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Wireless Communication

This rapidly growing segment of the communication industry has the potential of providing high-speed high-quality information exchange between portable devices. Wireless communication enables several applications including multimedia Internet-enabled cell phones, automated highway systems, smart homes and appliances and videoconferencing, among others.

4,616 Questions

What are four types of communication?

AnswerWire, fiber-optic, or wireless (IR or RF).

-DJ Craig

AnswerMedia used for communications:
  • recorded media (books, newspapers, CD ROMS, memory sticks, etc) physically delivered from transmitter to receiver and decoded visually, mechanically, magnetically or electronically;
  • air and other fluids (sound or pressure waves, light, IR, RF, often modulated)
  • solids (mechanical motion or vibration, electrical signals, magnetic tapes and disks, visible light in glass)
  • vacuum (RF, visible light)
Answer">Answer">Answer">Answercommunication media (transmission media)are of two types:-

guided and unguided

guided communication media includes :-Twisted pair ,fiber optic ,coaxial cabel

unguided media includes: antenna ,Broad cast radio

Answer

Communication media (also called transmission media or communication channels) may be wired or wireless.

Wired media include copper cables (e.g., twisted-pair copper wire cable - the "telephone cable", coaxial cable, UTP cable - the "LAN cable", etc.) and optical fiber cables (made of glass or plastic). Copper cables allow the propagation of electric signals (i.e., electric voltage or current pulses), whereas optical fiber cables allow the propagation of light pulses.

Wireless media include the free space, the ionsphere, etc. Wireless media allow the propagation of electromagnetic waves. The transmission/reception of electromagnetic waves requires the use of some wireless link(also called radio link, due to the fact that radio broadcast was one the first commercial wireless communication system in use), such as terrestrial microwave links, satellite links, etc.

Other types of channels include storage media (e.g., hard disks, cd, dvd, etc.) and underwater acoustic channels(which allow the propagation of sound waves).

Communication channels vary in capacity (i.e., the amount of information per time unit that can be carried in a reliable fashion), attenuation (i.e., reducing of transmitted signal's strength; attenuation increases with the channel length), distortion (i.e., alternation of signal's variation pattern, where is impressed the information), noise (i.e., random unwanted signals that corrupt the signal shape), etc.

Kotsos

Were there cell phones in 1997?

Yes ,but they weighed like 5 lbs each. The were like the ones in Beverly Hills Cop when Eddie Murphy was in California.

Can a phone without a sim cause radiation?

Yes, mobile phones without sim cards can emmit radiation because of a microchip contained in it.

What charities accept donations of cell phones for recycling?

There are many charities across the U.S. that accept donations of cell phones for recycling. In some cases, the phones will be refurbished and distributed to soldiers or other people in need. A good place to start is by calling the charities in your vicinity to see if they accept this type of donation.

What is the smallest cell phone with a qwerty keyboard?

It really depends what you mean by a UK phone. There are lots of Korean phones that will work in the UK (www.chinavasion.com) which are really high quality and pretty cheap compared to ours. But if you mean phones that are popular in the UK and you would see in carphone warehouse and stuff like that then I think it would be the Samsung E530HxWxD: 83x43x26mm

Hope that helps

Provides an infrared port for wireless communication?

Infrared ports, or IRDA, are on many laptops, PDAs and some phones. This is just like BlueTooth or Wifi, but slower. Two PDAs can exchange data this way quite easily.

What is advantage of using mobile phones?

Mobile phones are used for a variety of purposes, such as keeping in touch with family members, for conducting business, and in order to have access to a telephone in the event of an emergency. Some people carry more than one mobile phone for different purposes, such as for business and personal use.

How do you block incoming call on boost mobile?

This can be done via the Boost website. There will be a prompt to enter the mobile number from which one wishes to view the calls, followed by a request for the passcode. This will enable the user to view their incoming calls from the past month.

What country invented the phone?

Dr Martin Cooper, a former general manager for the systems division at Motorola, is considered the inventor of the first portable handset and the first person to make a call on a portable cell phone in April 1973. The first call he made was to his rival, Joel Engel, Bell Labs head of research. AT&T's research arm, Bell Laboratories, introduced the idea of cellular communications in 1947. But Motorola and Bell Labs in the sixties and early seventies were in a race to incorporate the technology into portable devices. Cooper, now 70, wanted people to be able to carry their phones with them anywhere. While he was a project manager at Motorola in 1973, Cooper set up a base station in New York with the first working prototype of a cellular telephone, the Motorola Dyna-Tac. After some initial testing in Washington for the F.C.C., Mr. Cooper and Motorola took the phone technology to New York to show the public. In 1973, when the company installed the base station to handle the first public demonstration of a phone call over the cellular network, Motorola was trying to persuade the Federal Communications Commission to allocate frequency space to private companies for use in the emerging technology of cellular communications. After some initial testing in Washington for the F.C.C., Mr. Cooper and Motorola took the phone technology to New York to show the public. On April 3, 1973, standing on a street near the Manhattan Hilton, Mr. Cooper decided to attempt a private call before going to a press conference upstairs in the hotel. He picked up the 2-pound Motorola handset called the Dyna-Tac and pushed the "off hook" button. The phone came alive, connecting Mr. Cooper with the base station on the roof of the Burlington Consolidated Tower (now the Alliance Capital Building) and into the land-line system. To the bewilderment of some passers-by, he dialed the number and held the phone to his ear. Who is he? Cooper grew up in Chicago and earned a degree in electrical engineering at the Illinois Institute of Technology. After four years in the navy serving on destroyers and a submarine, he worked for a year at a telecommunications company. Hired by Motorola in 1954, Mr. Cooper worked on developing portable products, including the first portable handheld police radios, made for the Chicago police department in 1967. He then led Motorola's cellular research.

