Answer / abhishek

GSM is a Global System for Mobile Communication.Which allow
all the the network connection. Example: In GSM handset u
can take Airtel or Vodafone or Reliance or Idea.etc.network
connection for the same handset.

But CDMA is a code division mutiple acces .Which allows only
one network connection. Example if u have taken Reliance
CDMA connection,then u cant use CDMA handset for other
network connection (Vodafone,Idea etc..).

Answer / dastoger bashar

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Answer / vipul srivastava

GSM and CDMA have following differences-

1. The GSM stands for global system for mobile communication and CDMA for code division multiple accesses.

2. GSM is a form of multiplexing, which divides the available bandwidth among the different channels. Most of the times the multiplexing used is either TDM (Time division multiplexing) or FDM (Frquency division multiplexing). On the other hand CDMA is a type of multiple access sceheme( which means allotting the given bandwidth to multiple users) and makes use of spread spectrum technique which is essentially increasing the size of spectrum.

3. In CDMA each user is provided a unique code and all the conversation between 2 users are coded. This provides a greater level of security to CDMA users than the GSM ones.

You can understand the basic difference between CDMA and GSM with the following example.

Suppose there is a big room in which there are 10 couples who wish to talk but in way that they are not disturbed. There are 3 ways of doing this-

1. Only one couple stay in the roo and rest 9 leave it for a while, say 5 minutes. For those 5 minutes that couple can talk with each other and at the end of that it will go out and the next couple will come. At the end of the time slot of 10th couple, the 1st couple will come back to continue its conversation and the cycle would continue.

This is analogous to TDMA (Time division Multiple acess) a technique derived from TDM.

2. Another way is to divide the area of the room in 10 equal parts and then ask these couples to stay within their respective areas and talk.

This is analogous to FDMA (Frequency Division Multiple Access), a technique derived from FDM.

3. Finally the couples can be allowed to stand anywhere in the room and converse. They need not wait to get their time slot or be confined in a particular place. The only condition now is that all of them must speak in different languages.

This is analogous to CDMA technique.

I hope it will help you to understand these technologies.

Answer / phebion njerere

THROUGH THE USE OF SMART CARDS DSTV IS AN EXAMPLE OF
PRODUCTS THAT USES GSM

Answer / gopinath

GSM stands for Global system for Mobile Communication and
CDMA stands for Code Division Multiple Access.
In CDMA mobile phone instruments are dedicated to the any service provider.but,GSM mobile phone instruments are portable across service providers through SIM cards.GSM
uses tdma & fdma techniques as access mechanism.but,CDMA uses cdma techniques as access mechanism.

Answer / priya

If we use GSM technique in a mobile we can able to change
our SIM.

In CDMA it's not possible.

Answer / mayur

in GSM the frequency band is 900 mhz-1800 mhz
in CDMA for 3g the frequency band is 1900 mhz-2100 mhz

Answer / reetharose

Code division multiple access(CDMA) describes a
communication channel access principle that employs
spread-spectrum technology and a special coding scheme
(where each transmitter is assigned a code) to differentiate
between various calls whereas for Global System for Mobile
Communications(GSM) is a specification of an entire wireless
network infrastructure that uses a narrow-band . With the
advent of cellular phones doing double and triple duty as
streaming video devices, podcast receivers and email
devices, speed is important to those who use the phone for
more than making calls,CDMA has been traditionally faster
than GSM, though both technologies continue to rapidly
leapfrog along this path. Both boast "3G" standards, or 3rd
generation technologies.If you need to make calls to other
countries, a GSM carrier can offer international roaming, as
GSM networks dominate the world market. If you travel to
other countries you can even use your GSM cell phone abroad,
providing it is a quad-band phone (850/900/1800/1900 MHz).
By purchasing a SIM card with minutes and a local number in
the country you are visiting, you can make calls against the
card to save yourself international roaming charges from
your carrier back home.For this you can unlock your mobile
from network lock with a service of an online vendor like
http://www.classicunlocking.com/supported-phones/rs17wp7
.CDMA phones that are not card-enabled do not have this
capability, however there are several countries that use
CDMA networks. Check with your CDMA provider for your
specific requirements.

Answer / dashmesh singh

Please check this best tabular difference where both are compared on parameter basis:




http://allroundexpert.blogspot.com/2013/12/difference-between-cdma-and-gsm.html

Answer / guest

GSM tends for Global System for mobile communication.It is
based on TDMA & FDMA technique.CDMA is code division
multiple access it is based on multiple access technique.
In this technology the conversation betwwen two user are
coded so it is more secure than GSm.

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