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INTRODUCTION
When the network is working properly, you should be able to use it withoutthinking about all of that internal plumbing—just click a few icons andyou’re connected. But when you’re designing and building a new network,or when you want to improve the performance of an existing network, it canbe essential to understand how all that data is supposed to move from oneplace to another. And when the network does something you aren’t expectingit to do, you will need a basic knowledge of the technology to do any kind ofuseful troubleshooting.
How Wireless Networks Work
Moving data through a wireless network involves three separate elements :the radio signals, the data format, and the network structure. Each of these elements is independent of the other two, so you must define all three when you invent a new network. In terms of the OSI reference model, theradio signal operates at the physical layer, and the data format controlsseveral of the higher layers.
The network structure includes the wirelessnetwork interface adapters and base stations that send and receive the radiosignals. In a wireless network, the network interface adapters in each computerand base station convert digital data to radio signals, which they transmit toother devices on the same network, and they receive and convert incoming radio signals from other network elements back to digital data.Each of the broadband wireless data services use a different combinationof radio signals, data formats, and network structure. We’ll describe each type of wireless data network in more detail later in this chapter, but first, it’s valuable to understand some general principles.
1.1 SYNOPSIS
This project is designed for wireless technology for displaying the message on the LCD display by using zigbee (wireless Communication). At the transmitting end we are using one Zigbee module to send the message. And at the consumer side we are using one Zigbee (serial) module to receive the message. We are using wireless enabled module to send the message from the transmitter. At the receiver side we are receiving that message by using Zigbee technology. The wireless module at the receiver side will receive that message and display on LCD.
1.2 SCOPE OF THE PROJECT
In this project we are using the latest wireless technologies for acquiring the data without any loss. The wireless technologies we used is ZIGBEE sensor network . So we utilize all possible features of these technologies for getting an error free and accurate data.
1.3 PROJECT FEATURES
 Low data rate
 Low power consumption
 Small packet devices
 Consumer electronics
 PC
 Personal and healthcare
 cheap and easy installation
 flexible and extendable networks
 integrated intelligence for network set-up and message routing
2 LITERATURE REVIEW
2.1 EXISTING SYSTEM
A large format communication display system designed and constructed for viewing from extended distances. In accordance with the present invention, using opto-electronic devices, full motion digital video images are projected from within a partially or totally enclosed conveyance on to wall mounted display screens designed for viewing outside a conveyance, while the conveyance is in motion or parked.
The general idea of this invention is to remove the barrier of no video or no motion images from mobile or transit displays. The self-contained or modular aspect of this invention allows complete portability and viewing while in transit or on site.
a force display system using parallel wire mechanism for virtual sports training with high speed motion.
We firstly point out a control issue of the force display system driven by parallel wire mechanism. Based on the analysis, control laws are proposed to improve performance of the force display system. It is experimentally demonstrated that the proposed control laws realize higher acceleration and lower reaction force than other force display systems. Using the experimental result, the performance of the system is evaluated quantitatively.
The present invention relates generally to an electronic display system and more particularly, to a database-driven electronic display system. The revolutionary invention of Multilanguage Self-Contained Unmanaged Database-Driven Real Time Digital Advertising Display System provides a fast and efficient way to advertise and promote products and services in any language for all kinds of retail companies by reaching out and targeting audience via display and, most importantly, dramatically saves time and money
For any company around the world. Retail Companies could utilize existing seasonal and weekly merchandise related promotional information from corporate databases like Oracle, Microsoft SQL or MySQL by displaying inside the stores or outside--as billboards. Multilanguage Self-Contained Unmanaged Database-Driven Real Time Digital Advertising Display System communicates via High Speed Internet Connection thus all updated information will be delivered in real time. Multilanguage Self-Contained Unmanaged Database-Driven Real Time Digital Advertising Display System communicates via Internet with DSL, T1/T3 Line, High Speed Internet Cable Modem, Wireless Broadband Network, Dial-up connection utilizing VPN (Virtual Private Network), SSH, SSL2/3 secure technology or can utilize forms of CD, DVD, Flash Memory, and Smart Card.
A display and an associated method of making the display are disclosed. The display is characterized by one or more partial carriers, each having mounted thereon a partial image, and arranged at predetermined locations and orientations such that they cooperatively define a desired transitory complete image design or logo when viewed by an observer passing by a predetermined viewing area relative to the display. Several embodiments are disclosed which achieve the desired result. One embodiment includes a fragmented arrangement of multiple partial image carriers where the partial image carriers may be constructed from two-dimensional flat plates or three-dimensional solid objects or a combination of both. Another embodiment utilizes partially transparent partial message carriers.