Answer / balu

GSM Stands for "Global System for Mobile communication".AND
CDMA Stands for "Code Division Multiple Access".GSM is more
advantages then CDMA.One of the advantage is 3G techology.

Answer / selvaa

Gsm is mobile n/w particular persons contact(0-30) cdma is rural area n/w

Answer / linku

GSM:
GSM stands for Global System for Mobile Communication and it operates on three frequencies 900,1800 and 1900 MHz.But in India we're using 900 and 1800 MHz.It uses time division multiple access(tdma) and frequency division multiple access(fdma).
CDMA:
CDMA stands for Code division multiple access.It operates on 450,800 and 1900 MHz.But we're using 800MHz.
----------------------------------------------------
But the main difference between GSM and CDMA is,in GSM the transmission media is air and in CDMA the transmission media is optical fibre cable and it works on the principle of total internal reflection.

Answer / chinna

WHICH ONE IS BETTER ONE?

Answer / ankita sharma

in ans 8. . . . . . . .. it is not mobile station but it
is mobile software.plz send ans r u satisfied with dis ans.

Answer / raghu

gsm abbriviat the globle System for Mobile Communications..............
GSM is the “branded” term referring to a particular use of
TDMA (Time-Division Multiple Access) technology. GSM is the
dominant technology used around the globe and is available
in more than 100 countries. It is the standard for
communication for most of Asia and Europe. GSM operates on
four separate frequencies: You’ll find the 900MHz and
1,800MHz bands in Europe and Asia and the 850MHz and
1,900MHz (sometimes referred to as 1.9GHz) bands in North
America and Latin America. GSM allows for eight
simultaneous calls on the same radio frequency and
uses “narrowband” TDMA, the technology that enables digital
transmissions between a mobile phone and a base station.
With TDMA the frequency band is divided into multiple
channels which are then stacked together into a single
stream, hence the term narrowband. This technology allows
several callers to share the same channel at the same time.

2. CDMA abbriviat theC ode Division Multiple
Access.............................. CDMA takes an
entirely different approach from GSM/TDMA. CDMA spreads
data out over the channel after the channel is digitized.
Multiple calls can then be overlaid on top of one another
across the entire channel, with each assigned its
own “sequence code” to keep the signal distinct. CDMA
offers more efficient use of an analog transmission because
it allows greater frequency reuse, as well as increasing
battery life, improving the rate of dropped calls, and
offering far greater security than GSM/TDMA. For this
reason CDMA has strong support from experts who favor
widespread development of CDMA networks across the globe.
Currently, you will find CDMA mostly in the United States,
Canada, and North and South Korea. (As an interesting
aside, CDMA was actually invented for the military during
World War II for field communications.)

Answer / anil

gsm used unique number throught word and coverage is very good.
cdma uses seperate code for each user so frequency is very
high for each user. entire bandwidth is dedicated to each
user.where as in gsm entire BW in divided into time slots
and frequency slot

Answer / palak

this is not because in GSM Call Handle Capacity is more Than Cdma So Gsm is now very usefully

Answer / s.narsimha swamy

Coverage area is less in GSM as compare to CDMA,
GSM uses FDMA,TDMA Techniques butr CDMA uses only CDMA
Technique.

Answer / rohit singh

a. Data Transfer Speed : 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.
EVDO, also known as CDMA2000, is CDMA's answer to the need
for speed with a downstream rate of about 2 megabits per
second, though some reports suggest real world speeds are
closer to 300-700 kilobits per second (kbps). This is
comparable to basic DSL. EVDO is in the process of being
deployed. It is not available everywhere and requires a
phone that is CDMA2000 ready.
GSM's answer is EDGE (Enhanced Data Rates for GSM
Evolution), which boasts data rates of up to 384 kbps with
real world speeds reported closer to 70-140 kbps. With
added technologies still in the works that include UMTS
(Universal Mobile Telephone Standard) and HSDPA (High Speed
Downlink Packet Access), speeds reportedly increase to
about 275—380 kbps. This technology is also known as W-
CDMA, but is incompatible with CDMA networks. An EDGE-ready
phone is required.


b. Subscriber Identity Module (SIM) cards : In most of the
countries only GSM phones use SIM cards. The removable SIM
card allows phones to be instantly activated, interchanged,
swapped out and upgraded, all without carrier intervention.
The SIM itself is tied to the network, rather than the
actual phone. Phones that are card-enabled can be used with
any GSM carrier.
The CDMA equivalent, a R-UIM card, is only available in
parts of Asia . CDMA carriers require proprietary handsets
that are linked to one carrier only and are not card-
enabled. To upgrade a CDMA phone, the carrier must
deactivate the old phone then activate the new one. The old
phone becomes useless

c. Roaming : For the most part, both networks have fairly
concentrated coverage in major cities and along major
highways. GSM carriers, however, have roaming contracts
with other GSM carriers, allowing wider coverage of more
rural areas, generally speaking, often without roaming
charges to the customer. CDMA networks may not cover rural
areas as well as GSM carriers, and though they may contract
with GSM cells for roaming in more rural areas, the charge
to the customer will generally be significantly higher.


d. International Roaming : 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

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