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Published by on Wednesday, September 30, 2009 at 2:42:00 PM

Difference between CDMA EVDO GSM and EDGE Phones

Difference between CDMA EVDO GSM and EDGE Mobile PhonesBy : Lincoln Armstrong

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.

Since mobile phones have to do a lot more than just transmit and receive phone calls, the speed of network transmissions and the speed of network data access is becoming more and more important as mobile phone technology upgrades continue and new phones become available.

CDMA has been viewed as the faster technology for some time, despite the fact that GSM is available in more countries. The most recent upgrade to CDMA is CDMA2000 or EVDO, an acronym which stands for Evolution Data Optimized. EVDO operates in much the same way as the standard Internet Protocol (IP) or Transmission Control Protocol (TCP) does. Data exchanged between the phone and the network is transmitted in packets which conserves bandwidth and theoretically increases average speeds across the network.

CDMA2000 or EVDO capable network devices have practical average speeds in the 500Kbps range, roughly half that of a T1 wired Internet connection or approximately 1/4 the theoretical upper limit of speed on a cable modem wired Internet connection. Kbps stands for Kilobits per second.

The GSM upgrade is known as the EDGE protocol, which stands for Enhanced Data rates for GSM Evolution. EDGE network devices have speeds roughly 1/4 that of CDMA devices, or network connection speeds in the 120Kbps range.

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Published by IzajAhmed Shaikh.
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I am, Mr. IzajAhmed Shaikh, a Computer Professional and a Pro. Blogger, who belongs to Shahabad, Karnataka India. My basic Qualifications are B.Sc., and M.C.M. done from University of Pune., formerly known as, Poona University,. I like to write articles based on my personal experiences.