12-05-2010, 07:01 PM
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GSM, TDMA, CDMA And AMPS Mean info here
GSM, TDMA, CDMA And AMPS Mean info here
- GSM, TDMA, CDMA and AMPS are all forms of Wireless communication technologies. Each provides a different method of carrying data (or voice) from its source phone or computer to its destination phone or computer. Each is explained in some detail below:
- GSM (Global System for Mobile communication)
GSM is a digital mobile telephone system that is widely used around the world (especially in Europe). GSM uses a variation of TDMA and is the most widely used of all three digital wireless telephone technologies. GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot
- TDMA (Time Division Multiple Access)
TDMA (used in GSM, above) is a technology which divides each cellular channel into three slots in order to increase the amount of data that can be carried on a particular channel at a particular time.
- CDMA (Code Division Multiple Access)
CDMA, unlike TDMA and GSM, after digitizing data, spreads it out over the entire bandwidth available to it (unlike GSM and TDMA which place the calls side by side in three streams). Multiple calls are then overlapped on top of each other, and each is assigned a unique sequencing code to "unlock" the information only when and where it should be unlocked.
- AMPS (Advanced Mobile Phone System)
AMPS is the original standard for cellular products. All AMPS phones should work in almost any region across Canada or the United States.
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