Computer communication and networks
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Data communication involves the exchange of data between two devices via some transmission medium. There are five key components: the message being sent, the sender, the receiver, the transmission medium such as a wire or cable, and protocols which establish communication rules. Data can flow in simplex, half-duplex, or full-duplex mode. A network connects multiple devices called nodes and data is generated and shared between these nodes. Connections can be point-to-point between two nodes or multipoint between more than two nodes where the channel capacity is shared.
Computer communication and networks
- 1. COMPUTER COMMUNICATION AND NETWORKS Books: Data Communication, by William Stallings Data Communication and networking by Behrouz A. Forouzan 1
- 2. INTRODUCTION DATA COMMUNICATIONS: The term telecommunication means communication at a distance. The word data refers to information presented in whatever form is agreed upon by the parties creating and using the data. Data communications are the exchange of data between two devices via some form of transmission medium such as a wire cable. 2
- 3. DATA COMMUNICATION COMPONENTS Five components of data communication 3
- 4. 1. Message: The massage is the information (data) to be communicated for example. Text, number, pictures, Audio, Vedio etc. 2. Sender: The sender is the device that sends the data massage. 3.Reciever: The receiver is the device which receive the massage. 4.transmission medium: The transmission medium is the physical path by which a message travels from sender to reciever. 4
- 5. CONTINUE: 5.Protocols: A protocol is the set of rules that governs data communication. it represents an agreement between the communication devices. Without protocols two devices may be connected but not communication. 5
- 6. DATA FLOW: Data flow (simplex, half-duplex, and full-duplex) 6
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- 8. NETWORKS: A network is a set of devices (often referred to as nodes) connected by communication links. A node can be a computer, printer, or any other device capable of sending and/or receiving data generated by other nodes on the network. 8
- 9. TYPES OF CONNECTIONS: Point-to-Point: In telecommunications, a point-to-point connection refers to a communications connection between two nodes or endpoints. The entire capacity of the link is reserved for transmission between two devices. Communication link may be wire or microwave or satellite link. An example is a telephone call, in which one telephone is connected with one other, and what is said by one caller can only be heard by the other. 9
- 10. MULTIPOINTS A multipoint connection is a connection in which more than two terminals share one communications link. In multipoint environment the capacity of the channel is shared. if several devices can use the link simultaneously, then it is spatially share connection. If user take turns .it is timeshared connection. 10
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