Telecommunication 2
Computer and telephone networks inflict a gigantic impact on today's society. From letting you call John in Calgary to letting you make a withdraw at your friendly ATM machine they control the flow of information. But today's complicated and expensive networks did not start out big and complicated but rather as a wire and two terminals back in 1844. From these simple networks to the communication giants of today we will look at the evolution of the network and the basis on which it functions. 2.1. Dot Dot Dot Dash Dash Dash Dot Dot Dot The network is defined as a system of lines or structures that cross. In telecommunications this is a connection of peripherals together so that they can exchange information. The first such exchange of information was on May 24, 1844 when Samuel Morse sent the famous message "What hath God wrought" from the US Capitol in Washington D.C. across a 37 mile wire to Baltimore using the telegraph. The telegraph is basically an electromagnet connected to a battery via a switch. When the switch is down the current flows from the battery through the key, down the wire, and into the sounder at the other end of the line. By itself the tel
which have changed the way people communicate with each other. The WWW can be 2.4. The Free Press Reported That President Carter....... similar, but run in a different way. Newsgroups basically create a forum where people can thetelephone without normal long distance calling charges. Also,with the new video cameras particular newsgroup, and others may respond to such notes. Again, this can be advertising, services can be found on the WWW. File transfers between networks can also be accomplished The first practical computers used the means of punched cards as a method of storing data. These punched cards held 80 characters each. They dated back to the mechanical vote-counting machine invented by Hermen Hollerith in 1890. But this type of computer was very hard and expensive to operate. They were very slow in computing speed and the punch cards could be very easily lost or destroyed. One of the first VDTs (Video Display Terminal) was the Lear-Siegler ADM-3A. It could display 24 lines of 80 characters each (a remarkable feat of technology). French inventor Emile Baudot created the first efficient printing telegraph. The printing telegraph was the first to use a typewriter like keyboard and allowed eight users to use the same line. More importantly, his machines did not use Morse code. Baudot's five level code sent five pulses for each character transmitted. The machines did the encoding and decoding, eliminating the need for operators. After some improvements by Donald Murray the rights to the machine were sold to Western Union and Western Electric. The machine was named the teletypewriter and was also known by it's nickname TTY. A service called telex was offered by Western Union. It allowed subscribers to exchange typed messages with one another.
Some common words found in the essay are:
I- Phone, Transfer Protocol, Western Union, LAN LAN, AT&T's Bell, Lear-Siegler ADM-3A, Send Sysop, Knot Various, Systems OS, USENET Newsgroups, western union, people communicate, changed people communicate, morse code, fiber optic, dot dot, token ring, bell 103, human interaction, video cameras, changed people, hundreds thousands pieces, send hundreds thousands, thousands pieces e-mail, pieces e-mail internet,
Approximate Word count = 5038
Approximate Pages = 20 (250 words per page double spaced)
|
