describe the diffrent features of telephone systems and how to use them?
someone help me out please and tell me how to start the statement off i really need help . am a new user... thanks-
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- RTFM It would be me asking how to fly a plane, especially if you don't know whether I am trained or if I'm blind.
- Telephone systems are from the very simple (POTS - Plain Old Telephone service) over the PSTN Public Switched Telephone Network. POTS is basically the ability to send and receive telephone calls. Then you can go into the PANS (LOL I heard someone call it the Pretty Amazing New Stuff), not really a telephone term, but does hint at what you can do. A basic telephone call uses the frequency range of 300 to 3000 Hertz to allow your voice to be recognizable to the person that you are talking. If you are going over a long distance then the bandwidth that you use is 64,000 bits per second. You can also have features like "Call Waiting", you are talking on the phone some one calls you and you can put the first caller on hold and talk to the second, and switch between the two callers. You can have "Call Forward", so that if you go to a friend's house then you have your telephone number forwarded to their telephone. You can have "Call Answer" which means that if you are on the phone or not at home then the telephone system will answer your phone and take a message and play it back for you. You can have Cell phones that do not require wires and which can be used anywhere in the world (in some cases it will be expensive, and you will need to have it set up ahead of time). There is VoIP or Voice over Internet Protocol, which means that you can use your computer to make telephone calls, or you can have a system that will take your regular voice (remember the 300 to 3000 hertz) and convert it into a digital signal (remember the 64,000 bits per second) and transmit it over the Internet. You can have voice compression that will allow you to send the same quality of voice as the 64,000 bits per second but only use 32,000 bits per second, or 16,000 bits per second or 8,000 bits per second. These systems use analysis of people's voices and from what you are saying now predict what will come next, then measure your voice and only send the difference from their guess to the actual voice. The better the guess, then the less information has to be sent and the lower the bandwidth. I have probably given you more than you want, but I hope that you will use the Internet to go to the various sites that give you information on Alexander Graham Bell, and Elisha Gray to discover some of the controversy that surrounds the invention of the telephone.
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