Differentiate between wireless transmissions media: Infrared

Differentiate between wireless transmissions media: Infrared, broadcast radio, cellular radio, microwaves, and communications satellite

Conclusion

INFRARED - Computer devices such as a mouse, printer, and digital camera, which have an IrDA port may transfer data from one device to another using infrared light waves.

MICROWAVES - are radio waves that provide a high-speed signal transmission.

COMMUNICATIONS SATELLITE - is station in the space that receives microwaves signals from an earth-based station, amplifies the signals, and broadcasts the signals back over a wide area to many earth-based stations.

Communicatons Satellite

I can see my house from here

What is a Communications Satellite?

A communication satellite is a space station that receives microwave signals from an earth-based station, amplifies (strengthen) the signals, and broadcasts the signals back over a wide area to any number of earth-based stations.

Communications satellites are usually placed about 22,300 miles above the Earth's equator and moves at the same rate as the Earth.

Applications of communications satellite include television and radio broadcasts, videoconferencing, paging, and global positioning systems.

Advantages of satellites

Lots of data can be sent simultaneously.

Allow high quality broadband communication across continents.

Disadvantages of satellites

The fee to launch a satellite is extremely expensively.

The infrastructure needed to access satellite communications is also expensive.

Microwaves

How it works!

What is a microwave?

Microwave transmission refers to the technology of transmitting information or energy by the use of radio waves whose wavelengths are conveniently measured in small numbers of centimeter; these are called microwaves. This part of the radio spectrum ranges across frequencies of roughly 1.0 gigahertz (GHz) to 30 GHz. These correspond to wavelengths from 30 centimeters down to 1.0 cm.

Microwaves transmission involves sending signals from one microwave station to another.

Microwaves transmission is fast (up to 4,500 times faster than a dial-up modem) but is limited to line-of-sight transmission, which means that the microwaves must transmit in a straight line with no obstructions between microwave antennas.

Microwaves stations often locate on the tops of buildings, towers, or mountains to avoid possible obstructions.

Microwaves transmission is used where installing physical transmission media is difficult or impossible (e.g., deserts, lakes, or to communicate with a satellite), but light-of-sight transmission is available.

Broadcast and Cellular Radio

Types of Cellular Radios

What is a Broadcast Radio?

Here are some examples

What is a Cellular Radio?

Is a form of broadcast radio that is used widely for mobile communications, specifically wireless modems and cellular telephones.

Personal Communications Services (PCS) is a set of technologies used for completely digital cellular devices such as handheld computers, cellular telephones, pagers, and fax machines.

CDMA (Code Division Multiple Access) is the most popular PCS technology because of its fast transmission sped and lower cost.

A newer technology, called 3G, provides even faster transfer rates than PCS so that users can display multimedia, watch TV, or conduct a videoconference on a cellular device.

A transmitter is needed to send the broadcast signal and a receiver is needed to accept the signal.

Some networks use a transceiver, which both sends and receives signals from wireless devices.

Bluetooth is a kind of short-range (about 10 meters) broadcast radio communications, which can transmit data at a rate of 1 Mbps among Bluetooth-enabled device.

Examples of Bluetooth devices include desktop computers, notebook computers, handheld computers, Internet appliances, cellular telephones, and printers.

Wireless networks using broadcast radio often use one of the 802.11 specifications.

The 802.11b specification provides transfer rates up to 11 Mbps.

The 802.11a specification provides transfer rates up to 54 Mbps.

A form of wireless transmission used in communications is the broadcast radio, such as Bluetooth. For this form of transmission, a transmitter is required to send the broadcast radio signal and a receiver antenna to accept the feed. Broadcast radio is slower and more susceptible to noise than physical transmission media, but provides flexibility and portability between homes and businesses.

Infrared

IR BLASTER AWAY!

What is Wireless Transmission Media

It is reception are achieved by means of an antenna. One of the most common physical medias used in networking is copper wire. Copper wire to carry signals to long distances using relatively low amounts of power.

Infrared technology allows computing devices to communicate via short-range wireless signals. With infrared, computers can transfer files and other digital data bidirectionally. The infrared transmission technology used in computers is similar to that used in consumer product remote control units.

Miguel Aguilar

CIS 10