What is gsm techonology?

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What is GSM?

GSM is a technology which is the leading cell phone standard all over the world. In 1982 it was recognized as a standard for digital wireless communications and was first adopted in Europe and then by Asia, Africa etc. The first system was online in 1991 and GSM was formerly known as Group Special Mobile but now stands for Global System for Mobile communications. USA, however has not adopted GSM as a standard and so different carriers now use different technologies as opposed to only GSM. GSM uses digital technology and the methods of time division multiple access transmission. In GSM, sound is digitally prearranged through a special encoder, which imitates the distinctiveness of human speech. This method of transmission allows a very competent statistics speed/information content ratio. GSM is an open system and is a non propriety technology. One of the great benefits of GSM is that it facilitates international roaming. As it is adopted by more than 170 countries, you have the facility of using your GSM cell phone in all these places without having to change your number. GSM satellite roaming has broadened the scope of cellular services even to areas where standard terrestrial services are not possible. GSM is a technology that is rapidly growing and constantly evolving with wireless, satellite and cordless systems offering greatly expanded services. These services include multimedia data services, high speed, inbuilt support for side by side use of these services and faultless incorporation with the Internet and wireline networks. 3GSM (next generation of mobile communications services) is already charted out and will make available services enhancing the already existing voice, data, and text services. GSM will provide video on demand and will help to lessen the gap between wireless and internet/computers. GSM works on different frequency bands across the world. In North America it uses a 1900 MHz frequency whereas in other parts of the world it uses either 900MHz or 1800 MHz. As different frequencies are used in different places, your GSM handset should support various bands so that it can be used globally. From the beginning, GSM has been developed with the need to give its customers utmost security in terms of secure communications, fraud prevention, and call privacy. Today it is the worlds most secure public wireless standard for cellular phones. In an entirely different context, GSM could also stand for grams per square metre. This is the standard measure used for paper, and fabrics.

What services does gsm provide?

