What is the difference between GSM and CDMA?
449868
GSM is Global System for Mobile Communications\n\nIs the most popular mobile phone protocol standard and it is based on a time division multiplexing \n\nCDMA is Code Division Multiple Access \n\nWas (when I was a student, I do not know what is its state now) an experimental protocol that used frequency division multiplexing.
128511
(Enhanced Data rates for Global Evolution) An enhancement to the GSM and TDMA digital cellular phone systems that provides data transmission up to 384 Kbps. Like cellphones in general, the EDGE service is more ubiquitous for mobile users than searching for Wi-Fi hotspots; however, data rates are much lower than Wi-Fi. To obtain the service, you have to add an EDGE modem to your laptop and sign up with a cellular phone provider that provides it such as Cingular Wireless. See UWC-136, Wi-Fi, GSM and TDMA.
339013
the GSM= General Service Medal.  More information regarding the medal can be found by going to the link below
81976
Depends on which type of connection u are using. If you are using the GSM service. Then you have to buy a GSM gateway which basically the GSM gateway will act like a Mobile Phone. \n\nAnd depends on which brand u are using . Most of them provide you with the complete coverage over their API.\n\n......\n\nAlso depends on what you try to do. Sending SMS by using Sim card connect to GMS gateway not the best option to send a bulk messages.  It is reliable at one level but once the traffic gets abit busy, then u realize the lack of services and SMS won't gets delivered or something. \n\ni guess you can buy bulk messages from services like \nclickatell.com\n\nThey provide you with a wide varieties of protocal and API to choose from. Either you wanna send SMS from .net application, web application, SMTP or FTP protocol they have it all .
102170
SMS Gateway is a software utility that enables you to easily send and receive text "Short Messages" over GSM cellular telephone networks from your local PC or through the network.\n\nSMS GATEWAY is a service through which companies can instantly and cost - effectively send information to any number of GSM mobile phones in the world. SMS GATEWAY works simply by connecting server to the client database. The client supplies the destination GSM number, message content (text or binary), and an optional identification number for tracking purposes.The sms gateway software then converts the data into SMS format and sends the message to any number of mobile phones.
104686
MMS or Multimedia Messages work much the same as your average text messages. The only real difference is that the message is sent to a server before it it sent to your phone.Here the data is stored for a period time before deletion (from the server that is).It is from this server that you actually download the message contents. Also if you fail to recieve the message you can always go back and try to retrieve the message again.
196888
It's hard to say.  They each have there good and bad.  Cingular I use and like, but sometimes the reception is really bad.  I heard that nextel receptions is really good, but where can you get roll over.
296151
No difference, AT&T bought out SBC. Protection of your pc is mainly your responsibility.
505575
The introduction of second-generation (2G) mobile radio (Global System for Mobile Communications/GSM) triggered a veritable boom in wireless communications. In the early 1990s, car telephones and similar mobile communications phones were largely reserved for special groups of users.\nBut by the end of the decade, nearly every second person owned a mobile phone. Initially, mobile phones were primarily used to make phone calls or send and receive short messages (SMS). By the late 1990s, however, there was also a growing demand for using mobile phones to send and receive\ndata, e.g. to or from a PC. Being able to check e-mail was a convenient way of staying up to date, especially for professional users on business trips.\nToday, this has more or less become standard. However, the data rates for the GSM standard, which was designed primarily for mobile phone communications, are in the order of 9600 bit/s. This is quite sufficient for simple text e-mails without any attachments. If large files are attached,\nhowever, this data rate is too low. Browsing the Internet is also possible using this standard, but doing so is expensive and tedious. With the introduction of 2.5G mobile phones (General Packet Radio System/GPRS),\nthe available data rate was increased to 171.2 kbit/s by means of\npacketizing, i.e. by combining GSM timeslots. But it was only the third generation of mobile radio – the Universal Mobile Telecommunication System (UMTS) standard – that brought about a significant increase in data rate now measuring 144 kbit/s up to 384 kbit/s or 2 Mbit/s, where the actual\ndata rate largely depends on the conditions surrounding reception or coverage in each case. The Enhanced Data Rates for GSM Evolution (EDGE) standard with higher-order modulation (8PSK) also makes it\npossible to achieve higher data rates of up to 345.6 kbit/s (ECSD)
379417
ok, here, i'll explain, in much better etail than the other 2 answers. \nA dial-up modem is really nothing more than a telephone. only, it is programed to interpret certain sounds/electrical signals that come from the telephone as somthing that your computer can understand. because of this, it does act as a telephone call, thus, you cannont make any calls on that line. \n\na DSL modem is basically the same thing, believe it or not. it still uses your phone line, but, it uses a different frequency to transfer information. it uses a higher frequency of the phone line, like the fast and slow lanes of a highway. but, the major difference between the dial-up modem and the DSL one right now is that the DSL modem has to be configured to recieve these high frequency messages.\n\na Cable modem is completely different from both dial-up and DSL modems. a cable modem uses a different wire, instead of a telephone wire, it uses a digital coaxle wire. this wire supports more data transfer at a time than phone wires do, thus, you may get higher speeds of interent.\n\nnow, there is one last thing that is usually overlooked. as you probably know, you have 1+ telephone wire per a house. and this wire, never joins with other wires. thus, it is alwayse only you on your phone, nodoby else. because of this, DSL's speed of internet remains relativly the same throught the day. However, the coaxle cable that you have for a cable modem joins togeather with everyone in your community, so, if more people are on the internet in your community, then your connection will be slower. so, at different times during the day, your connection may be slightly faster of slower, depending on how many other people in your community are on the internet.
