DVB (Digital Video Broadcasting) is the abbreviation of digital video broadcasting, including satellite, cable (cable) TV, terrestrial digital TV, future high-definition TV, and other formats of digital TV broadcasting and transmission. As a set of technically complete, clear and easy-to-follow standards, DVB has been widely supported worldwide.
Both DVB source coding and system multiplexing follow the Mpeg2 standard. Channel coding can be divided into three categories: DVB-S, DVB-C, and DVB-T according to different propagation methods. The European Telecommunications Standards Organization ETSI established in 1994 and 1995 respectively. Three DVB standards suitable for DVB-S, DVB-C and DVB-T have been passed, and the features are as follows:
DVB-S: Satellite digital TV. The satellite system used in the 11/12GHz frequency band has low technical difficulty, the largest transmission traffic, wide coverage, and inflexible reception.
DVB-C: Digital cable television. Usually used for 8MHz cable channels, it can accommodate 38.5Mbit/s payload capacity, transmit 8-10 TV channels, there is no adjacent channel interference, the technical difficulty is medium, the transmission traffic is small, and it can have interactive functions.
DVB-T: Terrestrial digital broadcast television. The digital terrestrial TV system used in the terrestrial 7-8MHz frequency band has high technical difficulty, small transmission traffic and flexible reception.
Comparing the above three categories, satellites are the most direct way, the technical difficulty of realization is less, and the difficulty of ground transmission is the most difficult. Therefore, satellite broadcasting is the easiest to implement, and the amount of traffic that can be transmitted is almost unlimited. However, satellite reception must have a suitable antenna and receiver. It is extremely difficult to achieve flexible reception everywhere; on the contrary, the ground transmission situation is the opposite. The limited frequency spectrum can only provide a limited amount of business, but in the range of its coverage Inside, the reception is much more flexible. The situation of cable TV is somewhere in between. It has a higher business capacity, but it is limited by the range of cable laying.
The main part of the DVB standard
1. DVB source coding
DVB source coding adopts Mpeg2 standard.
2. DVB channel coding.
The purpose is to ensure correct reception. The channel coding under the three transmission conditions is basically similar, with two levels of outer code and inner code. The outer code uses RS (Reed-Solomon) code, and the inner code uses convolutional code. In order to avoid continuous bit errors caused by burst interference, the code stream interleaving technology is used for processing.
3. DVB signal modulation
The modulation method is different in different transmission situations. DVB-S satellite broadcasting system adopts four-phase phase shift keying (QPSK), QPSK modulation has strong anti-interference ability, and the receiver can reliably detect signals under very low signal-to-noise ratio, which is suitable for satellite channel requirements. In addition, QPSK modulation can transmit 2 bits of data in one cycle. Under the same bandwidth conditions, the code rate is doubled compared to BPSK.
DVB-C cable television system adopts quadrature amplitude modulation (QAM) modulation during transmission, because the main difficulty of the cable channel is the limited channel bandwidth, QAM modulation can maximize the channel utilization.
DVB-T terrestrial broadcasting system adopts Orthogonal Frequency Division Multiplexing (OFDM) modulation mode for transmission. Because of the poor channel environment in terrestrial broadcasting, the image will encounter many damages that are not found in satellite channels and cable channels. The OFDM modulation method uses multi-carrier instead of single-carrier, which is suitable for multipath, frequency selective fading, time selective fading, and The Doppler effect during terrestrial mobile broadcast reception has strong anti-interference ability.
4. Conditional access system
As DVB services tend to be pay-TV in the future, broadcasting operators are required to have the ability to control and manage network systems, and to authorize and send and receive signals according to user requirements. Therefore, DVB systems need to have a highly reliable conditional access system.
The task of the conditional access system is to ensure that broadcast services are only received by users authorized to receive it. Its main function is to continuously change the form of the signal by scrambling the broadcast and television signal, so that only the appropriate decoder and electronic key can be used. The correct signal is received. The electronic key is generally transmitted to the user through a smart card or other secure channel, and the signal is scrambled by encrypting the user's electronic key. On the other hand, the conditional access system must also ensure that authorized users can receive scrambled programs.