GSM SERVICES . GSM services . GSM services are a standard collection of applications and features available to mobile phone subscribers all over the world. The GSM standards are defined by the 3GPP collaboration and implemented in hardware and software by equipment manufacturers and mobile phone operators . The common standard makes it possible to use the same phones with different companies' services, or even roam into different countries. GSM is the world's most dominant mobile phone standard.. The design of the service is moderately complex because it must be able to locate a moving phone anywhere in the world, and accommodate the relatively small battery capacity, limited input/output capabilities, and weak radio transmitters on mobile devices.. Contents . [ hide ]. 1 Accessing a GSM network 2 Voice calls 2.1 How outgoing calls are made from a mobile 2.2 How incoming calls are made to a mobile 2.2.1 Step One: Contact the Gateway MSC 2.2.2 Step Two: Determine how to route the call 2.2.3 Step Three: Ringing the phone 2.3 Voice charges 2.4 How speech is encoded during mobile phone calls 3 Data transmission 3.1 Circuit-switched data protocols 3.2 General Packet Radio Service (GPRS) 3.3 Short Message Service (SMS) 4 Supplementary Services 5 External links . [ edit ] Accessing a GSM network . In order to gain access to GSM services, a user needs three things: . A subscription with a mobile phone operator . This is usually either a Pay As You Go arrangement, where all GSM services are paid for in advance, or a Pay Monthly option where a bill is issued each month for line rental, normally paid for a month in advance, and for services used in the previous month.. A mobile phone which is GSM compliant and operates at the same frequency as the operator. Most phone companies sell phones from third-party manufacturers.. A SIM card which is issued by the operator once the subscription is granted. The card comes pre-programmed with the subscriber's phone "identity" and will be used to store personal information (like contact numbers of friends and family). . After subscribers sign up, information about their phone's identity and what services they are allowed to access are stored in a "SIM record" in the Home Location Register (HLR). The Home Location Register is a database maintained by the "home" phone company for all of its subscribers. It is used to answer queries like, "Where on the mobile phone network is the device associated with this phone number?" and "What services is this subscriber paying for?". Once the SIM card is loaded into the phone and it is powered on, it will search for the nearest mobile phone mast, also called a Base Transceiver Station or BTS. If a mast can be successfully contacted, then there is said to be coverage in the area.. Stationary phones are always connected to the same part of the phone network, but mobile phones can "visit" any part of the network, whether across town or in another country via a foreign provider. Each geographic area has a database called the Visitors Location Register (VLR) which contains details of all the local mobiles. Whenever a phone attaches, or visits, a new area, the Visitors Location Register must contact the Home Location Register.. The Visitors LR will tell the Home LR where the phone is connected to the network (which VLR), and will ask it for a copy of the SIM record (which includes, for example, what services the phone is allowed to access). The current cellular location of the phone (i.e. which BTS it is at) is entered into the VLR record and will be used during a process called paging when the GSM network wishes to locate the mobile phone .. Every SIM card contains a secret key, called the Ki, which it uses to prove its identity to the phone network (to prevent theft of services) upon first contact. The network does this by consulting the Authentication Center of the "home" phone company, which also has a copy of the secret key. (Though the authentication is accomplished without transmitting the key directly.). Every phone contains a unique identifier (different from the phone number, which is associated at the HLR with the removable SIM card), called the International Mobile Equipment Identity (IMEI). When a phone contacts the network, its IMEI is supposed to be checked against the global Equipment Identity Register to locate stolen phones and facilitate monitoring.. [ edit ] Voice calls . [ edit ] How outgoing calls are made from a mobile . Once a mobile phone has successfully attached to a GSM network as described above, calls may be made from the phone to any other phone on the global Public Switched Telephone Network assuming the subscriber has an arrangement with their "home" phone company to allow the call.. The user dials the telephone number , presses the send or talk key, and the mobile phone sends a call setup request message to the mobile phone network via the mobile phone mast (BTS) it is in contact with.. The element in the mobile phone network that handles the call request is the Visited Mobile Switching Center (Visited MSC). The MSC will check against the subscriber's temporary record held in the Visitor Location Register to see if the outgoing call is allowed. If so, the MSC then routes the call in the same way that a telephone exchange does in a fixed network.. If the subscriber is on a Pay As You Go tariff (sometimes known as Prepaid (for example, in Australia)), then an additional check is made to see if the subscriber has enough credit to proceed. If not, the call is rejected. If the call is allowed to continue, then it is continually monitored and the appropriate amount is decremented from the subscriber's account. When the credit reaches zero, the call is cut off by the network. The systems that monitor and provide the prepaid services are not part of the GSM standard services, but instead an example of intelligent network services that a mobile phone operator may decide to implement in addition to the standard GSM ones.. [ edit ] How incoming calls are made to a mobile . [ edit ] Step One: Contact the Gateway MSC . When someone places a call to a mobile phone , they dial the telephone number (also called a MSISDN ) associated with the phone user and the call is routed to the mobile phone operator 's Gateway Mobile Switching Centre. The Gateway MSC , as the name suggests, acts as the "entrance" from exterior portions of the Public Switched Telephone Network onto the provider's network.. As noted above, the phone is free to roam anywhere in the operator's network or on the networks of roaming partners, including in other countries. So the first job of the Gateway MSC is to determine the current location of the mobile phone in order to connect the call. It does this by consulting the Home Location Register ( HLR ), which, as described above, knows which Visitor Location Register ( VLR ) the phone is associated