Wireless devices by hm

What is Wireless devices?Defination:

A device which is use to transfer of information between two or more points that are not connected by an electrical conductor.

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Example of Wireless Devices

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Wireless comes of Age

• Guglielmo Marconi invented the wireless telegraph in 1896Communication by encoding alphanumeric character in analog signal.

Sent telegraphic signals across the Atlantic Ocean.• Communication satellites launched in 1957.• Advances in wireless technology:Radio,television,mobile telephones,communication satellites• More recently: Satellite communication ,wireless networking,cellular technology

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Why Wireless?• Characteristics mostly radio transmission, new protocols for data

transmission are needed• Advantages Ad hoc networks without former planning No problems with wiring• Disadvantages Generally very low transmission rates for higher numbers of

users Restricted frequency range ,interferences of frequencies

Photophone• The world's first wireless telephone .• Photophone is also called Radiophone.• Alexander Graham Bell and Charles Sumner

Tainter invented the photophone.• The photophone is

a telecommunications device which allowed for the transmission of speech on a beam of light

• Audio conversations wirelessly over modulated light beams.

• Photophone was a precursor to the fiber-optic communication systems which achieved worldwide popular usage starting in the 1980s.

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Radio• The Radio is type of Wireless Transmission.• Wireless Media that transfer data by carrying

Electromagnetic waves with Low frequencies to distant locations through an Electrical conductor and an Antenna.

• The Transmission frequency for information transmitted through a Radio System range from 10KHz to 1 GHz and the frequencies are regulated by the Fedral communication commission (FCC).

• Now, Radio is used to describe modern Wireless communication such as Cellular Networks and Wireless Broadband Internet. IT Legends

Satellite

• Satellite communication is one of the Wireless technologies

• Widely spread all over the world.• Communicates directly with orbiting

satellite via Radio signals.• Portable satellite phones and Modems

have more powerful Broadcasting abilities than the cellular Devices.

• e.g. for outlifting the ship through satellite communication, a traditional communication

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Boardband Wireless Technology

• provides high-speed wireless Internet access or computer networking access over a wide area.

• Higher data rate obtainable with broadband wireless technology

e.g. Graphics,video,audio• advantages of all wireless service: Convenience and reduce cost Services can be developed faster than fixed

services No cost of cable plant service Service is mobile ,deployed almost anywhere.

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Wireless Ad hoc Networks

•  also known as IBSS - Independent Basic Service Set.

• Wireless Ad hoc networks is a specific type of wireless networks when no infrastructure exists.

• Multi Ad hoc networks: Sensor networks Routing Security Applications

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LTE• LTE stand for Long Term Evolution• Standard for wireless

communication of High speed data for mobiles phones.

• Based on GSM/EDGE and UMTS\HSPA network technologies.

• Natural upgrade path for carriers with both network technologies

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Wi-Fi• Local area wireless computer networking • Allows electronic devices to connect to tha network• Wi-Fi Alliance defines WiFi as “Wireless local area

networks”• Term Wi-Fi is used as synonym for “WLAN”• Trademark of Wi-Fi Alliance• Devices that used WiFi are PC’s, video game

console, Smart phones,Dijital cameras , Tablets and Dijital audio players

• Hotspot Wi-FiIT Legends

Infrared (IR)• Infrared is a media transmission system that

transmits data signals through LEDs or Lasers.• Infrared is a Electromagnetic Energy having

Longer wavelength than Red Light.• Information cannot be travelled through

Obstacles in a infrared system but can be inhibited by light.

• One type of infrared is the point to point system in which transmission possible between two points limited to a range and line of sight

• The signal frequency to transmit in a point to point system 100GHz to 1000THz and the speed ranges from 100Kbps to 16Mbps.

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Infrared Based DevicesThermographic camera Infrared countermeasureConsumer IR Infrared blasterPassive infrared sensorBose SoundDock

Thermographic camera• Is also called infrared camera or thermal

imaging camera.• Device that forms an image using infrared

radiation, similar to a common camera that forms an image using visible light.