The conditional access system is composed of scrambler, descrambler, encryptor, control word generator, user authorization control system, user authorization management system and conditional access subsystem. The conditional access subsystem decodes the electronic key and recovers the information needed to control the descrambling sequence.
The control word (CW) is the key used in the decoder.
Authorization Control Message (ECM) is a special form of electronic key signal and channel addressing information. The sending end ECM is encrypted and transmitted with the signal, and the receiving end ECM is used to control the descrambler.
Entitlement management information (EMM) is a kind of information that authorizes users to descramble a certain service. The transmitting end EMM is encrypted and transmitted with the signal, and the receiving end EMM is used to turn on/off a single decoder or a group of descramblers.
The authorization management system issues instructions to the authorization control system based on the user's ordering and viewing of programs, and determines which users can be authorized to watch which programs and receive which services. At the same time, the authorization management system issues a bill to the user.
The authorization control system generates business keys according to the instructions of the user authorization management system, and determines which users watch which programs and enjoy which services.
The working principle of conditional access system:
At the signal sending end, the control word generator generates the control word CW first, and provides the CW to the scrambler and encryptor A. The typical word length of CW is 60bit, and it changes every 2 to 10 seconds. The scrambler performs a scrambling operation on the MPEG-2 data stream from the multiplexer according to the CW. The scrambler outputs the MPEG-2 data bit stream after being scrambled, and CW is the key used by the scrambler for scrambling. After receiving the CW, the encryptor A performs an encryption operation on the CW according to the service key (Sercice Key) provided by the user authorization control system, and the encryptor A outputs the encrypted control word, which is the ECM. The service key is also provided to the encryptor B. The difference between the encryptor B and the encryptor A is that the encryptor B can generate the key by itself, and can use this key to encrypt the service key sent by the authorization control system. Encryptor B outputs the encrypted service key, which is EMM. Then the ECM and EMM information are sent to the MPEG-2 multiplexer, and the image, sound and data signal bit streams sent to the same multiplexer are packaged into an MPEG-2 transport bit stream for output.
Note: ECM and EMM can both enter MPEG-2 data packets.
At the receiving end of the signal, the scrambled bit stream is obtained after demodulation. Since the CW is not recovered in the scrambled bit stream at the very beginning, the scrambled bit stream is sent to the de-complex without being descrambled by the descrambler. Use device. The ECM and EMM signals are placed in a fixed position in the header of the MPEG-2 data packet. Therefore, the demultiplexer can easily decode the ECM and EMM signals. The ECM and EMM signals from the demultiplexer are respectively sent to the decryptor A and the decryptor B in the smart card (Smart Card). Decryptor A and Decryptor B work together with the security processor in the smart card to recover the control word CW and send CW to the descrambler. The above process of obtaining CW is only performed at the instant of initialization. Once the CW is obtained correctly, the descrambler can resume normal operation, descramble the demodulated bit stream and restore it to a normal bit stream.
Three layers of protection for the security of DVB conditional access system:
The first layer of protection is to use the control word to scramble the image, sound and data signal bit stream output by the multiplexer. By disturbing the normal bit stream, the normal image cannot be obtained at the receiving end without specific descrambling. , Sound and data information.
The second layer of protection is to encrypt the control word CW with a service key, so that even if the CW is stolen during the transmission process, the illegal gainer of the CW cannot decrypt the encrypted CW.
The third layer of protection is the encryption of the service key, which makes the entire system more secure, so that unauthorized users cannot easily decrypt it even if the encrypted service key is obtained. Because if the encrypted service key cannot be decrypted, the correct CW cannot be obtained, and the normal signal bit stream cannot be decoded without the correct CW.
DVB conditional access system public adding and descrambling algorithm:
According to the different needs of broadcast and television operators, different conditional access systems can be supported in a network. But DVB only defines a public scrambling system, that is, different conditional access systems are required to use the same scrambling and descrambling algorithm specified by DVB, but each conditional access system's scrambling and descrambling key, CW and its generation are allowed The method is different. All conditional access systems conforming to the DVB standard have the same scrambling methods for image, sound and data signals, and the secret processing method of each key is set by the manufacturer.
