Wireless Network

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Present by: Dayer Gonzalez and Ivan Davila

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Wireless Network

  1. 1. Present by : Dayer González Iván Davila
  2. 2. <ul><li>Wireless networks (wireless network in English) are those that communicate via a transmission medium unguided (wireless) using electromagnetic waves. The transmission and reception is performed through antennas. Have advantages such as quick installation of the network without the need for wiring, allowing the mobility and less maintenance costs than a conventional network. </li></ul>
  3. 3. <ul><li>WPAN (Wireless Personal Area Network) : </li></ul><ul><li>In this type of personal network coverage, there are technologies based on HomeRF (standard for connecting all mobile phones and home computers through a central device), Bluetooth (protocol that follows the IEEE 802.15.1), ZigBee (based in the IEEE 802.15.4 specification and used in applications such as home automation, that require secure communications with low rates of data transmission and maximizing the lifespan of their batteries, low power consumption), RFID (remote storage and retrieval of data for the purpose of conveying the identity of an object (like a unique serial number) via radio waves. </li></ul><ul><li>WLAN ( Wireless Local Area Network) : </li></ul><ul><li>In this type of personal network coverage, there are technologies based on HomeRF (standard for connecting all mobile phones and home computers through a central device), Bluetooth (protocol that follows the IEEE 802.15.1), ZigBee (based in the IEEE 802.15.4 specification and used in applications such as home automation, that require secure communications with low rates of data transmission and maximizing the lifespan of their batteries, low power consumption), RFID (remote storage and retrieval of data for the purpose of conveying the identity of an object (like a unique serial number) by radio waves. </li></ul>
  4. 4. <ul><li>WMAN (Wireless Metropolitan Area Network, Wireless MAN) : </li></ul><ul><li>For metropolitan area networks are based technology WiMax (Worldwide Interoperability for Microwave Access, is, World Interoperability for Microwave Access), a wireless communication standard based on IEEE 802.16WiMax is a protocol similar to Wi-Fi but with more coverage and bandwidth. We can also find other communication systems such as LMDS (Local Multipoint Distribution Service). </li></ul><ul><li>WWAN (Wireless Wide Area Network, Wireless WAN) : In these networks are technologies such as UMTS (Universal Mobile Telecommunications System), used with mobile phones of third generation (3G) and successor to the GSM (2G mobile) or digital technology to mobile GPRS (General Packet Radio Service ). </li></ul>
  5. 5. <ul><li>Bluetooth : Is a standard that uses FHSS, capable of transmitting at speeds of 1 Mbps and is supported by over 2000 company’s technology .Bluetooth has recently emerged as a possible substitute for any type of cable attached to a computer, due to its cost and supported by hundreds of companies. His speed (1 Mbps) will be able to replace conventional connections parallel and serial cables, as it is 3 to 6 times faster (respectively) that these connections in wide use on any computer. </li></ul><ul><li>Radio waves: </li></ul><ul><li>The electromagnetic waves are unidirectional, so it is not necessary dishes. The transmission is not sensitive to the attenuation caused by rain as it operates at frequencies not too high. In this range there are bands from ELF which range from 3 to 30 Hz, to the UHF band ranging from 300 to 3000 MHz, comprising radio spectrum from 30 - 3,000,000 Hz </li></ul>
  6. 6. <ul><li>Microwave terrestrial : </li></ul><ul><li>Dishes are used with a diameter of approximately three meters. Have coverage of miles, but with the disadvantage that the transmitter and receiver must be perfectly aligned. Therefore, we tend to use point to point links over short distances. In this case, the attenuation caused by rain is more important since it operates at a higher frequency. Include microwave frequencies from 1 to 300 GHz. </li></ul><ul><li>Microwave satellite : </li></ul><ul><li>Made between two or more ground stations are known as base stations. The satellite receives the signal (called the uplink) in a frequency band, amplifies and retransmits on another band (signal low). Each satellite operates in specific bands. The boundaries of the microwave frequency, both terrestrial and satellite, with the infrared and radio waves of high frequency is quite mixed, so there may be interference with communications at certain frequencies. </li></ul>
  7. 7. <ul><li>Wireless Flash Drive: The Wireless USB Adapter connects your desktop or laptop to your wireless network. With a wireless router as a central connection point for your network, your computers can share files, printers, and disks quickly and reliably, using a modem and DSL, will have access to broadband Internet. The users of desktops can join the network through the convenience of a USB connector, without opening the casing of the PC. Users of laptops benefit from power while continuing to move online. </li></ul>
  8. 8. <ul><li>Wireless Network Interface Card: </li></ul><ul><li>A wireless network interface controller (WNIC) is a network card which connects to a radio-based computer network, unlike a regular network interface controller (NIC) which connects to a wire-based network such as token ring or ethernet. A WNIC, just like a NIC, works on the Layer 1 and Layer 2 of the OSI Model. A WNIC is an essential component for wireless desktop computer. This card uses an antenna to communicate through microwaves. A WNIC in a desktop computer usually is connected using the PCI bus. Other connectivity options are USB and PC card. Integrated WNIC's are also available, (typically in Mini PCI/PCI Express Mini Card form). </li></ul>

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