Modern communication channels
History of means of communication
The forms and methods of communication have varied in ancient times. In the beginning, man used various methods of communication, such as drawing on walls in caves and others. Over time, he developed various languages, which now vary widely. After that, man developed methods of transmitting information by writing letters on paper and transmitted by a messenger from one person to another in different countries. He also managed to use the pigeons that he trained and volunteered to serve, especially in the transmission of messages. These roads were long ways of wasting time and effort in transferring messages between people Except for the lack of effectiveness in emergency circumstances.
After the Renaissance and the development of science in recent centuries, man was able to develop means of communication known to modern means of communication, which is a miracle for this era, and characterized these means with the property of the time, that is the information moves at the time of occurrence between the two points on the globe, Remote, and the price of these devices is very low; two or more people are in more than one place to communicate together as if they were sitting in the same place.
Stages of development of means of communication
The telephone is used when two people want to talk to each other in two separate places without the need to meet. Radio and television broadcasts are used to send information, not to receive information, and to transmit information and local and international news. And various programs for both entertainment and interest. Communication has not stopped there. The concept of e-mail has evolved from slow traditional e-mail to web-based and computer-based e-mail, a fast and free e-mail. The concept of phone and calls has evolved into video calls that have become more effective after the third and fourth generations of the Internet, which have provided tremendous services from service providers and telecommunications companies.
Finally, what was known as smartphones and social media was developed, which was the hair that was divided in the era of the old communications to start a new era completely different, one of the most prominent features of the abolition of the last border between people of different cultures, languages, religions and races.
Satellite refers to the device launched in space and moves around the earth. There are thousands of man-made satellites orbiting the Earth; some take Earth’s satellite imagery to help meteorologists predict the weather and the course of hurricanes, and take pictures of other celestial bodies, such as the sun, black holes, black matter or Distant galaxies. These images help scientists better understand the solar system and the universe in general. It also helps to see large tracts of land simultaneously. This capability means that satellites are able to collect a lot of data faster than the various means used to gather information on the Earth’s surface.
A range of electronic devices are connected by non-wire use by different radio waves to several targets. Most companies use the wireless network instead of wired networks, especially in remote areas to reduce the cost of connecting cables. Wireless networks use radio waves to connect devices, such as laptops, the Internet, and various applications within the company. When wireless computers are connected to wireless access points in public places, the connection to the wireless network is established and the data transfer begins.
There are four main types of wireless networks:
- Wireless Local Area Network (LAN): Consists of two or more devices using the wireless distribution method, and provides a connection through the Internet access point.
- Regional Networks (MAN): Connect several wireless LANs.
- Wide area wireless (WAN): It covers large areas, such as neighboring towns and cities.
- Personal Area Network (PAN): connects devices within a relatively small space.
World Wide Web
The Internet is about millions of computers around the world connected together. With the interconnectedness of this huge number of computers, it is possible to send emails between them at very high speed, in addition to the exchange of files and images, fixed or moving and sounds, where any networked device can exchange data and even speak directly to users in the latest computers without attention to geographical locations for devices. The ARPA was designed by the US Government Advanced Research Projects Agency in 1969 and was first known as ARPANET. The original goal was to create a network that would allow computer research users at a university to talk to a research computer at other universities.
Communication under development
Li Fi is an abbreviation for Light Fidelity, a high-speed, light-based optical communication technology for data transfer, invented by Herald Hass, a professor of communications engineering at the University of Edinburgh, Scotland. It is also rated as one of the best innovations for 2011,
. Li Fi uses visible light from the electromagnetic spectrum to transmit information at very high speeds, in contrast to traditional forms of wireless communication, such as Wi-Fi, which uses radio frequencies (RF) to transmit data. It is also using Li Fi in all the LEDs around the building will be able to cover a larger area of the router used at a single WiFi connection point.