Through the public scrambling system and MPEG-2 multiplexing transmission mechanism, DVB can transmit different programs and different services through different conditional access systems in the same transmission network. In this way, multiple conditional access programs can be received through one receiver.
Public interface:
The conditional access system is connected to the integrated receiving decoder through a public interface. Use the public interface to integrate the conditional access system on a module and install it into the slot of the DVB machine.
The physical format of the public interface adopts the PCMCIA standard of personal computers, which stipulates a 68-way connector.
DVB additional service information (SI)
SI information mainly provides setting information for receiving and decoding, such as the type of program, the time of the program, the source of the program, and so on. SI information has four basic tables: Network Information Table NIT, which gathers some programs together and provides parameters such as transponder, frequency, symbol rate, modulation mode and other necessary for tuning and receiving, for automatic tuning and reception of the receiving decoder; service description Table SDT, which gives the names and parameters of other programs related to each program or service in the transport stream; Program Information Table EIT, which gives the schedule and scheduled time of various programs; Time and date table TDT provides The specific start time and end time of the program. In addition, there are running status table RST, electronic program guide EPG and so on.
Main technical features of DVB
Overall characteristics:
The DVB system uses MPEG compressed audio, video and data formats as data sources.
The system adopts public MPEG-2 transport stream (TS) multiplexing mode;
The system uses common system service information (SI) used to describe broadcast programs;
The first-level channel coding of the system adopts R-S forward error correction coding protection;
Modulation and other auxiliary channel coding methods are determined by different transmission media;
Use common scrambling method and conditional access interface.
Audio features:
DVB audio coding adopts MPEG-2 second-layer audio coding MUSICAN. This scheme takes advantage of the masking effect of sound in the low-frequency part, and performs low-bit-rate coding on frequencies that are not very sensitive to the human ear, so as to achieve a larger compression rate. Reduce the audio encoding rate. MUSICAN supports the encoding of mono, stereo, surround sound and multi-channel multi-channel, with a sound quality close to that of a compact disc.
Video features:
DVB video coding adopts the MPEG-2 video coding standard, which defines 4 levels and 5 levels of coding. Each level and level can be combined arbitrarily to form a flexible and multi-purpose coding mechanism. The coding level is divided according to the definition of the image, which respectively represent from low-definition video tape to high-definition TV. The grades are divided according to the complexity of the algorithm, and each grade provides a set of compression tools and compression algorithms that constitute the encoding system.
Transmission multiplexer:
The transport multiplexer multiplexes 4-10 program streams (PES) fed into the multiplexer into MPEG-2 transport stream (TS). In the multiplexer, the amount of data is extremely large, and the code conversion from PES to TS works It is very heavy, and the key to the technology of the transmission multiplexer is how to bear the equalization and statistical multiplexing of the code stream, so as to maximize the channel utilization.
DVB channel encoder:
The TS stream is used as the input of the DVB channel encoder. In order to overcome the error generated during transmission or to correct the error effectively on the receiving side, the DVB channel encoder uses forward error correction coding and other means, and the encoding method uses RS code, The latest coding methods such as deep interleaving and trellis coding. Modulation methods are adjusted according to different channels. Satellite channels use QPSK, cable channels use 64QAM, and terrestrial channels use OFDM.
User-side set-top box:
The set-top box is a device used by the user to restore the signal. The signal processing process includes: receiving the signal from the cable or satellite, demodulating, channel decoding, and recovering the MPEG-2 transport stream, and then demultiplexing and selecting The required program stream, and the necessary decryption processing of the program stream, sends the MPEG-2 video and audio decoder for source decoding, and the recovered video and audio signals are sent to the user's TV receiver and audio playback equipment. In addition, the set-top box can also cover up when there is an error in the code stream, and realize the management of the IC charge card.
DVB-C standard
DVB-C has made explanations on data transmission, digital TV transmission, encryption, electronic navigation and backhaul, covering almost all aspects of the realization of a broadband integrated information service system.
DVB-C system composition
The DVB-C system is composed of functional modules, which can adapt the TV baseband signal to the channel characteristics of the cable TV system. Consider the following baseband TV signal streams at the front end: satellite signals, signals from the feeder link, and local program sources.
