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INTRODUCTION TO WIRELESS NETWORK AND ITS EXPLANATION
- 1. Wireless Networks A wireless network is any type of computer network that uses wireless data connections for connecting network nodes. A wireless network is similar to a wired network, but instead of using cables, it communicates using radio frequency signals. Divided into 3 main categories: system interconnection Wireless LANs Wireless WANs
- 2. System interconnection means interconnecting the components of a computer using short-range radio. Example: short range wireless n/w bluetooth. Allows digital cameras, headsets, scanner & other devices to connect to a computer by merely being brought within range. No cables, no driver installation, just put them down, turn them on & they work . System interconnection n/w use the master-slave paradigm. System unit is normally the master, talking to the mouse, keyboard, etc., as slaves
- 4. Wireless Local Area Networks Wireless and wired LANs. (a) 802.11. (b) Switched Ethernet.
- 5. Master tells the slaves what addresses to use, when they can broadcast, how long they can transmit, what frequencies they can use, & so on. WIRELESS LANs These are the systems in which every computer has a radio modem & antenna with which it can communicate with other systems. WLANs are becoming common in small offices & homes (installing Ethernet is considered too much trouble), older office buildings, company cafeterias, conference rooms, and other places. Standard for the WLANs is IEEE 802.11. Example: cellular telephones low-bandwidth wireless system. 3rd generations are there: first gen. – analog & for voice only second gen. – digital & for voice only third gen. – digital & is for both voice & data.
- 6. here distance involved are much greater & the bit rates much lower. WLANs can operate at rates up to 50 Mbps over a distances of tens of meters.(cellular n/w operates below 1 Mbps) WIRELESS WANs Used in wide area systems. High-speed wireless n/w Almost all wireless n/ws hook up to wired n/w at some pt. to provide access to files, databases, & the Internet.
- 7. Home Networks Idea: in future most homes will be set up for networking. Every device in the home will be capable of communicating with every other device, & all of them will be accessible over the Internet. Categories: computers (PC, notebook PC, shared Peripherals) entertainments (TV, DVD, VCR, CAMERA, MP3) telecommunications (telephone, mobile telephone, fax) appliances (microwave, refrigerators, lights) telemetry (utility meters, smoke/burglar alarm) Home computer n/w is already there.(limited) have a device to connect multiple computers to a fast Internet connection.
- 8. Home networking has some fundamentally different properties than other network types. First, the n/w & devices have to be easy to install. Second, the n/w & to be foolproof in operation. Third, low price is essential Fourth, the main application is likely to involve multimedia, so the n/w needs sufficient capacity. home n/w will require better performance than that of existing office n/ws & expand the reach of the n/w gradually. Fifth, it must be possible to start out with one or two devices & expand the reach of the n/w gradually. Sixth, security & reliability will important. Home networking offers many opportunities & challenges.
- 9. INTERNETWORKS Many n/ws exist in the world –with different hardware & software. People connected to one n/w often want to communicate with people attached to a different one. Fulfillment of this requires different, & frequently incompatible n/ws, be connected, sometimes by means of machines called gateways to make the connection & provide the necessary translation, both in terms of hardware & software. A collection of interconnected networks is called an internetwork or internet. A common form of internet is a collection of LANs connected by WAN.
- 10. Network Hardware Classification of interconnected processors by scale.