38, SMS
SMS (Short Messaging Service) is: SMS service. Is the earliest short message business, is now popular
A short message service with the highest rate, through it, mobile phone can send and receive text messages, the content is text, numbers or
Binary non-text data is mainly, currently, the length of this short message is limited to 140 bytes. SMS is simple and convenient
The use function is welcomed by the public, but it is always the first generation of wireless data services, and there is a technique in content and application.
Standard limitations.
39, EMS
EMS (Enhanced Message Service) enhances information services, SMS new version. The advantage of EMS is in addition to
Outside SMS, you can send information such as simple images, sounds, and animations, and still
There is no difference in transmission paths and operations on the network running in the original SMS. This standard is open, any pair
Third-party companies or individuals interested in EMS can develop applications and services on this platform. But due to various mobile phones
There is a technical incompatibility situation in the card, which often can only achieve the above mobile phones in the actual use.
Transfer each other, so practicality is greatly reduced.
40, MMS
MMS is the abbreviation of Multimedia Messaging Service, in Chinese as multimedia information service, also known as "color
Letter, is the latest business of the standard development of multimedia information in accordance with 3GPP standards.
The big feature is to support multimedia functionality, can be WAP wireless applications with GPRS, CDMA 1x, 3G, EDGE
The protocol is a carrier to transfer video movies, pictures, sounds, and texts. In addition to being transmitted between mobile phones, it can be hand
Transfer between the machine and the computer. The uniqueness of mobile phones with MMS functions is its built-in media editor, use
The household can easily write multimedia information. If you install a built-in or external camera, the user can make
PowerPoint format information or electronic postcard and transfer them to a friend or colleague. At present, this application service has been
Going to mature, gradually become the mainstream SMS format.
41, CF card
The full name is "Compactflash" (CF: Compressed Flash) is the world's smallest mass storage device, and 1994 is first launched by SanDisk. The CF card has the PCMCIA-ATA function and is compatible with it; the CF card is only 14g, only the cardboard blade size (43mmmmmmmx3.3mm) is a solid product, which is still no moving parts (of course, when it is not working. ). The CF card uses flash (flash) technology, is a stable storage solution that does not require a battery to maintain data stored therein. For the saved data, CF cards are more secure and protected; 5 to 10 times higher than the traditional disk drive and the III PC card, but the electricity of the CF card Only 5% of the small disk drive. The CF card uses any voltage between 3.3V to 5V (including 3.3V or 5V), and other mini flash cards can only use 3.3V or 5V power. The CF card 50 is used, but it is easy to insert into the 68-pin II adapter card (tank) (fully satisfying the PCMCIA Electromechanical Interface Technical Requirements). The connector used by the CF card is similar to PCMCIA. After a few years of practical use of users on portable devices, the reliability and durability of the CF card have been proven, although the CF card is frequently swapped in such devices; other forms of small flash card reliability and Durability is not as follows. The CF card storage capacity is 4MB, which is a lowest power consumption flash solution because the built-in controller makes the CF card use a variety of low-energy flash memory technology; this host uses CF cards, saving other memory cards than the other memory cards energy used. Currently, some smartphones use this as a memory card. 42, SD card
The SD (Secure Digital Card) card is a data memory card developed by Japan Panasonic, Toshiba and SanDisk in August 1999. Its data transfer and physical specification have been developed by the MMC card, which is more than the MMC card with a secret certificate (SDMI specification) that performs data copyright protection. The size and MMC card are different, the size is 32mm × 24mm × 2.1mm, the length width and the MMC card are just 0.7mm, and the capacity is much larger, which is mostly used for MP3, Digital Camera, E-Book, Mini Computer, AV Equipment Wait, some smartphones use this as a data memory card.