with, if any.. [ edit ] Step Two: Determine how to route the call . When the HLR receives this query message, it determines whether the call should be routed to another number (called a divert), or if it is to be routed directly to the mobile. . If the owner of the phone has previously requested that all incoming calls be diverted to another number, known as the Call Forward Unconditional (CFU) Number, then this number is stored in the Home Location Register. If that is the case, then the CFU number is returned to the Gateway MSC for immediate routing to that destination. . If the mobile phone is not currently associated with a Visited Location Register (because the phone has been turned off or is not in range) then the Home Location Register returns a number known as the Call Forward Not Reachable (CFNRc) number to the Gateway MSC, and the call is forwarded there. Many operators may set this value automatically to the phone's voice mail number, so that callers may leave a message. The mobile phone may sometimes override the default setting. . Finally, if the Home Location Register knows that the phone is in the jurisdiction of a particular Visited Location Register , then it will request a temporary number (called an MSRN ) from that VLR. This number is relayed to the Gateway MSC, which uses it to route the call to another Mobile Switching Center, called the Visiting MSC. . [ edit ] Step Three: Ringing the phone . When the call is received by the Visiting MSC, the MSRN is used to find the phone's record in the Visited Location Register. This record identifies the phone's location area . Paging occurs to all mobile phone masts in that area. When the subscriber's mobile responds, the exact location of the mobile is returned to the Visited MSC. The VMSC then forwards the call to the appropriate phone mast, and the phone rings. If the subscriber answers, a speech path is created through the Visiting MSC and Gateway MSC back to the network of the person making the call, and a normal telephone call follows.. It is also possible that the phone call is not answered. If the subscriber is busy on another call (and call waiting is not being used) the Visited MSC routes the call to a pre-determined Call Forward Busy (CFB) number. Similarly, if the subscriber does not answer the call after a period of time (typically 30 seconds) then the Visited MSC routes the call to a pre-determined Call Forward No Reply (CFNRy) number. Once again, the operator may decide to set this value by default to the voice mail of the mobile so that callers can leave a message..... [ edit ] Voice charges . In the United States and Canada, callers pay the cost of connecting to the Gateway MSC of the subscriber's phone company, regardless of the actual location of the phone. As mobile numbers are given standard geographic numbers according to the North American Numbering Plan , callers pay the same to reach fixed phones and mobile phones in a given geographic area. Mobile subscribers pay for the connection time (typically using in-plan or prepaid minutes) for both incoming and outgoing calls. For outgoing calls, any long distance charges are billed as if they originate at the GMSC, even though it is the Visiting MSC which completes the connection to the PSTN. Plans that include nationwide long distance and/or nationwide roaming at no additional charge over "local" outgoing calls are popular.. Mobile networks in Europe, Asia and Australia only charge their subscribers for outgoing calls. Incoming calls are free to the mobile subscriber; however, callers typically pay a higher rate when calling mobile phones. Special prefixes are used to designate mobile numbers so that callers are aware they are calling a mobile phone and therefore will be charged a higher rate.. From the caller's point of view, it does not matter where the mobile subscriber is, as the technical process of connecting the call is the same. If a subscriber is roaming on a different company's network, the subscriber, instead of the caller, may pay a surcharge for the connection time. International roaming calls are often quite expensive, and as a result some companies require subscribers to grant explicit permission to receive calls while roaming to certain countries.. When a subscriber is roaming internationally and a call is forwarded to his or her voice mail, such as when his or her phone is off, busy, or not answered, he or she may actually be charged for two simultaneous international phone calls—the first to get from the GMSC to the VMSC and the second to get from the VMSC to the Call Forward Busy or Call Forward No Reply number (typically the voice mailbox) in the subscriber's country. However, some networks' GMSCs connect unanswered calls directly, keeping the voice signal entirely within the home country and thus avoiding the double charge. [ citation needed ] . [ edit ] How speech is encoded during mobile phone calls . During a GSM call, speech is converted from analogue sound waves to digital data by the phone itself, and transmitted through the mobile phone network by digital means. (Though older parts of the fixed Public Switched Telephone Network may use analog transmission.). The digital algorithm used to encode speech signals is called a codec . The speech codecs used in GSM are called Half-Rate (HR) , Full-Rate (FR) , Enhanced Full-Rate (EFR) and Adaptive Multirate (AMR) . All codecs except AMR operate with a fixed data rate and error correction level.. [ edit ] Data transmission . The Public Switched Telephone Network (PSTN) is essentially a collection of interconnected systems for taking an audio signal from one place and delivering it to another. Older analogue phone networks simply converted sound waves into electrical pulses and back again. The modern phone system digitally encodes audio signals so that they can be combined and transmitted long distances over fiber optic cables and other means, without losing signal quality in the process. When someone uses a computer with a traditional modem , they are encoding a (relatively slow) data stream into a series of audio chirps, which are then relayed by the PSTN in the same way as regular voice calls. This means that computer data is being encoded as phone audio, which is then being re-encoded as phone system data, and then back to phone quality audio, which is finally converted back to computer data at the destination.. GSM voice calls are essentially an extension of the PSTN, dealing only with audio signals. Behind the scenes, we know these audio channels happen to be transmitted as digital radio signals.. The GSM standard also provides separate facilities for transmitting digital data directly , without any of the inefficient conversions back and forth to audio form. This allows a mobile "phone" to act like any other computer on the Internet , sending and receiving data via the Internet Protocol or X.25 .. The mobile may also be connected to a desktop computer, laptop , or PDA , for use as a network interface. (Like a modem or ethernet card, but using a GSM-compatible data protocol instead of a PSTN-compatible audio channel or an ethernet link to transmit data.) Newer GSM phones can be controlled by a standardised Hayes AT command set through a serial cable or a wireless link (using IrDA or Bluetooth ). The AT commands can control anything from ring tones to data compression algorithms.. In addition to general Internet access, other special services may be provided by the mobile phone operator , such as SMS .. [ edit ] Circuit-switched data protocols . A circuit-switched data connection reserves a certain amount of bandwidth between two points for the life of a connection, just as a traditional phone call allocates an audio channel of a certain quality between two phones for the duration of the call. (But remember that in the GSM system, there is no need to use audio signals to create data connections, even circuit-switched ones. The idea of a circuit-switched data connection being like a phone call is just an analogy to help explain the idea.). Two circuit-switched data protocols are defined in the GSM standard, and they have not-very-creative names: Circuit Switched Data (CSD) and High-Speed Circuit-Switched Data (HSCSD). These types of connections are typically charged on a per-second basis, regardless of the amount of data sent over the link. This is because a certain amount of bandwidth is dedicated to the connection regardless of whether or not it is needed.. Circuit-switched connections do have the advantage of providing a constant, guaranteed quality of service , which is useful for real-time applications like video conferencing.. [ edit ] General Packet Radio Service (GPRS) . A packet-switched connection chops data into distinct chunks, known as packets, which may arrive at their destination via different routes, at different times, out of sequence, or (hopefully only occasionally) not at all. An intermediate protocol, like TCP , might be used to ensure the original data stream is reassembled at the destination (by putting packets in order and retransmitting missing ones, if necessary).. The General Packet Radio Service (GPRS) is a packet-switched data transmission protocol which was incorporated into the GSM standard in 1997. It is backwards-compatible with systems that use pre-1997 versions of the standard. GPRS does this by sending packets to the local mobile phone mast ( BTS ) on channels not being used by circuit-switched voice calls or data connections. Multiple GPRS users can share a single unused channel because each of them uses it only for occasional short bursts.. The advantage of packet-switched connections is that bandwidth is only used when there is actually data to transmit. This type of connection is thus generally billed by the kilobyte instead of by the second, and is usually a cheaper alternative for applications that only need to send and receive data sporadically, like instant messaging .. GPRS is usually described as a 2.5G technology; see the main article for more information.. [ edit ] Short Message Service (SMS) . Main article: Short message service . The GSM standards first defined the structure of a Short Message, and provide a means of transmitting messages between mobile devices and Short Message Service Centres via the Short message service (SMS). SMS messages may be carried between phones and SMSCs by any of the circuit-switched or packet-switched methods described above or, more typically, by the MAP protocol through the SS7 signaling channel used for call setup.. SMSCs can be thought of as central routing hubs for Short Messages. Many mobile service operators use their SMSCs as gateways to external systems, including the Internet , incoming SMS news feeds, and each other (often using the de facto SMPP standard).. The SMS standard is also used outside of the GSM system; see the main article for details.. [ edit ] Supplementary Services . GSM supports a comprehensive set of supplementary services that complement and support the telephony and data services described above. They are all defined in GSM standards. (See GSM codes for supplementary services ) A partial listing of supplementary services follows. . Call Forwarding . This service gives the subscriber the ability to forward incoming calls to another number if the called mobile unit is not reachable, if it is busy, if there is no reply, or if call forwarding is allowed unconditionally. . Barring of Outgoing Calls . This service makes it possible for a mobile subscriber to prevent all outgoing calls. . Barring of Incoming Calls . This function allows the subscriber to prevent incoming calls. The following two conditions for incoming call barring exist: baring of all incoming calls and barring of incoming calls when roaming outside the home PLMN. . Advice of Charge (AoC) . The AoC service provides the mobile subscriber with an estimate of the call charges. There are two types of AoC information: one that provides the subscriber with an estimate of the bill and one that can be used for immediate charging purposes. AoC for data calls is provided on the basis of time measurements. . Call Hold . This service enables the subscriber to interrupt an ongoing call and then subsequently reestablish the call. The call hold service is only applicable to normal telephony. . Call Waiting . This service enables the mobile subscriber to be notified of an incoming call during a conversation. The subscriber can answer, reject, or ignore the incoming call. Call waiting is applicable to all GSM telecommunications services using a circuit-switched connection. . Multiparty service . The multiparty service enables a mobile subscriber to establish a multiparty conversation - that is, a simultaneous conversation between three and six subscribers. This service is only applicable to normal telephony. . Calling Line Identification presentation/restriction . These services supply the called party with the integrated services digital network (ISDN) number of the calling party. The restriction service enables the calling party to restrict the presentation. The restriction overrides the presentation. . Closed User Groups (CUGs) . CUGs are generally comparable to a PBX. They are a group of subscribers who are capable of only calling themselves and certain numbers. . Explicit Call Transfer (ECT) . This service allows a user who has two calls to connect these two calls together and release its connections to both other parties. . [ edit ] External links . BBC 3 Investigates video BBC3 programme "investigates" has undertaken the largest ever survey of the proximity to schools of mobile phone masts in the UK.. GSM Call Flows and Sequence Diagrams Detailed call flow diagrams describing GSM call setup, location update and handover. .

