Thursday, 8 October 2020

Electromagnetic transmitting media


Electromagnetic transmitting media is a path that carries information from the sender to the receiver. We use different types of cables or waves to transfer data. Data is naturally transmitted through electrical or electromagnetic signals.


An electrical signal in the form of a current. An electromagnetic signal is a series of pulses of electromagnetic energy at different frequencies. These signals can be transmitted through copper wires, optical fibers, atmosphere, water, and vacuum. Different media have different characteristics such as bandwidth, delay, cost, ease of installation, and maintenance. Transportation is also called a channel of communication.


Types of transportation modes

The modes of transportation are broadly classified into two groups.


Wired or directed media or restricted transport modes:

Restricted modes of transport are tangible or physical cables and are restricted to physical geography. Common tethered transmission media used are twisted pair cable, coaxial cable, and fiber optic cable. Each of them has its own characteristics like transmission speed, noise effect, physical appearance, cost, etc.


Wireless or unguided or unlimited transmission media:

Unlimited transmission media are the methods of transmitting data without using any cables. These media are not related to physical geography. This type of transmission is called wireless communication.


Electromagnetic transmitting media Nowadays wireless communication is becoming popular. Wireless LAN networks are installed in universities and colleges. This transmission uses a microwave, radio waves, infrared rays are some of the popular unbound transmission methods.


Multimedia data transfer capabilities differ differently depending on various factors.

These factors are:


1. Bandwidth. It indicates the data-carrying capacity of a channel or medium. High-bandwidth communication channels support higher data rates.


2. Radiation. It indicates leakage of the signal from the medium due to the unwanted electrical properties of the medium.


3. Noise absorption. It indicates the susceptibility of the media to external electrical noise that can cause data signal distortion.


4. Ease. It indicates a loss of energy as the signal propagates outward. The amount of energy lost depends on the frequency. The irradiance and physical properties of the media contribute to attenuation.


Signal transmission principles

Before two computers can communicate together, two conditions must be met:

1 - That the data is translated into signals that can be transferred between the two devices.

2 - The two devices must have a channel through which they can send and receive signals.


Computers can use the following types of signals to communicate with each other:

1 -pulses of electrical or electrical impulses.

2 -waves of radio or radio waves.

3 - microwaves or microwaves.

4 -light infrared or infrared.

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