History Of Data Communication Flashcards
the transfer of data or information between a source and a receiver. The source transmits the data and the receiver receives it.
Data communication
information that is stored in digital form
Data
is defined as knowledge or intelligence
Information
is a set of devices interconnected by media links
Network
a global computer network providing a variety of information and communication facilities, consisting of interconnected networks using standardized communication protocols
Internet
A proposal was submitted to a Scottish magazine suggested running a communications line between villages comprised of 26 parallel wires, each wire for one letter of the alphabet.
1753
Who developed an unusual system based on a five-by-five matrix representing 25 letters (I and J were combined).
Carl Friedrich Gauss
In what year Gauss developed an unusual system based on a five-by-five matrix representing 25 letters (I and J were combined).
1833
invented the first successful and practical data communications system which he called the Telegraph.
Samuel F.B Morse
Samuel F.B. Morse invented the first successful and practical data communications system which he called the Telegraph.
1832
Morse also developed the first practical data communications code which we all know as the
Morse Code
Morse secured an American patent for his telegraph.
1840
The first telegraph line was established between Baltimore and Washington D.C? And in what Year?
“What hath God wrought!” , 1844
the first slow-speed telegraph printer was invented
1849
the first high-speed (15-bps) printers were available.
1860
invented a telegraph multiplexer which allowed signals up to six different telegraph machines to be transmitted simultaneously over a single wire.
Emile Baudot (1874)
invented the telephone?
Alexander Graham Bell (1876)
succeeded in sending radio telegraph messages.
Guglielmo Marconi (1899)
First commercial radio stations were installed, allowing the transmission of information across large spans of water.
1920
Bell Laboratories developed the first special-purpose computer using eletromechanical relay.
1940
The UNIVAC was the first mass produced electronic computer, built by the Remington Rand Corporation
1951
batch processing systems were replaced by on-line processing systems.
1960s
microprocessor-controlled microcomputers were introduced.
1970s
Personal computers became an essential item.
1980s
The AT&T operating tariff allowed only equipment furnished by AT&T to be connected to AT&T lines.
1968
Internet began to evolve at the ARPA.
1969
ARPANET was formed to connect sites around the US.
1970
The World Wide Web became publicly available
1991
3 major developments
- Large-scale integration of circuits reduced cost and size of terminals and communication equipment
- New software systems that facilitated the development of data communication networks
- Competition among providers of transmission facilities reduced the cost of data circuits
When we communicate , we share information . Information can be?
Local or Remote
communication occurs face to face
Local
communication occurs over a long distance
Remote
is any system of computers used to transmit and/or receive information between two or more locations.
Data Communication Network
a set of equipment, transmission media, and procedures that ensures that a specific sequence of events occurs in a network in the proper order to produce the intended results.
Network Architecture
include the most modern and sophisticated networks and protocols available.
Current networks
A network or a protocol becomes a legacy when no one really wants to use it, but for some reason it just won’t go away. It is the generic name assigned to any old network, which is rarely used today and not part of the TCP/IP protocol suite. Legacy networks are mostly proprietary to individual vendors.
Legacy Networks
when an antiquated network or protocol finally disappears
Legendary Networks
All stations and devices on the network share a single communication channel.
Broadcast Network
It only has two stations. No addresses are needed. All transmissions Intended for and received by the other station.
Point-to-point Network
are sets of rules governing the orderly exchange of data within the network or a portion of the network. Can either be Connection Oriented or Connectionless.
Data communication protocols
refers to the structure or format of the data within the message, which includes sequence in which the data are sent.
Syntax
refers to the meaning of each section of data.
Semantics
are guidelines that have been generally accepted by the data communication industry. (Proprietary or Open)
Data communications standards