43, SIM card
Subscriber Identity Module, ie the user identification card, is a "smart card" in line with the GSM specification, the SIM card has the size of the size, the size of the size of 54mm × 84mm (about business card size), the small card size is 25mm × 15mm (still smaller than ordinary stamps). In fact, the "big card" really plays the "small card", "small card", "small card" on it, only the small finger is so large. At present, domestic popular styles are "small card", and the small card can also be replaced with "big card" (with a calorker). "Big Card" and "Small Card" apply to different types of GSM mobile phones, early models such as Motorola GC87C, 308C, etc., "big card", now the new model is basically used " Small card". The SIM card can be inserted into any mobile phone compliant with the GSM specification. 44, STK card
STK is an abbreviation of English Sim Tool Kit, referred to as "User Identification Application Development Tool", is the application menu developed in a large-capacity SIM card used in GSM mobile phones. STK can be understood as a group of developed value-added services, a small programming language that allows yourself to run your own application based on smart card-based user identity identification modules (SIM cards). STK technology is mainly used in mobile banking, stock trading, foreign exchange trading, financial secretary and other fields. Mobile new business "mobile banking", "stock query and transaction", etc. are using this technology. Like the original SIM card, STK card can be used on ordinary GSM mobile phones. Different, the STK card is a new generation of smart cards with high storage. (The normal SIM card is stored in 8k bytes, and the STK card capacity is 32K bytes, which will continue to be increased, which makes it possible to store large amounts of information.
45, mobile dream network card
The mobile dream network card is China Mobile's SMS-based value-added service, which is a multi-function SIM card combined with ICP application services in a normal STK function. This product transplays the ICP SMS Application Service to the STK card in the form of a menu, enhances the communication function of the phone, so that the mobile phone is more than just an isolated communication tool, but has become a comprehensive information terminal, so that users can be Easy mobile Internet business
46, GSM
GSM full-name globa1 system for Mobile Communications. Chinese is a "global mobile communication system",
Commonly known as "global pass".
GSM digital mobile communication system is designed by the standardization committee composed of major telecom operators and manufacturing manufacturers in Europe
Come, it is developed on the basis of a cellular system. Including GSM900MHz, GSM1800MHz and GSM1900MHz
Frequency segment. There are several important features of the GSM system: the anti-theft copy has good power, the network capacity is large, the number resources are rich, and the call is clear.
Clear, strong stability is not easy to interfere, the information is sensitive, the call is small, the phone power consumption bottom, etc.
47, GSM 1X
It is actually a "gateway" that can be integrated with China Unicom's GSM and CDMA. In this way, Unicom's GSM hand
Machine users change a dual-mode mobile phone, you can enjoy all data services on the CDMA online, such as downloading games, satellite positioning, and receiving
Email email, etc. This system can automatically identify and convert to appropriate when the user is using different mobile phone systems.
The network.
48, GPS
GPS is a referusion of GlobalPositioningsystem, namely the global satellite positioning system. GPS was originally applied to the army
The field of things. At present, GPS has been widely used in the transportation industry. It utilizes GPS positioning techniques to combine wireless communication technology (GSM or CDMA), Geographic Information Management System (GIS) and other high-tech, realize the monitoring of vehicles, the number of GSM networks
Channel, transfer the signal to the vehicle monitoring center, the monitoring center converts the location information through differential technology, then pass GIS
The location signal is displayed by the landmap language, and it will eventually achieve the positioning navigation of the vehicle, anti-theft and robbery, service through the service center.
Rescue, remote monitoring, trajectory and other functions.
49, PHS
PHS is the abbreviation of Personal Handyphone System, which is a digital mobile phone system in Japan.
Provide high-speed Internet access, high-definition, low-rate, and ultra-low electromagnetic wave, high-quality action call environments, most suitable for frequent
The city can provide the same functions as the GSM system. At present, most of the "small" in China uses this system.
50, WAP
WAP (Wireless Application Protocol) Wireless Application Protocol is an open standard protocol that uses it
You can transfer information on the network to your mobile phone or other wireless communication terminal. WAP is from Ericsson
(Ericsson), Nokia, Motorola (Motorola) and other communication business giants were established in 1997
It is made in the Line Application Protocol Forum (WAPFORUM) using a marker language that is similar to HTML WML
(WirelessMarkup Language) and access a general web page directly via WAP Gateway. With WAP, use
Households can use wireless communication terminals anytime, anywhere to obtain instant messaging terminals on the Internet, the information on the company's website, really
Wireless Internet access.
51, CDMA
CDMA is the English abbreviation of the code division multiple access, which is in digital technology
A new and mature wireless communication technology developed by branch-spreading communication technologies. It meets the market
High requirements for moving communication capacity and quality, with high spectral utilization, good voice quality, strong confidentiality, low drop rate, electromagnetic
Small radiation, large capacity, wide coverage, etc., can reduce investment and reduce operating costs. The principle of CDMA technology is base
The spread spectrum technology, which is about to be transmitted with a certain signal bandwidth information data, with a high speed greater than the signal bandwidth with a bandwidth.
