PPT: Introduction to Data Communications | Computer Networks - Computer Science Engineering (CSE) PDF Download

 Page 1


Introduction to Data
Communications
Page 2


Introduction to Data
Communications
What is data communication?
n Not to be confused with telecommunication—
– Any process that permits the passage from a
sender to one or more receivers of information of
any nature, delivered in any easy to use form by
any electromagnetic system.
n Data communication-
– Defined as a subset of telecommunication
involving the transmission of data to and from
computers and components of computer systems.
 More specifically data communication is transmitted via
mediums such as wires, coaxial cables, fiber optics, or
radiated electromagnetic waves such as broadcast radio,
infrared light, microwaves, and satellites.
Page 3


Introduction to Data
Communications
What is data communication?
n Not to be confused with telecommunication—
– Any process that permits the passage from a
sender to one or more receivers of information of
any nature, delivered in any easy to use form by
any electromagnetic system.
n Data communication-
– Defined as a subset of telecommunication
involving the transmission of data to and from
computers and components of computer systems.
 More specifically data communication is transmitted via
mediums such as wires, coaxial cables, fiber optics, or
radiated electromagnetic waves such as broadcast radio,
infrared light, microwaves, and satellites.
History of Telecommunications
n Invention of telegraph Samuel Morse –
1837
n Invention of telephone- Alexander
Graham Bell – 1876
n Development of wireless By ??? – 1896
n Concept of universal access and growth
of AT&T
n Divestiture of AT&T—what year??
Page 4


Introduction to Data
Communications
What is data communication?
n Not to be confused with telecommunication—
– Any process that permits the passage from a
sender to one or more receivers of information of
any nature, delivered in any easy to use form by
any electromagnetic system.
n Data communication-
– Defined as a subset of telecommunication
involving the transmission of data to and from
computers and components of computer systems.
 More specifically data communication is transmitted via
mediums such as wires, coaxial cables, fiber optics, or
radiated electromagnetic waves such as broadcast radio,
infrared light, microwaves, and satellites.
History of Telecommunications
n Invention of telegraph Samuel Morse –
1837
n Invention of telephone- Alexander
Graham Bell – 1876
n Development of wireless By ??? – 1896
n Concept of universal access and growth
of AT&T
n Divestiture of AT&T—what year??
History of Telecommunications
Continued….
n Telecommunications Act of 1996
n Three main developments that led to the
growth of data communications systems:
– Large-scale integration of circuits reduced the cost
and size of terminals and comm equipment
– Developments of software systems made
establishment of communication networks easy
– Competition among providers of transmission
facilities reduced the cost of data circuits
Page 5


Introduction to Data
Communications
What is data communication?
n Not to be confused with telecommunication—
– Any process that permits the passage from a
sender to one or more receivers of information of
any nature, delivered in any easy to use form by
any electromagnetic system.
n Data communication-
– Defined as a subset of telecommunication
involving the transmission of data to and from
computers and components of computer systems.
 More specifically data communication is transmitted via
mediums such as wires, coaxial cables, fiber optics, or
radiated electromagnetic waves such as broadcast radio,
infrared light, microwaves, and satellites.
History of Telecommunications
n Invention of telegraph Samuel Morse –
1837
n Invention of telephone- Alexander
Graham Bell – 1876
n Development of wireless By ??? – 1896
n Concept of universal access and growth
of AT&T
n Divestiture of AT&T—what year??
History of Telecommunications
Continued….
n Telecommunications Act of 1996
n Three main developments that led to the
growth of data communications systems:
– Large-scale integration of circuits reduced the cost
and size of terminals and comm equipment
– Developments of software systems made
establishment of communication networks easy
– Competition among providers of transmission
facilities reduced the cost of data circuits
History of Data Communication
n Transistor developed by Bell Labs (which is
now ???) 1947
n Hush-a-Phone Case
n Carterphone case
n MCI and Long Distance
n Creation of networks (LAN’s and WAN’s)
n Data Link Protocols
n Microcomputers