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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
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FAQs on PPT: Introduction to Data Communications - Computer Networks - Computer Science Engineering (CSE)

1. What is data communications?
Ans. Data communications refers to the process of transmitting and receiving data or information from one point to another using telecommunication or computer networks. It involves the exchange of data through various mediums such as cables, wireless connections, or optical fibers.
2. How does data communication work?
Ans. Data communication works by converting data into signals that can be transmitted over a network. The data is first encoded into binary code (0s and 1s) and then transmitted as electrical or optical signals. These signals are received by the destination device, which decodes them back into the original data.
3. What are the different types of data communication networks?
Ans. There are several types of data communication networks, including: - Local Area Network (LAN): A LAN is a network that covers a small area, such as an office building or a school campus. - Wide Area Network (WAN): A WAN is a network that spans a large geographical area, such as multiple cities or countries. - Metropolitan Area Network (MAN): A MAN is a network that covers a larger area than a LAN but smaller than a WAN, typically within a city. - Wireless Network: A wireless network uses wireless signals to transmit data instead of cables or wires. - Internet: The internet is a global network of interconnected networks that allows for worldwide data communication.
4. What are the advantages of data communications?
Ans. Some advantages of data communications include: - Faster and more efficient communication: Data communications enable real-time information exchange, allowing for faster decision-making and collaboration. - Global connectivity: With data communications, people and businesses can easily connect and communicate with others around the world. - Cost-effective: Data communications can be more cost-effective compared to traditional communication methods like postal mail or phone calls. - Scalability: Data communication networks can be easily scaled up or down to accommodate the changing needs of an organization. - Accessibility: Data communications allow for remote access to information and services, making it convenient for users to access data from anywhere at any time.
5. What are the main challenges in data communications?
Ans. Some challenges in data communications include: - Bandwidth limitations: The capacity of data transmission is limited by the available bandwidth, which can cause delays or congestion in the network. - Security risks: Data communications can be vulnerable to security threats such as hacking, data breaches, or unauthorized access. - Network reliability: Network failures or disruptions can interrupt data communication and cause delays or loss of data. - Compatibility issues: Different devices or networks may use different protocols or technologies, making it challenging to ensure seamless data communication between them. - Data integrity and accuracy: Ensuring the integrity and accuracy of transmitted data is crucial, as errors or corruption can lead to misinformation or data loss.
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