As a network and telecom engineer and steemit blogger, it's a pleasure for me to start a serie of blogs called "TechTalk" to share with you some information about my specialty area. I prefered to talk in the first episode of this serie about history and especially about the evolution of communication.
The entire voyage of communication began with the cavemen who used to assemble around flame to talk about their everyday exercises, which can contrasted with cutting edge online networking, for example, facebook or steemit. The one sudden day the cavemen chose to record their insight and exercises and they began to writing on the caverns. The issue with this communication was it was localised. At the point when individuals began moving out of the holes, long distance communication turned out to be vital.
SMOKE SIGNAL
This was the main long distance communication, it was utilized as a part of North America where every clan has its own particular flagging framework, a smoke from top of the hill implied peril. Smoke signals were additionally used as a part of Ancient China, the soldiers positioned at the Great Wall would caution for danger using smoke motion from tower to tower, along these lines they could transmit message concerning as 750 Km withing a couple of hours.
PIGEONS
Because of their regular homing ability, pigeons were broadly utilized for long distance communication by Persians, Romans and Greeks. In nineteenth Century, they were likewise used to transmit stock citations starting with one city then onto the next. "Cher ami", a homing pigeon, was granted the French War for her services amid World War 1.
PONY EXPRESS
From antiquated time, rulers have been utilizing human errand person to hand-off messages, Pony Express was a first in its kind mail service conveying messages, mails, newspapers and little bundles by hoseback using transfer stations. It was operating in the mid nineteenth Century over a distance of 2900 Km between St. Joseph, Missouri, and Sacramento, California.
SEMAPHORE FLAG
Semaphore flag was utilized as a part of oceanic amid the late nineteenth Century. The word semaphore is gotten from greek word (sema = sign and phero = bearer), it's the telecommunication framework passing on data at a distance by methods for visual signs with hand-held banners, poles and plate. It's still used during underway replenishment at sea and is acceptable mode of communication for emergency.
TELEGRAPH
Telegraphy was the best leap forward in the field of communication. In spite of the fact that the smoke flag and semaphore banners were diverse type of telecommunication yet the outfitting of power in the late nineteenth Century gave birth to electric telegraphy. Morse code is as yet utilized internationally as a method of communication. Till a few decades prior Telegraphy was the most well known type of long distance communication. The US ceased the utilization of Telegraph in 2006. India's BSNL possessed transmit benefit finished in 2013. It was reportedly the world's last existing true electric commercial telegraph system.
RADIO
The term Radio in latin means Beam of light. In 1864 James Clerk Maxwell showed scientifically that electromagnetic waves could propagate through free space. The impacts of electromagnetic waves were seen when Maxwell yet nobody could identify its presence. In 1886 Heinrich Hertz built up the presence of Electromagnetic Waves. In 1888 he exhibited that one could deliver and detect electromagnetic waves which we today call as radio waves. In November 1894 Jagadish Chandra Bose at Town Hall of Kolkata touched off black powder and rang a chime avoided as much as possible utilizing microwave. During the same time an Italian Scientist Guglielmo Marconi made an electric chime which went off amid lightning. This was only the start of a radical new time of distant communication. Mid twentieth century radio framework transmitted message using continuous waves only. Amplitude modulation was shown for the transmission of voice and music yet with little achievement. World War 1 quickened the advancement of radio for military communication. After the war business radio telecom started in 1920 and was a major hit. World war 2 again accelerated the improvement of wartime purposes for aircraft and land communication.
TELEPHONE
Until now real time communication was was confined to diplomatic purposes or for broadcasting. Still telegram was the Fastest one to one communication used by common people. In 1876 Alexander Graham Bell invented the telephone. At first, the benefits of a telephone exchange were not exploited. Instead telephones were leased in pairs to a subscriber, who had to arrange for a telegraph contractor to construct a line between them, for example between a home and a shop. It was a luxury that only rich people could afford. Later telephones took advantage of the exchange principle already employed in telegraph networks. Each telephone was wired to a local telephone exchange, and the exchanges were wired together with trunks. Networks were connected in a hierarchical manner until they spanned cities, countries, continents and oceans. This was the beginning of the public Switch Telephone Network or PSTN. The major progress took place after the second world war.
So friends,as we have seen history of communication started from caveman to telephone, I will try in the next blog of this serie to talk about the evolution of communication system from wired to wireless. Stay tuned !!
