Excuse me, what is the SIM interface?

Category: Computer/Network >> Hardware

Analysis:

1, GSM group Speciale Mobile(GSM) is a circuit-switched system, while GPRS is a packet-switched system. GPRS is especially suitable for intermittent, sudden or frequent, small data transmission and occasional large data transmission. We can understand GPRS as a higher level of GSM.

2.MMS is the abbreviation of (multimedia message service), which means multimedia short message service in Chinese. Its biggest feature is that it supports multimedia functions. Multimedia information makes the transmission of content and information have comprehensive functions, including multimedia information such as images, audio information, video information, data and text, and can support various high-speed data services such as voice, Internet browsing, e-mail, conference TV and so on. With the support of GPRS network and WAP wireless application protocol as the carrier, video clips, pictures, sounds and texts are transmitted. Multimedia message service can realize instant multimedia information transmission from mobile phone end to end, from mobile phone terminal to Internet or from Internet to mobile phone terminal.

MMS information is compressed in a standard way, so the receiver can confirm the content format it does not support and process it in a controlled way. This is also a method to solve the problem of Internet content interaction.

The media types supported by MMS standard are: JPEG, GIF, text, AMR voice and other non-mainstream formats. In order to get better interactivity, Nokia and other manufacturers have drafted a "MMS conformance document", which lists the minimum set of content types that MMS phones can support.

3.* * *, also known as polyphony, refers to the sum of the pronunciation numbers of each channel in MIDI, which is different from * * * in music theory. * * * * * The timbre is richer, and the three-dimensional effect is stronger than the previous single tone * * *. At present, there are 4,/kloc-0, 6, 24 and 40 mobile phones in China.

MP3(MPEG Audio Layer) is an efficient compression technology based on high fidelity. It uses a special data compression algorithm to process the original audio signal, so that the size of the digital audio file is only one tenth of the original, but the music quality has not changed, almost close to the quality of CD. MP3 *** is to use MP3 as a mobile phone.

4.MP3 function means that the machine can play MP3 songs like an MP3 player; The radio can listen to the radio like an ordinary FM radio. These don't need the internet.

The so-called Bluetooth technology is actually a short-distance wireless communication technology. Bluetooth technology can effectively simplify the communication between mobile communication terminal devices such as palmtop computers, notebook computers and mobile phones, and can also successfully simplify the communication between these devices and the Internet, thus making the data transmission between these modern communication devices and the Internet faster and more efficient, and broadening the road for wireless communication. More generally speaking, Bluetooth technology enables modern portable mobile communication equipment and computer equipment to access the Internet without cables, and its practical application can be extended to various household appliances such as automobiles, consumer electronics and information appliances, forming a huge wireless communication network.

He can use Bluetooth function to communicate between mobile phones or computers, just like infrared ray, which is convenient and fast enough.

6.EMS (enhanced short message service) means enhanced short message service in Chinese. Compared with SMS, it has the advantage that it can not only send short text information like SMS, but also send simple information such as images, sounds and animations. Its greater advantage is that EMS can still run on the GSM network where SMS was originally run, and there is no difference in sending mode and operation method. The standard is open, so any third-party company or individual interested in EMS can develop application software and services on this platform. However, due to the incompatibility of technologies of mobile phone brands, the above-mentioned mutual transmission can only be realized between mobile phones of the same brand in actual use, and the practicability needs to be further improved.

7.EFR is an enhanced full rate, which improves the full rate. Turning on this function can make the sound of the mobile phone clear. Nokia's 6 1 10 is the first mobile phone equipped with this function, and now almost all mobile phones automatically turn on this function;

STK is a Sim toolkit, SIM card toolkit, which is an enhanced SIM card and has been opened in many cities. This card adds another item to the mobile phone menu, such as mobile banking, public information and so on.

EFR:EFR enhanced full rate, a GSM network voice coding method, is used for voice coding and transmission of GSM mobile phones based on 13Kbps full rate, which can obtain better and clearer voice quality (close to Qos4.7), and requires network service providers to open the mobile phones with this network function. If your GSM network supports this function, this function will be turned on automatically. Let the voice be clearer and hear more clearly!

STK: STK:STK(SIM TOOL KIT), abbreviated as "User Identification Application Development Tool", can be understood as a set of commands for developing value-added services, a small programming language that allows SIM, a user identification module based on smart cards, to run its own application software.

STK card is not an ordinary SIM card, but a Simera32K card based on Java language platform. STK is a small programming language software that can be solidified in the SIM card. It can receive and send GSM short message data as an interface between SIM card and short message, and it also allows SIM card to run its own application software. These functions are usually used to replace the mechanical "dial-answer-answer" mode with a friendly text menu on the telephone display screen, which can be activated by software, thus allowing users to easily carry out complex information retrieval operations or transactions by pressing keys. SIM card technology, over-the-air download service, and services based on SIM cards, such as Monternet SIM card and M-Zone, are all SIM cards based on STK technology, which can make SIM cards have large storage capacity and built-in services provided by operators.

STK can be understood as a set of commands for developing value-added services, a small programming language that allows SIM cards based on smart cards to run their own application software.

STK technology is mainly used in mobile banking, stock trading, foreign exchange trading, financial secretary and other fields. This technology is used in new mobile services such as "mobile banking" and "stock inquiry and trading".

STK card, like the original SIM card, can be used on ordinary GSM mobile phones. The difference is that STK card is a new generation of smart card with high storage capacity. Users only need to pay a fixed fee every month after replacing STK cards at GSM outlets (different provinces).

8. The functions and contents of mobile phones with JAVA extensions are richer than those of other mobile phones that don't support JAVA!

That is to say, a mobile phone supporting java can download some java software to realize some functions that the machine itself does not have!

For example, Siemens 2 128 itself has no function of sending and receiving emails, but as long as you download a JAVA tool software for sending and receiving emails. In the future, just go directly to the JAVA tool on your mobile phone, enter your account number and password, and you can send and receive emails!

In short, JAVA has n kinds of functions, except e-books, * * * editors, phone book managers and electronic maps. ....................

9. As a small portable digital device, mobile phone has the advantages of portability and powerful functions, but its storage capacity is not large, so it is necessary to store the files in the mobile phone into the computer from time to time, which involves the connection mode with the computer. Data transmission interface is the interface between mobile phone and other devices such as personal computer. With this interface, other devices can realize upload and download, data synchronization and other functions. Common data transmission interfaces include USB interface, serial port, infrared data association and Bluetooth interface.