The functions of each part in Figure 1 are:
(1) Baseband physical interface
The data structure is adapted to the format of the signal source, and the frame structure is the same as the MPEG-2 transport format including the sync byte.
(2) Synchronous polarity reversal and randomization
The unit will flip the sync byte polarity and randomize the data stream for spectral line shaping. The data at the output of the MPEG-2 transport multiplex should be randomized as shown in the following figure. The generator polynomial of the pseudo-random binary sequence is g(x)=x15+x14+1. Every 8 transport packets are a group, and the MPEG-2 sync byte of the first packet in each group should be inverted bit by bit to provide a start signal for the decoder. And at the beginning of each group, the descrambler is reset once, and the reset initialization sequence is: 100101010000000.
(3)RS coding
For each randomized transmission packet, the unit uses truncated RS code to generate a data packet with error-proof function. The sync byte itself also participatesRS code.
(4) Convolutional interleaving process
The unit should complete a convolutional interleaving transformation with a depth of I=12. The sync byte period will remain unchanged.
(5) Convert bytes to m-bit symbols
This unit transforms the bytes generated after interleaving into QAM symbols.
(6) Differential coding
In order to obtain a rotation-invariant constellation diagram, the unit will differentially encode the two most significant bits (MSB) of each symbol.
(7) Baseband forming
This unit completes the mapping of differentially encoded m-bit symbols to I and Q signals. Before QAM modulation, the I and Q signals are subjected to cosine roll-off square root filtering.
(8) QAM modulation and physical interface
This unit completes QAM modulation. Then connect the QAM modulated signal to the cable RF channel.
Digital set-top box system based on DVB-C standard
The digital set-top box is the best solution for the transition from analog TV to digital TV, and is a transition product of digital TV. Through the digital set-top box, analog TV can be used to watch digital programs.
This kind of set-top box can realize the reception of digital TV broadcast based on DVB-C and provide electronic program guide (EPG). The signal from the Cable is tuned and demodulated by QAM to form an MPEG-2 TS composite stream and sent to the demultiplexer, and the demultiplexing module extracts specific streams (video, audio and data) from it for decoding. The user controls the set-top box through remote control, mouse or keyboard, and the set-top box can also interact through the return channel.
DVB-C integrated service set-top box hardware system:
In order to realize various functions of DVB-C integrated service set-top box, the hardware must include the following parts: DVB module, data processing module and presentation module.
(1) DVB module: First, this module realizes QAM demodulation and channel decoding of the cable analog signal, then decrypts, demultiplexes and filters, and then sends it to the data processing module for processing. Secondly, this module realizes the coding and QPSK transmission of the return channel at the same time.
(2) Data processing module: This module is the brain of the set-top box. It usually consists of high-performance CPU, ASIC and some peripheral devices (such as high-speed data bus, computer interface, Smart Card reader, etc.). Complete functions such as separation of data and video, DVB/DAVIC protocol interpretation, MAC control of network access, encryption and decryption, user input control, and high-speed data exchange with computers.
(3) Presentation module: This module implements the display function of the set-top box. Generally composed of MPEG2 decoder, data browser, display data buffer, video encoding, audio encoding, etc., it mainly completes the decoding and display of MPEG2 digital TV programs, the interpretation and display of various data services, the menu display and graphics of electronic program navigation User interface (GUI) and other functions.
At present, the two major terrestrial digital television systems, DVB-T in Europe and ATSC in the United States, use MPEG-2 coding standards for their video coding standards. The difference is that ATSC uses "square pixels" and AC-3 audio compression algorithms. It is also slightly different from modulation technology.
DVB-T data packet format
1. Based on TS packets with a fixed length of 188 bytes, it is a very basic data broadcast.
2. Based on the PES packet, the PES packet provides a variable-length packaging method with a maximum packet length of 64k bytes. According to different clocks, it can be divided into three formats: asynchronous data stream, synchronous data stream, and synchronized data stream. The asynchronous data stream is used to transmit asynchronous data; the synchronous data stream supports synchronous data, and the display clock tag PTS is used to provide accurate synchronization of the data stream, and the clock information is accurately restored at the receiving end; the synchronized data stream is not only synchronous, but also Synchronization must also be maintained between each data stream.