What are the disadvantages of gsm?

Answer . well so far gsm hasn't got a spread spectrum technology, the data packe ts are not coded appropriately thus loss of data

Who first invented techonology?

Answer . Tough question. Technology can be defined as applied science, so the real question is, "when was the first scientific research and experimentation done?" For recorded history I don't know. But I am sure that early man was inadvertently doing science and technology just to improve his survival rate.

What is GSM communications?

GSM stands for "Global System for Mobile communications", which was a replacement for the former AMPS and TDMA (Time Division Multiple Access) formats of analog cellular telephone transmissions. GSM is currently used by over 3 billion people across more than 212 countries and territories, over 82% of the world's population. GSM's advantage over its predecessor is that it is 100% digital, as opposed to TDMA, which was analog. While covering a shorter distance than the analog signal, a GSM signal can carry more voice and data communications than the analog band, and carry it at a faster rate, thus making GSM a "second-generation" (2G) cellular technology. Most GSM networks operate in the 900 MHz or 1800 MHz bands. Some countries in the Americas (including Canada and the United States) use the 850 MHz and 1900 MHz bands because the 900 and 1800 MHz frequency bands were already allocated.

What is the definition of 'information techonology'?

Information technology (IT) is the application of computers andtelecommunications equipment to store, retrieve, transmit andmanipulate data, often in the context of a business or otherenterprise. In easy language: The study or use of systems (especially computers andtelecommunications) for storing, retrieving, and sendinginformation.

How do you jam GSM?

A high power RF emitter wold do the job. However, if you do it successfully, a lot of people will get real upset about not being able to use the GSM networks, they complain and the local radio licensing authority will be out to investigate. Then, you are in huge trouble. Probably not wise to do it.. Alternatively, if it is to prevent GSM devices being used inside a building, a Farady cage might work. It is made of metal sheets that enclose a room or building, all connected to each other and all connected to ground. Effective, but expensive and it cuts out all other RF signals as well.. Answer . For "local" control of the airwaves, a low power transmitter can be used as a "jammer" on these frequencies. That will allow z"quiet" in areas that one wishes to control things. A movie theater, perhaps. But any attempt to "push the envelope" will be met with Federal force. Check around before running loose on this.. The FCC controls the airwaves, and they aren't very patient with the patent infringement of the rights of mobile communicators to use those airwaves. And they have a little van with a couple of geeks in it to track you down. They're well equiped and good at it.. Trying to seal a building against electronic communication is difficult and expensive, particularly if you have "variable" openings in it where people and/or vehicles are coming and going.

What is gsm uplink?

Hi,. For every GSM band there are Uplink and downlink frequencies.. Example:. GSM 900 TX: 880 MHz to 915 MHz is an uplink frequency range. GSM 900 RX: 925 MHz to 960 MHz is a downlink frequency range. Aloha,. Maverick

What is E-GSM?

E-GSM is the band of frequency in a small radio or a wireless phone. The band is 880-A890 MHz small radio frequency band used in Europe to provide added network capacity for GSM 900 networks.\n\n\n\n

What is the importance of GSM?

Majority of the carriers worldwide use GSM technology, wherein SIM cards are utilized to store information, like contacts, and data. With this technology, it's just easy to use different phones without losing data or contacts.

What is the GSM?

GSM Stands for Global System foe Mobile Communications.It uses TDMA and FDMA accessing techniques for effective utilization of frequency spectrum.

Why is the gsm 900 better than gsm 1800 and gsm 1900?

As the frequency increase its penetration power decreases.The signal travels a lesser distance.Hence for a perticular area more no of towers need to be erected in 1800/1900 than in 900MHZ for full coverage...Hence vodafone( 1800MHZ) has more towers per unit area than Idea Cellular ( 1800+900) ..... Band of 900 is from 890-915( uplink) 935-960Mhz( downlink).... Band of 1800 is from 1710-1785(uplink) and 1805-1880MHZ(Downlink).... Same property is followed here.....The uplink is lower ( MOBILE -BTS) than the downlink frequency (BTS-MOBILE)...so that this may help the uplink signal to travel futher without consuming much power...BTS due to its increased power ,has higher frequency to tavel the same distance....

What is techonology?

why is technology the best for us? think for a moment, what it might be like to live in the 9 century. Imagine that u could travel back in time and found yourself in small Asian country like China. How would us cook Ur food? would u use gas, microwave or oven? How would you go from one city to the next? could you get on a train or would you have to walk or ride a horse? How would sent a message to ur parents telling them u'll be late for launch or dinner? How email to ur friends or calling them on ur cellphone? I say it's impossible unless we have technology. Now contemplate for a while how different everything would be if u were to live in the 9 century. many items we use today are a result of modern technology. out cellphone, microwave, vehicle, Internet are all the outcome of scientific discoveries that brought in our community by the great efforts of our inventors or engineers that tried their best to bring a peace living or people to live comfortably. ........

How did Romans use techonology to improve life in the empire?

The Romans used technology to develop engineering. Engineers built roads, bridges, and harbors throughout the entire empire. They also built aqueducts to improve public baths(hygiene.)