What could the first cell phone do?

The first cell phone was just like the home phones when Bell Telephone dominated the industry. You could make and receive phone calls. No voice mail. No text messages. It might have had redial, or even a speed dial. But very likely not much more than that. Oh, it was also about the size of a brick (but weighed half as much) and the battery wouldn't last more than an hour or two of talk time. Yeah, we've come a very long way since then.

When was the the first handheld phone invented?

we did ours at the actual reptceion cuz we did the bubbles when we left there. I actually had a bubble boy (little bro of one of my Jr bridesmiads who was very disapointed he wasnt the ring bearer, but hes a little hellion and I didn't trust him on stage .so i gave him that job!) We let everyone get their food and then I got him to walk around with a bucket full and pass them out .he felt all important! If you are doing it as you leave the ceremony I would give them out with your programs so they have them more together so you can make a quicker exit.

How have mobile phones changed the world?

the phone changed the world by letting us be able to speak to each other even though we could be 1000 miles

Answer

Telephone bridges the gap of long distance communication. Modern telephone system such as the virtual PBX or IP PBX even have functions and features that allow us to make cheap calls and enjoy the benefits of the VoIP service and IP Phone technologies.

What is a signature on a cell phone?

you go to messages, scroll down till u c settings den go down to signature. It works dis way 4 virisen n altell.

What is the purpose of proximity sensors in mobile phones?

It enables your mobile to switch off lights during calls... Located near the earpiece at the top of the phone.... Helps to save battery... Actually detects the distance to surfaces....

How can texting while driving be a good thing?

Well, the short answer is that there are none. Texting distracts you from the road, even if you can look up and still type correctly you're attention is still focused on the cell phone not the road. Cell phone use is also illegal while driving in several states.

If you text at night the light from the cell phone can readjust your eyes and temporarily alter your night vision which you render you incapable of seeing something on or beside the road and result in an accident.

What is Obama's personal mobile phone number?

Contact Information

Address:

The White House

1600 Pennsylvania Avenue

Washington DC 20500

Phone:

Switchboard: 202-456-1414

Comments: 202-456-1111

FAX: 202-456-2461

Website: see related link below

(Don't expect to get the President on the phone personally, but you will be able to leave a message for him, or possibly get through to his staff.)

Why are cell phones good for you?

Radio waves from cell phones can lead to brain cancer

so yes

What are disposable cell phones?

While most prepaid cell phones are not disposable phones, most disposable cell phones are prepaid phones. Disposables have not really caught on in the U.S., since pretty decent prepaid phones can be purchased, on sale, for as little as $20 or even $10, while some disposables cost upward of $50. Prepaid carriers also offer advanced phone equipment that can cost over $100 and comes with a year warranty; such phones are hardly disposable. There are different concepts of disposable cell phones. The phone is often an unlocked phone usable with almost any carrier, but not necessarily. The instrument has very limited functionality: you can talk, and you can text. It might not have a display of any kind. It might come with minutes, or you may need to contact a prepaid carrier to purchase minutes. But the main idea is that the phone is ready to go, or just about; requires no contract or any kind of sign-up; and is cheap enough that you're comfortable tossing it after using it for just one vacation or even just one hour of talk. Some companies offer a small refund on phones returned for recycling. Because there is no record of a purchaser, disposable phones are suspect tools of terrorists, recent news articles state.

What does Mm Kay mean in texting?

It's like a shorter way of saying the phrase 'mmkay.' Basically saying something like 'okay' or 'kk.'

When were cell phones available to public?

going through some data in the internet, I found out I was going to answer this question a little bit wrong. in the related links box below I will post an article on the history of cell phones wich will make it better for you to decide which is the best answer.

Why is copper in a mobile phone?

The main reason copper might be used in any electronic device is because it is one of several excellent conductors of electricity, and it is malleable - easily shaped as needed.

Durability is not really an issue in cell phones, as the conductors are not usually subject to stress due to motion (except to some extent with tilt &/or slider designs.) Copper is NOT unbreakable. Single, or even a couple, strands of most CAT 5 copper Ethernet cable (whether solid copper or stranded copper) can be broken with bare hands, and even heavier cables can be broker with adequate force.

What materials did Dr Martin Cooper use to develop the first cell phone?

He started phones out a a big box which they had in the old days and then technology mad the screens touch and the text keyboard. Everything is evolved by technology. Where would the world be without it