3. Based on data slices, MPEG-2 data slices Section also provides a variable-length packing method, but the maximum packet length is 4k bytes, and it is asynchronous transmission. This format can transmit data packets of other communication protocols through the MPEG-2 code stream, and can complete demultiplexing and filtering through the hardware of the decoding chip, and the efficiency is very high.
4. Based on DSMCC (Digital Storage Media Control Command), this format can periodically transmit relatively stable data with little change, ensuring that users receive data as much as possible.
5. Based on the object, this format supports user-to-user data transmission.
What is digital TV?
The meaning of digital television (or DTV) does not refer to the televisions in our ordinary homes, but a new television system that uses digital signals to broadcast images and sounds. It includes the entire process of program compilation, compression, transmission, and reception of television programs. Both adopt digital signal processing. The specific transmission process is: the image and sound signals sent by the TV station are digitally compressed and digitally modulated to form a digital TV signal, which is transmitted through satellite, terrestrial wireless broadcasting or wired cable, etc., and received by the digital TV through digital decoding. Reconcile digital video and audio decoding processing to restore the original image and accompanying sound. Because the whole process is processed by digital technology, the signal loss is small and the reception effect is good.
The relationship between digital TV and digital TV
To be precise, digital television refers to a system that uses digital technology to process, transmit, store, record, receive, and control television signals. The digital TV refers to a TV receiver that digitally processes video signals and audio signals without changing the current transmission system. The former refers to a whole set of systems, while the latter is only a kind of equipment and a branch of the former.
Classification of digital TV
1. Classified by signal transmission method: it can be divided into three types: terrestrial wireless transmission (terrestrial digital television), satellite transmission (satellite digital television), and cable transmission (cable digital television). 2. Classified by product type: It can be divided into digital TV monitors, digital TV set-top boxes, and integrated digital TV receivers. 3. Classified by definition: it can be divided into low-definition digital TV (image horizontal definition greater than 250 lines), standard-definition digital TV (image horizontal definition greater than 500 lines), high-definition digital TV (image horizontal definition More than 800 lines, namely HDTV). 4. Classified according to the display screen format: it can be divided into two types: 4:3 frame ratio and 16:9 frame ratio. 5. According to the number of scanning lines (display format): it can be divided into the number of HDTV scanning lines (more than 1000 lines) and the number of SDTV scanning lines (600-800 lines), etc.
Compared with traditional analog TV, what are the advantages of digital TV?
1. High-definition TV screen: The definition is comparable to DVD. 2. High-quality sound effects: Digital technology is adopted to make the sound of digital TV more realistic. 3. Rich in content: the number of programs has increased. 4. Convenient program guide: The electronic program guide is convenient to quickly find your favorite channel. 5. Strong anti-interference ability: The digital TV is less interfered by other electrical appliances, so the picture is stable. 6. Multiple extended functions: In addition to some basic functions, the set-top box also has functions such as Internet access and on-demand.
What is a set-top box?
Set-top box, also known as set-top box, the English name is STB (Set-top Box). It is a small box placed on top of the TV, and it is named after it. A digital TV set-top box is a conversion device that can convert digital TV signals into analog signals. It decodes and restores the digitally compressed image and sound signals, generates analog video and sound signals, and provides high quality to viewers through TV monitors and audio equipment. TV show.
Classification of set-top boxes
The first type is called the basic set-top box, which can meet the basic functions of free digital TV services and pay TV services. It has the reception of authorized digital TV services, Chinese display, basic electronic program guide EPG (program preview), software upgrades, and encrypted information Tips, fault tips and other functions. The second category is called enhanced set-top boxes, which can meet the needs of pay-per-view services, data broadcasting, broadcast video-on-demand and local interactive services on a basic basis. The third category is called advanced set-top boxes. On an enhanced basis, it can meet the functions of video-on-demand, Internet browsing services, email receiving and sending, interactive games and IP phone services.