What is information techonology?

Information technology is the study of technology that handlesinformation. It is also a department within a business that handlestechnology.

What are advanteges of GSM?

There are many benefits to GSM phone service and perhaps the best is that you can use cell phone with other provider. It is nice when using a cell phone that you can call whoever you want wherever you want and never think twice about changing mobile phone network or what frequency the phone is using. Everything just happens naturally, and that is certainly a benefit. And if you travel internationally you can still use your phone. This is where GSM comes into play and why it is so important to have a GSM cell phone. . You would get your GSM phone that is a Quad Band phone. In summary, a Quad Band mobile phone is used to designate a phone that can operate in the following GSM frequency bands : . 850 MHz (U.S./Canada/Latin America/Brazil (Only the carrier Vivo in the south and south-east of Brazil)) . 900 MHz (Africa/Europe/Brazil/Australia/Asia (ex Japan and S. Korea)) . 1800 MHz (Africa/Europe/Brazil/Australia/Asia) . 1900 MHz (U.S./Canada/Latin America/Brazil (Only the carrier Vivo in the north, north-east and centre-west of Brazil)) . These are also called World phones. These phones come unlocked and can be used with any carrier that uses a GSM network by changing the SIM card to the phone. To view some types of these phones go to: http:/nextlevelcellular.ecrater.com

What is the definition of information techonology?

Information technology is the use of computers and telecommunications to store, send, and retrieve information.

Gsm 900 vs gsm 1800?

GSM-900 and GSM-1800 . GSM-900 and GSM-1800 are used in most parts of the world: Europe, Middle East, Africa, Australia and most of Asia. In South and Central America the following countries use the following:. * Costa Rica - GSM-1800 . Brazil - GSM-850, 900 and 1800 . Guatemala - GSM-850, GSM-900 and 1900 . El Salvador - GSM-850, GSM-900 and 1900 . GSM-900 uses 890-915 MHz to send information from the mobile station to the base station (uplink) and 935-960 MHz for the other direction (downlink), providing 124 RF channels (channel numbers 1 to 124) spaced at 200 kHz. Duplex spacing of 45 MHz is used. Guard bands 100 kHz wide are placed at either end of the range of frequencies [1] .. In some countries the GSM-900 band has been extended to cover a larger frequency range. This 'extended GSM', E-GSM, uses 880-915 MHz (uplink) and 925-960 MHz (downlink), adding 50 channels (channel numbers 975 to 1023 and 0) to the original GSM-900 band. The GSM specifications also describe 'railways GSM', GSM-R, which uses 876-915 MHz (uplink) and 921-960 MHz (downlink). Channel numbers 955 to 1023. GSM-R provides additional channels and specialized services for use by railway personnel. . All these variants are included in the GSM-900 specification. . GSM-1800 uses 1710-1785 MHz to send information from the mobile station to the base tranceiver station (uplink) and 1805-1880 MHz for the other direction (downlink), providing 374 channels (channel numbers 512 to 885). Duplex spacing is 95 MHz.. GSM-1800 is also called DCS (Digital Cellular Service) in the United Kingdom, while being called PCS in Hong Kong [2] (not to mix up with GSM-1900 which is commonly called PCS in the rest of the world.) .

What is a GSM and how does it work?

Gsm is a mobile coverage statement. Some of the gsm carriers are in lists on google. If you have a phone that is gsm capable, then get a gsm carrier SIM card that has your plan, and insert it into the phone. Then you will have to activate it, and it will work just like you bought it from the carrier.

What is a GSM modem?

GSM is the world's most popular standard for mobile telephony systems. GSM modem connect your computer to that. Allow computer to make cellphone call. And required sim.

What is GSMS?

this is where the chemical CG and MS come together to make GSMS, they can also can be taken away (separated) to be identified

What GSM stands for?

previously GSM stands for Groupe Special Mobile in US .since GSM is accepted as worldwide standard for mobile communication it was stated as Global System for Mobile communication.

Impact of information techonology on commumication?

Information technology(IT) has had a huge impact on communication. Can you imagine where communication would be if we didnt have telephones, cellphones, pagers, etc ? IT has also given us ways to make our communications faster. Anything that is actually related to communications or the way communications has improved in last 20+ years, is all due to IT.

Techonology that you did not have fifty years ago?

Students fifty years ago did not have any technology except simple things like light bulbs and black & white televisions. There were rodary dials instead of cellphones , which were invented in the late 1970's. There were Nintendo's back then but they were only small and hard to use, and now they have Nintendo Wii's ! There were black and white televisions , and now replacing them there is wide, massive flat-screens with better definition, which is now called HD (high definition). There were gramaphone's used to play music and now there is an iPod .

