting material to transmit high-frequency waves it is also called a waveguide. This conducting material is sandwiched between two layers of the ground plane which are usually shorted to provide EMI immunity. (v) Microstripline In this, the conducting material is separated from the ground plane by a layer of dielectric. 2. Unguided Media: Features:
There are 3 types of Signals transmitted through unguided media: (i) Radio waves – Further Categorized as (i) Terrestrial and (ii) Satellite. (ii) Microwaves – (iii) Infrared – What are used for both the transmission and reception of wireless signals?Antennas are used for both the transmission and reception of wireless signals.
What type of device can be used to assess the quality of a wireless signal?immense physical, emotional, and spiritual pain.. Does 802.11 networks use the same access method as Ethernet networks?The use of the same physical addressing scheme allows 802.11 networks to be easily combined with other IEEE 802 networks, including Ethernet (802.3) networks. However, 802.11 networks use a different access method than Ethernet networks do.
What type of signals follow a number of different paths to their destination because of reflection diffraction and scattering?Because of reflection, diffraction, and scattering, wireless signals follow a number of different paths to their destination.
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