Digital TV Standard
The digital TV standard is a huge standard system involving five main technical links and ten technical standards, including production, transmission, and reception, but the most core is the transmission standard, which mainly includes satellite, cable, and terrestrial. Among the three transmission standards, my country’s satellite standard has been determined to be DVB-S, and the cable television standard adopts the European standard DVB-C. Now only the terrestrial digital standard has not yet been determined. In addition, my country’s self-developed AVS standard has been successful and will Gradually promote the use.
The technology currently used by TV stations:
What the TV station receives is a digitally modulated satellite signal, which is demodulated in the computer room and modulated into an analog signal, which is transmitted to the cable TV backbone network through optical fiber, and the signal is transmitted to the branch box and converted into an analog signal for distribution to users.
The technology to be adopted by the TV station
TV stations accept digitally modulated or analog satellite signals with high signal-to-noise ratio, as well as optical fiber signals and self-made program analog or digital signals from the provincial center. Why do you say so many? Now the transmitted signal sources include digital and analog signals. The signal or analog to digital signal is modulated into a digital signal by the computer room, and then transmitted into the cable TV backbone network by the optical fiber. The signal is transmitted to the digital signal branch box of the community and distributed to each user. The user can also transmit the remote control signal through the branch box In the computer room, the branch box is equivalent to the switch of an ordinary computer network, and the set-top box is equivalent to a foolish little computer. We use the second type of enhanced set-top box in the set-top box. The set-top box converts the digital signal into an analog signal to the TV, so our TV receives the enhanced analog signal.
Note 1: Generally, TV programs produced by TV stations are converted from analog signals into digital signals. If it is purely digital production, the most likely digital cameras of TV stations are news cameras fixed in the studio. Portable digital cameras are probably not equipped yet.
|
|
|
|
How far(long) the transmitter cover?
The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far.
EXAMPLE 5W FM Transmitter use in the city and hometown:
I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile).
I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile).
I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft).
Below are the approximate range of different power FM Transmitters. ( The range is diameter )
0.1W ~ 5W FM Transmitter ：100M ~1KM
5W ~15W FM Ttransmitter : 1KM ~ 3KM
15W ~ 80W FM Transmitter : 3KM ~10KM
80W ~500W FM Transmitter : 10KM ~30KM
500W ~1000W FM Transmitter : 30KM ~ 50KM
1KW ~ 2KW FM Transmitter : 50KM ~100KM
2KW ~5KW FM Transmitter : 100KM ~150KM
5KW ~10KW FM Transmitter : 150KM ~200KM
How to contact us for the transmitter?
Call me +8618078869184 OR
Email me [email protected]
1.How far you want to cover in diameter ?
2.How tall of you tower ?
3.Where are you from ?
And we will give you more professional advice.
About Us
FMUSER.ORG is a system integration company focusing on RF wireless transmission / studio video audio equipment / streaming and data processing .We are providing everything from advice and consultancy through rack integration to installation, commissioning and training.
We offer FM Transmitter, Analog TV Transmitter, Digital TV transmitter, VHF UHF Transmitter, Antennas, Coaxial Cable Connectors, STL, On Air Processing, Broadcast Products for the Studio, RF Signal Monitoring, RDS Encoders, Audio Processors and Remote Site Control Units, IPTV Products, Video / Audio Encoder / Decoder, designed to meet the needs of both large international broadcast networks and small private stations alike.
Our solution has FM Radio Station / Analog TV Station / Digital TV Station / Audio Video Studio Equipment / Studio Transmitter Link / Transmitter Telemetry System / Hotel TV System / IPTV Live Broadcasting / Streaming Live Broadcast / Video Conference / CATV Broadcasting system.
We are using advanced technology products for all the systems, because we know the high reliability and high performance are so important for the system and solution . At the same time we also have to make sure our products system with a very reasonable price.
We have customers of public and commercial broadcasters, telecom operators and regulation authorities , and we also offer solution and products to many hundreds of smaller, local and community broadcasters .
FMUSER.ORG has been exporting more than 15 years and have clients all over the world. With 13 years experience in this field ,we have a professional team to solve customer's all kinds of problems. We dedicated in supplying the extremely reasonable pricing of professional products & services. Contact email : [email protected]
Our Factory
We have modernization of the factory . You are welcome to visit our factory when you come to China.
