Monday, 17 December 2012

Free Wallpaper For Cell Phones


Source (google.com.pak)
Free Wallpaper For Cell Phones Biography
A phone “rings” when its network indicates an incoming call and the phone thus alerts the user. For landline telephones, the call signal can be an electric current generated by the switch or exchange to which the telephone is connected. For mobile phones, the network sends the phone a message indicating an incoming call.
A telephone “ring” is the sound generated when there is an incoming telephone call. The term originated from the fact that telephones originally had a ringing mechanism consisting of bells and an electromagnetically-driven clapper, producing a ringing sound. The aforementioned electrical signal powered the electromagnets which would rapidly move and release the clapper, striking the bells. This electromagnetic bell system is still in widespread use. The ringing signal sent to a customer's telephone is 90 volts AC at a frequency of 20 hertz in North America. In Europe it is around 60-90 volts AC at a frequency of 25 hertz. Some non-Bell system party lines in the US used multiple frequencies (20/30/40Hz, 22/33/44 Hz, etc.) to allow "selective" ringing.
In Australia the ring signal averages 100 V AC at 25 Hz.[1]

Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones
Free Wallpaper For Cell Phones

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