• In 1929, First thermographic camera invented  infrared-sensitive (night vision) electronic television camera for anti-aircraft defense in Britain.

•  have a single color channel ,  does not distinguish different wavelengths of infrared radiation. IT Legends

Infrared countermeasure•  designed to protect aircraft from infrared homing missiles by confusing the

missiles' infrared guidance system so that they will miss their target.

Consumer IR• wide variety of devices employing the infrared electromagnetic

spectrum for wireless communications.• Most commonly found in television remote controls

Infrared blasters•  emulates an infrared remote control to autonomously control a device that is

normally controlled only by remote control key presses.• Most common use in recording devices such as DVR or VCR to change the channel

on an external tuner.•  Another common use is to extend infrared signals in order to place remote

controlled products behind closed doors.IT Legends

Bluetooth Technology

• A Bluetooth device uses Radio waves instead of wires or cables to connect to a phone or computer.

• .Bluetooth is an open specification for wireless communication and networking

Personal computersMobile phonesOther wireless devices

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Wireless USB• Short range ,high bandwidth • Based on ultra-wideband(UWB)

common radio platform.• Capable of sending 480 Mbits\s at

distance upto 3 metres(9.8 ft) and 110 Mbits\s at upto 10 metres(33 ft).

•  Wireless USB is based on the Ultra-WideBand (UWB) platform, which operates in the 3.1 to 10.6 GHz frequency range,

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Wireless Phones• Many different users communicate

across a single frequency band through cellular and cordless phones .

• Cellular and cordless phones are two more examples of devices that make use of wireless signals.

• Some phones make use of signals from satellites to communicate similar to global positioning system(GPS) devices.

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Wireless Adapters

• Wireless adapters are hardware devices that are installed inside computers which enables wireless connectivity.

• If a computer does not have a wireless adapter, it will not be able to connect to a router in order to access the internet.

• Some computers have wireless adapters built directly into the motherboard, while it is also possible to install stand-alone wireless adapters to add wireless capability to a computer that does not have a built-in facility.

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Wireless Repeater

• A Wireless repeater is a wireless networking device that is used to extend the range of wireless router.

• A Repeater receives wireless signals and amplifies the strength of the signals, and then re-emits .

• The strength of the signal can be increased by placing a repeater between the router and the computer connected to the router.

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Cordless Computer Peripherals

• Two types of cordless peripheralsi.  Infrared (IR) based on optical principle

ii.  radio frequency (RF) based on wave principle.• IR is cheaper, has less interference. But requires direct optical

contact between peripherals and receiver.• Some devices as shown below:

i. Wireless keyboards ii. Remote controls

iii. Wireless printers

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Wireless keyboard • allows the user to communicate with

computers, tablets, or laptops with the help of radio frequency (RF), infrared (IR) or Bluetooth technology.

• In case of RF, it’s communication range about 27 MHz to 2.4 GHz.

• Infrared based keyboards use light waves to transmit signals to other infrared enabled devices.

• Most wireless keyboards works on 2.4 GHz RF.

• Today’s Widely used BT based keyboards.

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Remote Control

• Remote control is a component of an electronic device such as a television set, DVD player, or other home appliance, used to operate the device wirelessly from a short distance.

• Commonly, remote controls are Consumer IR devices which send digitally-coded pulses of infrared radiation to control functions such as power, volume, tuning, temperature set point, fan speed, or other features.

• Remote controls for these devices are usually small wireless handheld objects with an array of buttons for adjusting various settings such as television channel, track number, and volume.

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• Earlier remote controls in 1973 used ultrasonic tones. The remote control code, and thus the required remote control device, is usually specific to a product line, but there are universal remotes, which emulate the remote control made for most major brand devices.

• Remote control has continually evolved and advanced over recent years to include Bluetooth connectivity, motion sensor-enabled capabilities and voice control.

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Wireless Printers• There are several printers on market that have WiFi

transceivers built into them.• Network administrators must first comes install the

printer to the network so that other devices connected to the system can locate the printer.

• Once connected, compatible devices can send print jobs to the printer.

• This comes handle for offices or households with lots of computers.

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