simply gsm is a 2g network and cdma is 3g network
Posted: 07-02-2013 @ 13:39:46
Gsm-it works on 2g and it has exterior sim
cdma-it has several networks and it has inbulit sim
Posted: 29-01-2013 @ 23:34:16
Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA) are two competing standards in cellular service. They both have derivatives for use with 3G phones known as Universal Mobile Telecommunications System (UMTS) and CDMA2000, respectively. The major difference between the two technologies is how they turn voice data into radio waves and how the carrier connects to the phone. Other differences include the coverage area, the data transfer speeds, and the type of hardware used.
Some areas and countries only have one technology available, so users should be sure to review coverage maps before buying a phone. Generally speaking, CDMA is most commonly found in North America and some parts of Asia, while GSM is found in most other places. Some carriers do offer international or "world" phones that can work with both, but if the phone is going to be used predominantly in one area, it may make sense just to get one that's tied to one type.
Data Transfer Speed
Both technologies can be used with 3G standard phones, but 3G GSM speeds can be faster than 3G CDMA speeds, which can make a big difference for those who use their phones for social networking, email and streaming video. The fastest 3G standard used with CDMA2000 is EV-DO Rev B., which has downstream data rates of about 15.67 Megabits per second (Mbit/s). The fastest standard available with UMTS is HSPA+, with downstream speeds of up to 28 Mbit/s.
GSM phones and CDMA phones also use different types of smart cards known as Universal Integrated Circuit Cards (UICC). These are small removable cards that can be used to store information like a contact list and activate, interchange, and upgrade phones without carrier intervention as long as the phone is unlocked. This means that the carrier makes it possible for phone to work even if the end user removes and changes the card. Though both types can be sold locked, this is more common with CDMA phones.
UICCs can be programmed to work with either GSM or CDMA and their derivatives, or with both. Those that only work with GSM phones are called Subscriber Identity Module (SIM) cards and those that only work with CDMA phones are called CDMA2000 Subscriber Identity Module (CSIM) cards. There are also a few types of UICCs that are programmed to work with GSM, UMTS, CDMA, and CDMA2000, including CSIM/USIM cards and Removable User Identity Module (R-UIM) cards.
Posted: 29-01-2013 @ 18:43:40
The major difference between GSM and CDMA is GSM uses Time Division Multiple access to simply each local network allocated time slice of cycles where it" owns" its bandwidth..So it used to send or receive data...In CDMA its different ituses Code Division Multiple Access....So this differs how to break the time of slice in cycles.........This is the basic difference in my point of view......
Posted: 29-01-2013 @ 18:20:10
there are various dimensions of differences between GSM and CDMA.
On user level we can say that CDMA provides better voice quality, faster internet and better service experience as compared to GSM.
Also CDMA signal range is less powerful as compared to GSM.
CDMA enabled handset consume less power than GSM handsets.
When goes to more details GSM is Time Division Multiple Access while CDMA is Code Division Multiple Access.
That means, GSM divides the whole radio frequency bands into number of small frequencies and those frequency is further divided into number of time slots which are used by individual user. On the other hand, In CDMA , an specfic code is written for each user and user has access to whole frequency band.
Posted: 24-01-2013 @ 23:04:58
GSM:- These work on 2g network only.
CDMA:- These work on 35 network only.
Posted: 19-01-2013 @ 15:52:15
gsm have an exterior sim card while cdma have an inbuilt sim card
Posted: 19-01-2013 @ 15:27:22
GSM:- it is connection less system.
CDMA:- it is connection oriented system
Posted: 11-01-2013 @ 22:04:00
GSM and CDMA are competing wireless technologies with GSM enjoying about an 82% market share globally. In the U.S., however, CDMA is the more dominant standard. Technically GSM (Global System for Mobile communications, originally from Groupe Spécial Mobile) is a specification of an entire wireless network infrastructure, while CDMA relates only to the air interface — the radio portion of the technology.
Stands for: Global System for Mobile communication.
Storage Type: SIM (subscriber identity module) Card.
Global market share: 75%.
Dominance: Dominant standard worldwide except the U.S.
Data transfer: GPRS is again very slowforward.
Network: Every cell has a corresponding network tower, which serves the mobile phones in that cellular area.
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). CDMA also refers to digital cellular telephony systems that use this multiple access scheme, as pioneered by QUALCOMM, and W-CDMA by the International Telecommunication Union (ITU), which is used in GSM’s UMTS. CDMA
Stands for: Code Division Multiple Access.
Storage Type: Internal Memory .
Global market share: 25% .
Dominance: Dominant standard in the U.S.
Data transfer: Faster on EVDO platform which is applicable in CDMA only .
Network: There is one physical channel and a special code for every device in the coverage network. Using this code, the signal of the device is multiplexed, and the same physical channel is used to send the signal.
Posted: 24-12-2012 @ 12:09:01
Gsm is sim use. Cdma is no sim use
Posted: 15-12-2012 @ 20:59:52
There is not much difference in gsm and cdma. GSM is a network which is used to send 2g network throughout the country. CDMA does not contain 2g /3g/4g ..etc. CDMA means code division multiple access, which is done so as to share a share a band of frequencies or network. This is done to create multiple access to a network by code.
Posted: 06-11-2012 @ 21:42:10
Hey hope this little write up will help you with the concept of TDMA and CDMA.
1. GSM (Global 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 (Code 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.)
3. The Main points of contention between TDMA and CDMA is as below:-
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
Posted: 03-09-2012 @ 16:50:12
GSM is a 'cellular' technology, that is, the entire coverage area is divided into various hexagonal shaped cells (hence the popular name 'cell phones'). Every cell has a corresponding network tower, which serves the mobile phones in that cellular area. For example: Imagine a honeycomb on a tree in a hexagonal shaped garden. The garden has many flowers. The honeybees collect the nectar from the flowers, and deposit it in the honeycomb. Your mobile phones are like the flowers, the network tower is like honeycomb, and the bees are the signals.
As the name suggests (Code Division Multiple Access), there are many devices which use the same spread spectrum (hence multiple access). There is one physical channel, and a special code for every device in the coverage network. Using this code, the signal of the device is multiplexed, and the same physical channel is used to send the signal (the codes may or may not change).
Posted: 31-05-2012 @ 17:40:04
Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA) are two competing standards in cellular service.
cdma mobile has no sim card and gsm have there sim card
Posted: 30-05-2012 @ 19:10:48
These are the methods of frequency spectrum allocation in cell phone technology.
For more info, google it.
Posted: 29-05-2012 @ 23:31:47
Global System for Mobile Communications (GSM) and Code Division Multiple Access (CDMA) are two competing standards in cellular service. Cellular carriers including Sprint, AT&T, Verizon and T-Mobile use one or the other. The major difference between the two technologies is how data turns into radio waves and how the carrier connects to the phone. Other differences include the coverage area, number of users, and the way a carrier identifies a phone on its network. A cell phone user should choose GSM or CDMA based on her location and coverage needs.
Posted: 23-05-2012 @ 15:17:01
The main difference between GSM and CDMA is: In GSM, the
entire frequency band is not available to the end-user,
while in CDMA the entire frequency band is available to the
end-user. So, the Frequency Re-use factor is 1 in CDMA.
GSM Works as follows:
The entire frequency band is divided into chunks and
each such chunk is divided into timeslots and each such
portion is made available to a user.
CDMA Works as follows:
The entire frequency band is available to the user. So,
in order to differentiate, the transmission from each user
is "spread" or coded using an unique code given to
individual user. At the receiving end, the spread
information is decoded.
Posted: 12-05-2012 @ 02:38:45