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Evolution Of Cell Phones Essay

1550 words - 6 pages

Today we refer to our phones as cellphones or mobile phones. However, that was not the case when they first came about. The term “radiotelephony” was used to describe what we now call our cell phones. Early radiotelephony, “early” dating back to the 1940’s, services was available for a very small amount of people. The very first mobile phones were better known as radiotelephones and were first used in the early part of the last century. Radiotelephones were originally used for ship-to-shore or ship-to-ship communications.
“Inventor and entrepreneur Guglielmo Marconi, is credited with developing the first successful wireless telegraph.” Even though Marconi, is credited for developing the first successful wireless telegraph, it could only transmit the dots and dashes of Morse code. “In 1901, Marconi placed a radio aboard a steam-powered truck, in effect creating the first land based wireless mobile data network. “However, the first successful wireless transmission of human dialogue took place on Christmas Eve 1906.” Credit for this successful wireless transmission goes to Reginald Fessenden. He used a radio to transmit music and verbal communication to ships at sea in the Atlantic. When the 1920s rolled around mobile radio systems in the United States were operating at 2MHz. These systems were mostly used by law enforcement agencies for dispatching. Then, just shortly after World War II happened in 1946, several of the first mobile radiotelephone systems popped up in the United States.
Known as Mobile Telephone Systems, these services provided interconnection with the public switched telephone network. Since the mobile telephone system networks were in an early stage, they were afflicted with natural problems. One of the problems was due to lack of available radio spectrum and technology at the time. A big disadvantage with the early system was that it required a large amount of bandwidth to send and receive signals. This meant that they needed a lot of spectrum to offer a small quantity of communication channels. To add on to the spectrum shortage, another problem came about for early mobile telephone system users. The problem was that the very early systems need the involvement of a human operator when placing outgoing calls.
With this system you could not place calls like we do today by just simply dialing them. Just to place a call you first had to contact the operator and give them the number of the person you wanted to contact. Then once the operator had the number they placed the call to make the connection. If it had not been for the operators no phone calls would have been placed. The operators served as a connection between the two networks. Despite the fact that you had to go through an operator just to talk to another person, the phones also operated in half duplex mode. Half duplex mode is where conversations had to take place using a push-to-talk procedure. In order for this to happen the customer would have to push a button...

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