Difference between CDMA EVDO GSM and EDGE Mobile Phones

Mobile Devices

There are two major categories of mobile device protocols. One is known as GSM which stands for Global System for Mobile Communications. The other is known as CDMA which stands for Code Division Multiple Access. These are technologies which essentially allow a mobile device to communicate with a mobile communications network. It allows the network to identify the phone, the phone number and to provide wireless network connectivity through access points or mobile phone antennas.

GSM is a name for an implementation of a network protocol known as TDMA or Time Division Multiple Access. This protocol allows up to eight callers to use the same frequency with a technology remarkably similar to communications between a mobile phone handset and base station. Each frequency is divided into "channels" each of which can be used by a different caller but which are combined by the protocol into a "stream" which is transmitted to the network.

While GSM can be thought of as a vertical signal, with calls stacked on top of one another, CDMA constructs a more horizontal signal, with calls occupying the entire width of the frequency, but sequenced so that each call has its own "place in line" so to speak. CDMA has some theoretical advantages with analog transmissions due to the way radio frequencies work.

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