Written for students and managers who do not have a technical background, Data Communications and Network Security comprehensively introduces students to the technology and management of data communications. This includes both wired and wireless technology as well as comprehensive coverage of network security, helping both the organization and the individual create and maintain a data-safe environment. The book's unique organization allows the material to be presented in a variety of ways, making the book a strong match to any teaching approach.Table of contentsPart I: The Basics of Communications1. Basics of Communications Technology2. Media and Their Applications3. Architecture, Models, and StandardsPart II: Network Basics4. Building a Network: Topology and Protocols5. Network Form and FunctionPart III: Wide-Area Networks: The Internet6. From LANs to WANs: Broadband Technology7. The Internet, Intranets, and Extranets8. Internet ApplicationsPart IV: Wireless Networks9. Wireless... Show
Presentation on theme: "Electronic Communications Electronic communications describes a process in which two or more computers or devices transfer data, instruction, and information."— Presentation transcript:1 2
Electronic Communications 3 Electronic communications describes a process in which two or more computers or devices transfer data, instruction, and information. Today, even the smallest computers and devices communicate directly with one
another, with hundreds of computers on a company network, or with millions of other computers around the globe. The Internet provides a means for worldwide communications. 4 Some communications involve cables and wires; others communicate wirelessly sending
signals through the air. A communications systems contain all types of computers and computing devices. 5 Communications
System Mainframe Server GPS Notebook Tablet PC Smart Phone Web Enabled PDA Set-Top Boxes Desktop The communications channel consists of telephone lines, cable television and other underground lines, microwave stations, and satellites. Satellite Microwave Stations Telephone lines, cable television and other underground lines
6 Successful communications needs: A sending device that initiates (begins) an instruction to transmit data, instructions, or information Sender
7 A communications device that connects the sending device to a communications channel (in this case a modem) Communications device Successful communications needs:
8 A communications channel, such as a telephone line, following the rules defined by the protocol being used so that each computer can understand the message on which the data,
instruction or information travels. Communications channel Successful communications needs: 9 Successful Communications needs: A communications device that connects a communications channel to the receiving
device (in this case a modem) Communications device 10 Successful Communications needs: A receiving device that accepts the transmission of data, instructions, or information Receiver
11 Data, instructions, and information travel along a communications channel in either analog or digital form, depending on the type of communications channel. Two examples of communications channels are cable television and telephone
lines. Cable television lines use digital signals, while some telephone lines use analog signals. An analog signal consists of a continuous electrical wave. A digital signal consists of individual electrical pulses that represent bits grouped together into bytes 12 All Digital Cable Digital Representation
13 Digital to Analog Phone Line Analog Representation Digital Representation 14
15 How does email get from one computer to another? Step 1: The sending device requests information using either physical transmission media or wireless transmission media Step 2: When the request leaves the ISP, it travels over T1 lines, microwave stations, earth- based stations, and communications satellites until it reaches the Internet
backbone Step 3: The request travels over T3 lines along the Internet backbone Step 4: The request travels over T1 lines until it reaches the destination network server 16 And How Long Does it Take? Less than a second! 17 Assignment Read the cartoon below and write a story about what is happening in the pictures. Each box should be a sentence. Use the knowledge learned from the presentation to write the sentences.
Computer communications describe a process in which two or more computers or devices transfer data, instructions and information. Even the smallest computers and devices can communicate directly with one another, often via the Internet. An input device is any hardware component that allows users to enter data and instructions into a computer. Was this answer helpful? What is data transmission? Data transmission refers to the process of transferring data between two or more digital devices. Data is transmitted from one device to another in analog or digital format. Basically, data transmission enables devices or components within devices to speak to each other. A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device. One type of communications device that connects a communications channel to a sending or receiving device such as a com- puter is a modem. What is a process in which two or more computers or devices transfer data instructions and information over a transmission medium?Computer communications describe a process in which two or more computers or devices transfer data, instructions and information. Even the smallest computers and devices can communicate directly with one another, often via the Internet.
What is transmit data and information in one computer to another?Data transmission is the transfer of data from one digital device to another. This transfer occurs via point-to-point data streams or channels. These channels may previously have been in the form of copper wires but are now much more likely to be part of a wireless network.
What type of device is used to transmitting data instructions and information between a sending device and a receiving device?A communications device is any type of hardware capable of transmitting data, instructions, and information between a sending device and a receiving device. One type of communications device that connects a communications channel to a sending or receiving device such as a com- puter is a modem.
What is the term for a communications device that connects multiple computers together and transmits data to its correct destination on a network?Router. Connects multiple computers or other routers together and transmits data to its correct destination on a network.
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The process in which two or more computers or devices transfer data, instructions, and information.
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