Wireless connections do not use a solid substance to connect sending and receiving devices. Rather, they use the air itself. Primary technologies used for wireless connections are infrared, radio frequency, microwave, and satellite.
Infrared uses infrared light waves to communicate over short distances. It is can only travel in a straight line. This requires that sending and receiving devices must be in clear view another without any indication blocking that view. One of the most common applications is to transfer data and information from a portable device such as a notebook computer or PDA to a desktop computer.
Radio frequency (RF) uses radio signals to communicate between wireless devices. For example, cellular telephone and many Internet-enable devices use RT to Place telephone calls and /or to connect to the Internet . Some end users connect their notebook or handheld computers to a cellular telephone to access the Web from remote location. Most home or business wireless network are based on a standard called wi-fi (wireless fidelity).
Bluetooth is a short-range radio communication standard that transmits data over short distances of up to approximately 33 feet. Bluetooth is widely used for wireless headsets, printer connections, and handheld device.
Microwave communication uses high - frequency radio waves. Like infrared, microwave communication provides line-of-sight communication because microwaves travel in a straight line. Because the waves bend with the curvature of the earth, they can be transmitted only over relatively short distances. Thus, microwave is a good medium for sending data between buildings in a city or on a large college campus. For longer distances, the microwave dishes or antennas. These stations. Any of these are offered by Intelsat, the International Telecommunications Satellite. Consortium, which is owned by 114. Government and form a worldwide communication system. Satellite rotate at a precise point and speed above the earth. They can amplify and relay microwave signals from one transmitter on the ground to another. Satellite can be used to send and receive large volumes of data. Uplink is a term relating to sending data to a satellite. Download refers to receiving data from a satellite. The major drawback to satellite communication is that bad weat weather can sometimes interrupt the flow of data
One of the most interesting application of satellite communication is for global positioning. A network of 24 satellites owned is and managed by the Defense Department continuously sends location information to earth. Global positioning system (GPS) device us3 that information to uniquely determine the geographical location of the device. Available in many automobile to provide navigational support, these systems are often mounted into the data with a monitor to display maps and speakers to provide spoken directions . Many of today's cell phones , including the Apple iPhone, use GPS technology for handheld cell phones, including the Apple iPhone, use GPS technology for handheld navigation
Advantage of Multimedia :
The use a Multimedia offers many advantages
1) Enhancement of text only messages: Multimedia enhances text only presentation by adding interesting sound and compelling visuals .
2) Improves oven Traditional Audio- Vidio presentations: Audiences are more attentive to multimedia messages than than traditional presentation done with slides or overhead transparencies.
3) Gains and Holds attention : People are more interested in multimedia message which combine the elements of test, audio, graphics and video because it offers greater understanding and retention of information.
4) Good for 'Computer -Phobic :- Those who are intimidated by computer keyboard and complex instructions are more comfortable with pressing buttons with a mouse or so a screen.
5) Multimedia is entertaining as well as educational .
Infrared uses infrared light waves to communicate over short distances. It is can only travel in a straight line. This requires that sending and receiving devices must be in clear view another without any indication blocking that view. One of the most common applications is to transfer data and information from a portable device such as a notebook computer or PDA to a desktop computer.
Radio frequency (RF) uses radio signals to communicate between wireless devices. For example, cellular telephone and many Internet-enable devices use RT to Place telephone calls and /or to connect to the Internet . Some end users connect their notebook or handheld computers to a cellular telephone to access the Web from remote location. Most home or business wireless network are based on a standard called wi-fi (wireless fidelity).
Bluetooth is a short-range radio communication standard that transmits data over short distances of up to approximately 33 feet. Bluetooth is widely used for wireless headsets, printer connections, and handheld device.
Microwave communication uses high - frequency radio waves. Like infrared, microwave communication provides line-of-sight communication because microwaves travel in a straight line. Because the waves bend with the curvature of the earth, they can be transmitted only over relatively short distances. Thus, microwave is a good medium for sending data between buildings in a city or on a large college campus. For longer distances, the microwave dishes or antennas. These stations. Any of these are offered by Intelsat, the International Telecommunications Satellite. Consortium, which is owned by 114. Government and form a worldwide communication system. Satellite rotate at a precise point and speed above the earth. They can amplify and relay microwave signals from one transmitter on the ground to another. Satellite can be used to send and receive large volumes of data. Uplink is a term relating to sending data to a satellite. Download refers to receiving data from a satellite. The major drawback to satellite communication is that bad weat weather can sometimes interrupt the flow of data
One of the most interesting application of satellite communication is for global positioning. A network of 24 satellites owned is and managed by the Defense Department continuously sends location information to earth. Global positioning system (GPS) device us3 that information to uniquely determine the geographical location of the device. Available in many automobile to provide navigational support, these systems are often mounted into the data with a monitor to display maps and speakers to provide spoken directions . Many of today's cell phones , including the Apple iPhone, use GPS technology for handheld cell phones, including the Apple iPhone, use GPS technology for handheld navigation
Advantage of Multimedia :
The use a Multimedia offers many advantages
1) Enhancement of text only messages: Multimedia enhances text only presentation by adding interesting sound and compelling visuals .
2) Improves oven Traditional Audio- Vidio presentations: Audiences are more attentive to multimedia messages than than traditional presentation done with slides or overhead transparencies.
3) Gains and Holds attention : People are more interested in multimedia message which combine the elements of test, audio, graphics and video because it offers greater understanding and retention of information.
4) Good for 'Computer -Phobic :- Those who are intimidated by computer keyboard and complex instructions are more comfortable with pressing buttons with a mouse or so a screen.
5) Multimedia is entertaining as well as educational .
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