History of Data Communication, Standards Organizations for Data Communication

DATA COMMUNICATION:

HISTORY OF DATA COMMUNICATION, STANDARDS ORGANIZATIONS FOR DATA COMMUNICATION.

Data communication can be defined as two personal computers connected through a Public Telecommunication Network (PTN). Point to point communication is the link between two stations A and B ie)., information is transferred between a main frame computer and a remote computer terminal.

A multipoint line configuration is one in which more than two specific devices share a single link. Morse code is used to send messages. A key which turned the carrier of a transmitter ON and OFF to produce the dots and dashes. These dots and dashes were detected at the receiver and it is converter back into letters and numbers makes the original message.

Forward Error Correction (FEC)

FEC, a receiver can use an error correcting code, which automatically correct certain errors without any retransmissions

In FEC, bits are added to the message before the transmission

Purpose of FEC code is to reduce the wasted time of retransmission

Data Communications History

•      1838:   Samuel   Morse   &   AlfredystemVeil   Invent

•      1876:   Alexander   Graham   Bell   invented   Tel

•      1910:Howard   Krum   developed   Start/Stop   Sy

History of Computing

• 1930: Development of ASCII Transmission Code

• 1945: Allied Governments develop the First Large Computer

• 1950: IBM releases its first computer IBM 710

• 1960: IBM releases the First Commercial Computer IBM 360

Main Contributors of Data Comm.

•      Transmission   Technology

•      Packet   Switching   Technology

•      Internet–1967:ARPANET by Advanced Research Project Agency (ARPA) of U.S.

–1975: TCP/IP protocol

•      LAN   Technology

–DIX-Ethernet & IEEE 802 Networks

•      WAN–1976: ISO releases HDLC & CCITT releases X.25 (PSPDN)

The Applications Of Data Communication:

·     Used in Automatic Teller Machine (ATM) Internet

·     Airline and Hotel reservation system

·     Mass media

·     NEWS network

Advantages And Disadvantages Of Parallel Communication:

Advantages:

Parallel transmission is speed

Used for short distance communication

Disadvantages:

Require more lines between source and destination

More cost