Long Distance Information
CDMA: code division multiple access.
A coding scheme, used as a modulation technique, in which multiple channels are independently coded for digital transmission over a single wideband channel.
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Cellular phone/mobile.
A communications system that uses a combination of radio transmission and conventional telephone switching to permit telephone communication to and from mobile users within a specified area.
In cellular mobile systems, large geographical areas are segmented into many smaller areas, i.e., cells, each of which has its own radio transmitters and receivers, interconnected with the public switched telephone network.
Digital
To encode information using series of bits, each stating 1 or 0.
(see also Bit)
Dual-band:
working on 2 frequency bands (such as 800MHz and 1900MHz) with one signal format, is called dual-band phone.
Dual mode:
is single phone mode, plus will also work with an analog signal system.
Frequency
The number of cycles or events per unit time, measured in Hertz at which an electrical current alternates. Also known as indication for radio frequency location.
GHz: See Hertz.
GPRS: general packet radio service.
Is based on packet transmission.
In order to take the quickest possible route, parts of the message sent by GPRS, travel separately through networks to its destination.
This means higher transmission speed (approx. 35 kbps) than GSM (approx. 9 kbps).
GPRS terminals/phones are permanently online; you don't pay for the time but for the amount of data you send and receive.
'Always on' might be the most important advantage of GPRS.
Hertz. (abbreviation: Hz)
A frequency measurement equal to one cycle/wave per second.
Kilohertz (KHz)is thousand Hertz. Megahertz (MHz) is million Hertz.
Gigahertz (GHz) is billion Hertz.
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