Month: July 2021

Infrared Waves Infrared waves, with frequencies from 300 GHz to 400 THz, can be used for short-range communication. Infrared waves, having high frequencies, cannot penetrate walls. This advantageous characteristic prevents interference between one system and another, a short-range communication system Read More …

UNBOUNDED OR UNGUIDED TRANSMISSION MEDIA Unguided medium transport electromagnetic waves without using a physical conductor. This type of communication is often referred to as wireless communication. Signals are normally broadcast through free space and thus are available to anyone who Read More …

TRANSMISSION MEDIUMS IN COMPUTER NETWORKS Data is represented by computers and other telecommunication devices using signals. Signals are transmitted in the form of electromagnetic energy from one device to another. Electromagnetic signals travel through vacuum, air or other transmission mediums Read More …

Computer Networking -Wireless Networks                                                                          Read More …

TYPES OF COMMUNICATION NETWORKS Communication Networks can be of following 5 types: 1. Local Area Network (LAN) 2. Metropolitan Area Network (MAN) 3. Wide Area Network (WAN) 4. Wireless 5. Inter Network (Internet) Local Area Network (LAN) It is also Read More …

INTRODUCTION TO COMPUTER NETWORKS A set of devices often mentioned as nodes connected by media link is called a Network. A node can be a device which is capable of sending or receiving data generated by other nodes on the Read More …

Terms used in Data communication A. Data Signal Analog signal is one type of continuous time-varying signals, and these are classified into composite and simple signals. A simple type of analog signal is nothing but a sine wave, and that Read More …

PRINCIPLE OF DATA COMMUNICATION AND COMPUTER NETWORKS DATA COMMUNICATION Refers to a process of transmitting data signals form one point through the network. Basic Communication Model A Communication model is used to exchange data between two parties. For example: communication Read More …

SYSTEM DOCUMETATION System documentation is information about built solution and acts as a reference for future maintenance or update efforts. A description of a program after it has been developed. It is organized based on system functionality rather than when Read More …

Maintenance and review The process of monitoring, evaluating, and modifying of existing information systems to make required or desirable improvements may be termed as System Maintenance. System maintenance is an ongoing activity, which covers a wide variety of activities, including Read More …