Data Communications refers to the transmission of digital data between two or more computers. A computer network or data network is a telecommunications network that allows computers to exchange data. The physical connection between networked computing devices is established using either cables media or wireless media. The best-known computer network is the Internet.
Data Communications are said to be local if communicating devices are in the same building or in a similarly restricted geographical area.
A Data Communication system can collect data from remote locations through data transmission circuits, and then output processed results to remote locations. The different data communication techniques which are presently in widespread use, evolved gradually, either to improve the data communications techniques already existing or to replace the same with better options and features. It enables the movement of electronic or digital data between two or more nodes, regardless of geographical location, technological medium or data contents, emails and instant messages, as well as phone calls are examples of data communications.
Communication is the process of sharing a message. A conversation between two people is an example of communication.
The performance of a Data Communications system depends on four fundamental characteristics:
1. Delivery: The data must be delivered in the correct order to the correct destination.
2. Accuracy: The data must be delivered accurately.
3. Timeliness: The Delivered data must be timely because data delivered late is useless.
4. Jitter: It is the uneven delay in the packet arrival time that causes uneven quality.
A Data Communication system has the following features:
1. Message: It is the information or data to be transmitted. It is made up of text, numbers, pictures, sound video, or any combination of these.
2. Sender: It is the device or computer that develops and sends that message.
3. Receiver: It is the device or computer that receives the message. The location of the receiving computer is generally different from the sender's computer. The distance between the sender and receiver depends upon the type of network used in between.
4. Medium: It is the channel or physical path in which the message is carried from the sender to the receiver.
5. Protocol: It is a set of rules that govern the communication between the devices. Both the sender and receiver follow the same protocols to communicate with each other.
A protocol performs the following functions:
1. Data Sequencing: It refers to splitting a long message into smaller packets of fixed size. Data sequencing rules define the method of numbering packets to detect loss or duplication of packets and to correctly identify packets, which belong to the same message.
2. Data Routing: Data routing defines the most efficient path linking the source and destination.
3. Data Formatting: Data formatting rules define which group of bits or characters within the packet constitute data, control, addressing, or other information.
4. Flow Control: A communication protocol also prevents a fast sender from overwhelming a slow receiver. It ensures resource sharing and protection against traffic congestion by regulating the flow of data on communication lines.
5. Error Control: These rules are designed to detect errors in messages and to ensure the transmission of correct messages.
6. Precedence and Order of Transmission: These rules ensure that all the nodes get a chance to use the communication lines and other resources of the network based on the priorities assigned to them.
7. Connection Establishment and Termination: These rules define how connections are established, maintained and terminated when two nodes of a network want to communicate with each other.
8. Data Security: Providing data security and privacy is also built into most communication software packages. It prevents access to data by unauthorized users.
9. Log Information: Several communication software is designed to develop log information, which consists of all jobs and data communications tasks that have taken place.
There are many benefits of data communications some of them are:
Data communication allows us to relay information between two or more devices.
Data communications makes the world a global village, which means that we are all connected to each other.
Data communications make it easy for us to carry out mundane tasks that were hard to do before easily like messaging someone over a distance.
This course will teach you about Data Communication and Computer Network (DCN) and will also take you through various concepts in Data Communication and Computer Network.
Data Comm & Networks Home
DCN - Overview
DCN - Computer Network Types
DCN - Network LAN Technologies
DCN - Computer Network Topologies
DCN - Computer Network Models
DCN - Computer Network Security
DCN - Physical Layer Introduction
DCN - Digital Transmission
DCN - Analog Transmission
DCN - Transmission media
DCN - Wireless Transmission
DCN - Multiplexing
DCN - Network Switching
Data Link Layer
DCN - Data Link Layer Introduction
DCN - Error detection and Correction
DCN - Data Link Control & Protocols
DCN - Network Layer Introduction
DCN - Network Addressing
DCN - Routing
DCN - Internetworking
DCN - Network Layer Protocols
DCN - Transport Layer Introduction
DCN - Transmission Control Protocol
DCN - User Datagram Protocol
DCN - Application Layer Introduction
DCN - Client-Server Model
DCN - Application Protocols
DCN - Network Services
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