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Frequency hopping consists in changing the frequency\nused for transmission at regular intervals. It has been introduced in GSM mainly in order to deal with two specific problems which affect the tranqmission quality:\nRayleigh fading: The radio signals are subject to fading,\nwhich is approximately Rayleigh distributed. For a slow\nmobile, a fading dip may cause a severe information\nloss. Frequency hopping will spread sequential information\nin the frequency domain. Since the Rayleigh fading\nis frequency selective, frequency hopping will cause frequent changes of the fading, thus reducing the risk of\nlosing sequential information. Introducing this frequency\ndivers& will, together with the interleaving and coding,\nimprove the transmission link quality, for slow mobiles\nin particular.\nIntegerence: Without frequency hopping, strong signals\nfrom neighbor cells transmitting on or close to a carrier\nfrequency will affect the carrier signal continuously,\nwhich may negatively affect the transmission performance.\nFrequency hopping will cause different signals to\ninterfere with the carrier at different times, a property\ncalled interference diversi9. On system level, the result\nis a “smearing” of the interference between users, an\neffect often called inteference averaging. Furthermore,\ninterference diversity gives a second effect, which is\nemphasized in this paper. Since sequential bursts of\ninformation are received under different interference\nconditions, the risk of a sequential information loss is\nreduced. This, together with the interleaving and coding,\nwill improve the transmission link quality.
114670
Not quite sure exactly what you are looking for but here goes.\nTelecommunications has really changed over the last few years. A LD Call that cost $2 per min. now cost 1/10 the price. Telecommunications has become a commodity all using the same equipment and services, therefore the only difference then is communications between the provider and user.
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You can find all of the relevant standards for GSM and the WCDMA form of 3G on the 3G Partnership Project website at http://www.3gpp.org/specs/numbering.htm. For understanding selection of the base station, look at the 05.08 spec. under http://www.3gpp.org/ftp/Specs/html-info/05-series.htm. This applies specifically to GSM.\n\nIn general, GSM uses a form of ALOHA called "slotted ALOHA" to govern the random access portion of the network access initiation protocol.\n\nCheck out http://www.ee.surrey.ac.uk/Personal/L.Wood/constellations/tables/gsm.html for some overview on GSM. Also http://kbs.cs.tu-berlin.de/~jutta/gsm/js-intro.html.\n\nGoogle "GSM random access protocol" for more papers on Slotted ALOHA.\n\nGoogle "GSM network registration" or "CDMA network registration" for more on the process of finding and registering to the network.\n\nNote that CDMA comes in multiple forms, WCDMA being the 3G extension of GSM and CDMA 2000 being another variety. There may also be other varieties of CDMA...
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There are two kinds of cellphones- GSM (Global System Mobile) and CDMA(Code Division Multiple Access). GSM SIM cards can be removed and installed in another GSM handset. \n\nCDMA phones dont have a similar SIM card, they are kind of hardwired. \n\nFind out if it is GSM, then u can do it.
363414
it uses mobile wireless communication to communicate with other modems/receivers. It operates through GSM frequency, the same frequency GSM mobile phones use.
692657
wireless application protocols (WAP), 3g, gprs etc... mostly using gigahertz frequencies under environmental health spectrum, around 3.5GHz.... these spectrum also covers radio waves and microwaves, some transmitted via satelites.
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from phonescoop.com\n  UMTS   \n   \n  Universal Mobile Telecommunications System.\n\nA third generation (3G) mobile communications technology that promises data transmission speeds of up to 2 megabits per second (Mbps), although actual speeds may be significantly lower at first, due to network capacity restrictions.\n\nUMTS used WCDMA technology, and the two terms are often used interchangeably with each other.\n \n\n \n not sure how UTRANS is different, but here : http://academic.algonquincollege.com/students/raha0015/clients/utrans-web/experiences.html