The pseudo random code is modulated, and the bandwidth of the original data signal is expanded, and the carrier is modulated and sent. The receiving end is used
The same pseudo-random code, related to the received bandwidth signal, the wideband signal is changed to the narrowband signal of the original information data
That is, it is despread to implement information communication.
52, CDMA 1X
CDMA 1x refers to the first phase of the CDMA2000 (higher than IS-95, less than 2Mbps), and forward link data rate.
You can reach 144kbps, and the network part introduces packet exchange to support mobile IP services. Wireless connection in third generation mobile communication
In the International Proposal, the most widely been concerned is W-CDMA and CDMA2000. The CDMA2000 is the third of the United States proposed to ITU
The recommendations of the mobile communication aerial interface standard are the technical institutions for IS-95 standards to third generation evolution. CDMA 1X
The spread rate is SR1, that is, a single carrier-free direct series with a front-to-forward channel and a reverse channel.
Spread spectrum mode. Therefore, it can be easily compatible with IS-95 (A / B) to achieve smooth transition. Due to CDMA 1X
Reverse coherence demodulation, fast forward power control, send diversity, Turbo coding, etc., its capacity is greatly improved than IS-95. Under the same conditions, the capacity is approximately twice the capacity of the IS-95 system for ordinary voice services. CDMA 1X network
As a carrier platform as a voice service, it is also possible to use the wireless access Internet packet data bearer platform.
The household provides a traditional voice service, or the user provides the user's data service for the end-to-end packet transmission mode.
53, CDMA2000
This is a broadband CDMA technology developed by narrow-band CDMA (CDMAIS-95), and is pushed by the United States.
The evolutionary strategy from CDMA IS-95 (2G) -CDMA 2000 1X-CDMA 2000 3X (3G) is available. Among them, CDMA 2000
The main difference between 3X and CDMA 2000 1x is to apply multi-carrier technology, and increase bandwidth by using three carriers.
54, GPRS
GPRS is the English abbreviation, universal wireless grouping business, is based on the general Packet Radio Service.
The wireless packet switching technology of the GSM system provides end-to-end, wide-area wireless IP connections. Popular speaking, GPRS is a
High-speed data processing technology, the method is to transmit information to the user in the form of "packet". GPRS belongs to 2.5 generation movement
Communication technology is the mainstream technology of China Mobile GSM network toward 3G. Circuit exchange data relative to the original GSM dial mode
Transfer mode, GPRS is a packet switching technology, with "real-time online", "quantity billing", "quick login", "high
Advantages of Speed Transport "," Switching ".
55, 2.5g
At present, 2.5G mobile communication technology has been carried out from 2G to 3G, breakthrough 2G circuit.
Exchange technology has introduced packet switching techniques to packet switching techniques, resulting in a mass of data transmission rate.
Broken, is an excessive technology between 2G and 3G. Since 3G is a fairly vast project, it is much more
Miscellaneous, to be connected to 3G from the current 2G to 3G, therefore there is a 2.5G between 2g and 3G.
GPRS, HSCSD, WAP, EDGE, Bluetooth, EPOC and other technologies are 2.5g.
56,3g
3G is an abbreviation of English 3RD generation, refers to the third generation of mobile communication technology. Relative to the first generation of analog system
(1G) and the second generation of GSM, TDMA and other digital mobile phones (2G), the third generation of mobile phones generally refer to wireless communication and international mutual
A new generation of mobile communication systems combined with multimedia communication such as networked. It can handle multiple media such as images, music, video streams.
Body form, providing a variety of information services including web browsing, conference calls, e-commerce. In order to provide this service, no
The wire network must be able to support different data transfer speeds, that is, in the indoor, outdoor and driving environments.
Supports at least 2Mbps (megabytes / s), 384kbps (kilobytes / second), and 144kbps transmission speed. 2G now
The bandwidth provided by the network is 9.6kpbs. 2.5g increased to 56kpbs. 3G will have a wider bandwidth, which will reach
100-300kbps, not only transmit voice, but also transfer data, providing fast, convenient wireless applications, such as wireless
Access Internet