At present , there are already 1095 customers around the world visited our Guangzhou Tianhe office . If you come to China , you are welcome to visit us .
At Fair
This is our participation in 2012 Global Sources Hong Kong Electronics Fair . Customers from all over the world finally have a chance to get together.
Where is Fmuser ?
You can search this numbers " 23.127460034623816,113.33224654197693 " in google map , then you can find our fmuser office .
FMUSER Guangzhou office is in Tianhe District which is the center of the Canton . Very near to the Canton Fair , guangzhou railway station, xiaobei road and dashatou , only need 10 minutes if take TAXI . Welcome friends around the world to visit and negotiate .
Contact: Sky Blue
Cellphone: +8618078869184
WhatsApp: +8618078869184
Wechat: +8618078869184
E-mail: [email protected]
QQ: 727926717
Skype: sky198710021
Address: No.305 Room HuiLan Building No.273 Huanpu Road Guangzhou China Zip:510620
|
|
|
|
English: We accept all payments , such as PayPal, Credit Card, Western Union, Alipay, Money Bookers, T/T, LC, DP, DA, OA, Payoneer, If you have any question , please contact me [email protected] or WhatsApp +8618078869184
-
PayPal.  www.paypal.com
We recommend you use Paypal to buy our items ,The Paypal is a secure way to buy on internet .
Every of our item list page bottom on top have a paypal logo to pay.
Credit Card.If you do not have paypal,but you have credit card,you also can click the Yellow PayPal button to pay with your credit card.
---------------------------------------------------------------------
But if you have not a credit card and not have a paypal account or difficult to got a paypal accout ,You can use the following:
Western Union.  www.westernunion.com
Pay by Western Union to me :
First name/Given name: Yingfeng
Last name/Surname/ Family name: Zhang
Full name: Yingfeng Zhang
Country: China
City: Guangzhou
|
---------------------------------------------------------------------
T/T . Pay by T/T (wire transfer/ Telegraphic Transfer/ Bank Transfer)
First BANK INFORMATION (COMPANY ACCOUNT):
SWIFT BIC: BKCHHKHHXXX
Bank name: BANK OF CHINA (HONG KONG) LIMITED, HONG KONG
Bank Address: BANK OF CHINA TOWER, 1 GARDEN ROAD, CENTRAL, HONG KONG
BANK CODE: 012
Account Name : FMUSER INTERNATIONAL GROUP LIMITED
Account NO. : 012-676-2-007855-0
---------------------------------------------------------------------
Second BANK INFORMATION (COMPANY ACCOUNT):
Beneficiary: Fmuser International Group Inc
Account Number: 44050158090900000337
Beneficiary's Bank: China Construction Bank Guangdong Branch
SWIFT Code: PCBCCNBJGDX
Address: NO.553 Tianhe Road, Guangzhou, Guangdong,Tianhe District, China
**Note: When you transfer money to our bank account, please DO NOT write anything in the remark area, otherwise we won't be able to receive the payment due to government policy on international trade business.
|
|
|
|
* It will be sent in 1-2 working days when payment clear.
* We will send it to your paypal address. If you want to change address, please send your correct address and phone number to my email [email protected]
* If the packages is below 2kg,we will be shipped via post airmail, it will take about 15-25days to your hand.
If the package is more than 2kg,we will ship via EMS , DHL , UPS, Fedex fast express delivery,it will take about 7~15days to your hand.
If the package more than 100kg , we will send via DHL or air freight. It will take about 3~7days to your hand.
All the packages are form China guangzhou.
* Package will be sent as a "gift" and declear as less as possible,buyer don't need to pay for "TAX".
* After ship, we will send you an E-mail and give you the tracking number.
|
|
|
For Warranty .
Contact US--->>Return the item to us--->>Receive and send another replace .
Name: Liu xiaoxia
Address: 305Fang HuiLanGe HuangPuDaDaoXi 273Hao TianHeQu Guangzhou China.
ZIP:510620
Phone: +8618078869184
Please return to this address and write your paypal address,name,problem on note: |
|