Is techonology boon or bane?

i dont no do i kid bone bane i dont really care why do u want to no this but i think its bane happy? u better be

What are the new trends in computer techonology?

The new trends in computer technology today are: LCD monitors, cool and high-performance monitors, extended capacity of memory and graphic cards as well.

What are the negative or positive effects of techonology on the family?

It really depends on your situation at the moment. If you are currently living in some sort of Amish lifestyle, I really wouldn't want you to go exploring the technology the past 3 centuries have brought. On the other hand, I'd ask myself how you'd be asking us this question. While sometimes technology might lessen the communication between direct family members, due to the attractiveness of playing a game or surfing the internet on your own, it will encourage more long distance relationships. On the other hand, it might enhance the quality of your family relations, as you might experience during a nice multiplayer game on your Wii * . But as I said, it really depends on your current situation. Other answers might help you get some more insight into the issue. * Be sure to include your black neighbour, your Asian housemade, and other members of your multicultural society of alls races, creeds and ages in order to fully experience it.

What is happening in information techonology now?

Think about it... We have twitter, facebook, myspace, and soooo many other ways to connect right? Think about that and now think about the search engines we use to find out things Google, yahoo, bing etc. Combine all of those resources in say "your cell phone" and what do you have? The ability to find out virtually any and everything you so desire with the assistance of your 4 inch compact device. We can ask the web or someone from our social networking sites anything and chances are someone will know whatsoever you ask. Info tech is morphing into something that i like to call "Your makeup" These things that we wish to know or already know will one day be "embedded" with who we are. These are the dinosaur years for that kind of "total control integration" Were getting close though.

What does gsm mean-measurement of paper?

GSM means Global System for Mobile Communications. This is the most commonly used technology by the carriers or network providers worldwide. However in paper production, it refers to Grams per Square Meter. Normallly, the higher the GSM, the thick the sheet of paper.

What does 80 gsm paper mean?

GSM means grams per square meter in measurement. It is the measure of the weight and type

How does a GSM Gateway work?

GSM Gateways work by inserting a normal Mobile SIM Card into the device, and once signal has been found the device is cabable of routing numbers out via the SIM Card. The typical solution would be to route mobile calls via the SIM card, effectively turning the call from Landline to mobile, to Mobile to mobile, cutting the cost by over half. GSM Gateways come in various different shapes, sizes and languages, by languages I mean protocols, e.g. ISDN30e/PRI, ISDN2/BRI, Analogue and VoIP Including H.323 and SIP, depending on what is needed for the company. For example, for a typical 2 person company, the most cost effective would be the analogue device and connect this to the original analogue line (just like your home phone) GSM Gateways also come with other features including inbound routing, Mobility solutions and overseas solutions - but we wont get into that, its much more technical - I should know, I installed them for a living!

Why is techonology bad in the classroom?

Technology can be bad in the classroom because kids may get distracted if they are using cell phones or iPods, but I feel that computers, Elmos, Smart Boards, Star Boards, etc. are good for students to learn about technology.

Why does Microsoft Access hide important database techonology?

I am not sure Access hides anything. If you have a hidden agenda in this question, please ask another, more specific question to receive a meaningful answer.

What is future of GSM?

The Limitations of GSM However, GSM is a technology of the mid 1980s where the only usage envisaged for a mobile phone is that of transmitting and receiving voice data. In fact, basic GSM phones only send and receive data at an apalling transmission rate of 9.6 kbps (kilobits per second). However, as mobile phones have grown into multimedia devices and text messaging has proved to be the 'killer app' - the one usage that brought mass appeal to mobile phones - then the data throughput limit has proved to be a real bottleneck. It's even possible to access the text content of web pages that have been converted to WAP (Wireless Access Point) format with a GSM phone. Unfortunately, due to the slow data transfer of GSM phones it can actually take several minutes to download even a WAP-converted page to your phone. In Japan this limitation was overcome by the DoCoMo company with their extremely successful I-mode range of mobile phones which can transfer data at ten times the speed of standard GSM. Standard GSM uses circuit switching as a means of data transfer. This means that the phone must make a dedicated connection with the base station thus tying-up the channel completely for that phone. In contrast, I-mode uses technology borrowed from the Internet, called packet switching where the transferred data is broken up into blocks called 'packets'. Each packet is labelled with the address of the final destination and any packet can be transferred on any available channel and no channel is dedicated to any telephone. Because of this data transfer proceeds at a much, much, higher rate. Not only are downloads quicker, but as the phone is only connected to the network when a package of information is being sent users pay for the amount of data they have sent rather than for the total time they remain connected. It is planned that all GSM networks will move to packet switching technology, which can only be of benefit to customers and it envisaged that data transfer rates will reach up to 171 kbps with the introduction of a system called GPRS ( G eneral P acket R adio S ervice) which not only splits the mobile phone call into packets but also allows each phone to use several channels which are shared amongst many users. Thus not only is data transfer speed increased but overall throughput is also increased. Beyond GSM - 3G 3G, which stands for 'Third Generation' is the great white hope of many mobile operators. The International Telecommunication Union (ITU) has defined the demands for third generation mobile networks with the IMT-2000 standard. An organisation called 3GPP has continued that work by defining a mobile system that fulfils the IMT-2000 standard. This system is called Universal Mobile Telecommunications System (UMTS). The first stage in the evolution of GSM to UTMS is the introduction of GPRS to all GSM services. Another advance in 3G systems is CDMA ( C ode D ivision M ultiple A ccess) which allows a single 'burst' of data to carry several signals simultaneously. This further compresses the amount of data that can be sent in a single data burst and, theoretically at least, allows for a maximum data transfer rate of up to 2 Mbps (megabits per second). It is this increased data transfer rates that allows 3G services to deliver video to its subscribers and which should also allow video messaging between 3G mobile phones. It is the hope of the nascent 3G providers that this video communication will be 'killer application' that drive through the sales of 3G phones and systems (just as texting did for GSM).

