A Review on Li-Fi: The Next Generation Wi-Fi

The Li-Fi stands for Light Fidelity. The technology is very new and was proposed by the German physicist Harald Haas in 2011 TED (Technology, Entertainment, Design) Global Talk on Visible Light Communication (VLC). Light Fidelity (LiFi) is a Visible Light Communication (VLC) based technology that making a light as a media of communication replacing the cable wire communication. LiFi is evolved to overcome the rate speed in Wi-Fi, while using LiFi the rate speed can reach until 14 Gbps. This paper includes an introduction of the LiFi technology including the architecture, working, performance, and the challenges Li-Fi, its applications, features and comparison with existing technologies like Wi-Fi etc. Wi-Fi is of major use for general wireless coverage within building, whereas Li-Fi is ideal for high density wireless data coverage in confined area and especially useful for applications in areas where radio interference issues are of concern, so the two technologies can be considered complimentary. Keywords: LED, Li-Fi Technology, Wi-Fi Technology, Data Transmission, Visible Light, Li-Fi Applications

Security enabled parallel connection for intercom

The paper is intended to keep up security amongst 4 parallel telephones associated with a solitary telephone cable wire. The proposed system provide near independent line like performance for the set of 4 intercoms line. At the point when two or more telephone is associated with a solitary telephone wire line, anybody can pick up telephone to attend the discussion on other end. The projected framework gives an answer for security amongst the telephones associated. So as to meet the prerequisite we are utilizing four phones associated as a part of parallel throughout solitary phone cable line with every phone associated through communicate a transfer in the framework. At the point when any of phone is picked up every single other telephone are disengaged by the transfers through a configuration plan of opt couplers, the consequence of that is provided to a code able Arduino. The Arduino drives signal to a seven segment demonstration to show which phone is picked up, whereas different phones are disengaged by particular transfers with assist of Relay-Driver Integrated Circuit connected to Arduino. The system can be utilized in home and workplaces there two or more phone is associated in parallel throughout a solitary phone line wire. The venture is reasonable for both approaching and going outward calls. Facilitate the venture can be upgraded by including more numeral of telephones with intercom service. An approaching caller ID service can likewise add further to this.