BERITA PONSEL - Difference Between GSM and CDMA networks
Physically between GSM and CDMA mobile phones no significant difference even if both are similar at first glance. The difference is that the card is used or the cellular operators who operate these two types of these channels. For example, operators who work on both lines of CDMA operators are: smart, flexi, esia, fren, starone, cheerful, while the GSM operators include: sympathy, as, free XL, XL thumb, sun, im3, three and still have a other. For more details could be asked to counter-counter nearby, because almost every year of birth of the new service provider with a variety of services. While the old service providers to add new types of services also make it more competitive
The working principle of these two lines as a picture can be explained as follows, we sadurkan CE Magazine (Computer Easy) ed.12/2004 p.37 ff. In this discussion, will use a simple analogy to understand the lay of us who have not obvious difference between them, which is expected from the description below can understand the working principles of both these technologies.
Before discussing more about GSM and CDMA technology, it helps if you first understand the system sending and receiving data in digital networks, especially in the world of communications. All data sent or received in this network must be in digital form. The same thing applies to sound issued and received by the caller when communicating. The sound sent by the caller will be received by the microphone of the phone. Furthermore, this sound is converted into digital form and sent via radio waves to the Base Transceiver Station (BTS) of the operator used. BTS is receiving the data and used this phone and forwarded (switching) to the destination BTS. And BTS this purpose, the data will then be sent to your mobile destination that should receive the call. Of course, the phone receiver changes the received digital data into the form of voice to be heard by the recipient. This general principle applies to all digital systems, both GSM and CDMA. However, details of work and the principles of digital systems are not the same
GSM: Global System for Mobile Communications
GSM or Global System for Mobile Communications is a digital technology that works by sending data packets based on time, or better known as the timeslot. GSM itself is derived from technology Time Division Multiple Access (TDMA). TDMA technology is based on the data sent is divided into units of time, means a GSM data packet will be divided into several time slots.
Timeslot is to be used by the GSM network users are ternporer (temporary). The purpose and use of temporary timeslot is timeslot will be monopolized by the users during their use, apart and they are actively talking or being idle (silent).
The picture is much easier to understand the working principles of GSM. Analogues like this: if a taxi fleet (in this case acts as the operator) which has a fleet of 100 taxis (fleet as a time slot). Taxis (timeslot) is hired by a passenger (user). By default, these taxis can not be used by another user, although this could be the user is not in the cab (such as waiting or being a guest to a place while the taxi was told to wait). In this position, it was clear that the taxi had been booked by the first user and can not serve other passengers. Taxis are only able to be used by other passengers when the first user is finished using the taxi's (already up to goal and has been paid). This is called the principle of a temporary monopoly on the GSM network.
From the picture above it is clear that the system does not allow the use of GSM mobile phone when the system is full (when the entire fleet of taxis are hired, it is no longer an empty taxi passengers for hire new). This is what makes the user will hear a busy tone from his cell phone to make calls while out (outgoing call). However, the principles used by the GSM also has advantages. In theory, provided a dedicated timeslot ensures users can get the quality service that is more constant communication, not up and down.
The downside is when the GSM network is full, the phone owner usually will have difficulty to make calls or even receive calls. This is due to the lack of empty timeslot that can be used. Back to the analogy at the beginning of the discussion: if all taxis are hired, you will not get an empty taxi.
CDMA: Code Division Multiple Access
Unlike the GSM technology, CDMA technology does not use units of time, but uses a system of codes (coding). This principle is in accordance with CDMA stands for itself, the Code Division Multiple Access. Thus, CDMA systems use a specific code unique to regulate every call is in progress. This unique code will also eliminate the possibility of cross-or leaking.
As already discussed in the beginning, CDMA does not use units of time such as GSM / TDMA. This makes the CDMA network has a capacity greater than the GSM network. However, this does not mean that CDMA networks will be better than the GSM network because there are still certain limitations to the capacity of the network owned by CDMA.
Like the GSM network, a simple analogy to help you understand the principle of CDMA network. Analogues like this: if the GSM network as compared to taxis, the CDMA network can be thought of as a bus. A bus (compared to the frequency) can handle a lot of bus passengers (users who make calls). This is possible because each passenger using a specific code that is unique. It is also not allowing cross-communication or leaking. Each passenger can talk and set goals without fear of being disturbed or disturbing other passengers. This bus will not be monopolized by one person, so that everyone can use these buses to take them to the respective destination.
However, like a bus, if you have too many passengers the way the weight and comfort of passengers would be disturbed (fill in the more crowded bus). The same thing happened in the CDMA network if the network is too full, so what happens is shrinking coverage area (scope or range) and the CDMA network itself. If compared, the more crowded buses fill the space for each passenger will also be narrowed. Not infrequently also a victim of sound quality and full CDMA networks.
CDMA -> Code Multiple Access Divission
This was a refinement of the system TDMA (Time Divission Multiple Access). So, CDMA was his history. 'he' is not directly there gitu aja ... before the existence of a CDMA system called TDMA reply, no reply before another name FDMA, etc. ... etc. ...
If we are talking about CDMA, TDMA, etc. .. etc. .. jg we have to talk about the canal conversation, we talked ttg reply channel conversation, we also need to talk ttg timeslot-timeslot ... long anyway.
CDMA is divided 2: a CDMA FWA (Fixed Wireless Access) CDMA mobile no.
FWA's CDMA product samples esia, flexi, & starone. cellular CDMA reply: Fren. for CDMA Wireless local loop, the number 1 can only be used in 1 area code, for example, for 0651, Banda Aceh, can only be used in banda aceh. can not exit the area code they will be ... except now there yg flexi flexi combonya facilities ...
kalo yg cellular CDMA (Fren); yg CDMA device can function as a cell. (1 number can ganti aja where, like GSM / Cellular) with CDMA tariff.
Briefly CDMA can also be said as the home telephone which can be brought way.
because the most obvious difference from the CDMA & GSM CDMA quote reply is much cheaper than GSM rates.
reply had assumed that CDMA can be used only in-town, now assuming they will be able to say wrong. because Fren be taken outside the city, Flexi be taken outside the city (with flexi facility combo).
Because the tariff is cheaper reply, we've time wisely in choosing ...
kalo rarely out of the city, better use CDMA. except perhaps for no other reason make GSM (eg, low rates of sympathy at 11-7 in the morning, or facilities XL 1 national tariffs, etc. ....)
or use both of them ...
Now, CDMA services in Banda aceh've also pretty good ...
and CDMA jg already have 3G services-called EVDO. so if there is a CDMA operator yg CDMA EVDO product label means tuch udah service supported 3G facility.
CDMA handset vendors also output've started various & begin to compete with GSM. Nokia CDMA handset output have also been supported facilities yg MP3 player, megapixel camera, video recorder, Bluetooth, infrared, etc. ... same like GSM dech ... (nokia 6255, nokia 6275i) has also menluncurkan motorola motorola V3i version of CDMA (thin) Mobi TV & products from Fren.
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