What is ciphering in gsm?

Ciphering is encyption and decyption of user ID in GSM network. It is done inside GSM GPRS component SGSN.

What is an e1 in gsm?

e1 is a standard unit used to measure the amount of data flow. 1 e1 refers to 2mbps speed of data flow.

How will you convert weight of a garment of 200 GSM to 220 GSM?

Add 20 grams per square metre of the fabric. This could be in the form of embroidery, for example.

Types of information techonology ststems for which failure would be catastrophic?

Failure of safety critical systems can be catastrophic. like a fire alarm system in a building.

What is 3G techonology?

3G stands for 3rd generation of the GSM technology. GSM is global system for mobile communication which connects all mobiles using wireless network. In initial ages GSM technology was only transfering of speech i.e voice calls. that was the first generation of GSM. IN second generation of GSM we have Voice calls + SMS services(short messaging services)+ GPRS (slow internet connection upto 32 KBps approx). At present we in India have been using upto 2nd generation of GSM technology. Now as the auction for 3G is over and services are on the way to go.We will have features of 2G + fast internet connection upto 16MBps or may be more than this+awsome features of DATA and related applications as a developer to some extent to create client specific customized features with faster response from network. Regards Aditya Sharma

The difference between old and new techonology?

the new technology is more advanced than the old technology. for instance the old whisk to make juice has been replaced with an electronic blender.

What is science and techonology?

Science is a system of statements based on direct experience, and controlled by experimental verification. There are many sub-subjects such as anatomy, geology, astrophysics, biology, and paleontology. Technology is how we use electric things that help us explore the micoworld and out to the farthest galaxy.

What is the meaning of techonology?

Technology: The application of science, math, engineering, art, and other fields of knowledge to create tools and implementations deemed useful by a society..

In which name gateway techonologies is known today?

The compnay formally known as Gateway Computers then as Gateway Technologies was bought out by Acer and is now known as Gateway Incorporated.

Why GSM has to be Encrypted?

encyption prevents unauthorized access to the data that is transferred, that is the speech, or sms and so on

Why gsm 900 better coverage than gsm 1800?

Because the power for the sector (Cell) is same the distace coverager nearly equal to power divide to frequency.

Which is thicker 130 gsm or 100 gsm?

In the context of Mobile phones gsm means Global System for Mobiles. Hoerver 100 gsm or 130 gsm is usually referred for thickness of paper. gsm means grammes per square meter. Hence 130 gsm is thicker than 100 gsm. Simple.

What is a example of a common techonology that does not efficiently convert energy Explain?

1. A car. Perhaps 30% of the energy in the gasolene is converted to movement energy. The remainder is wasted as heat. 2. The incandescent light bulbs convert a large portion of the electricity into heat - when usually the desired output is light. Fortunately, this type of bulb is gradually being replaced by more modern technologies.

How do you make GSM?

GSM is a way to communicate between a computer and a GSM-GPRS system. This is used mobile communication in most countries it enables higher data transmission rate.

Who created techonology for war?

Technology for War wasn't invented by one person. War Tech was invented throughout the years: - Stones - Metal weapons - Guns - Modern Weaponry So actually, many people have given a part of their life and devoted it to creating weapons.

What is the differentiate science from techonology?

Science is knowledge about the physical world. It also describes the process we use to get that knowledge. Technology is the cool stuff we make with that knowledge.