Let's take a look at the IPTV related situation first:
1. Current TPTV market situation
a) As of February this year, the total number of IPTV users nationwide has reached 36.302 million, and the number of mobile Internet users in my country is close to 900 million. The monthly access per capita is nearly 300M, 8M broadband is half, and fiber optics is nearly 40%.
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Figure 1 The overall digital TV transition in my country
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Figure 2 The scale of digital TV users and the degree of cable digitization in each province
b) The economic performance of the communications industry in March this year showed that the total telecommunications business of the three basic telecommunications companies completed 18.01 billion yuan, a year-on-year increase of 22.7%, which is 7.7 percentage points higher than the same period;
l The main telecom IPTV set-top boxes currently on the market in China include: [SD]: Huawei, ZTE, Changhong, UT, MOTO, Fiberhome, Da Ya, Tongzhou, Jiulian, Bell, Skyworth, Chaoge, Dahua, and Shuyuan. [HD]: Huawei, ZTE, MOTO, Daya, Chaoge, Fiberhome, Cozhou, Hisense, Skyworth, Kaitian, UT, Changhong, Bell, Feiyue, Jiulian, Shuyuan.
It can be seen from the above that the requirements for IPTV will become higher and higher in the future. When optimizing the EPG front-end, one must consider the carrying capacity of the server, and second, the performance and compatibility of the set-top box must be considered.
[Preparation]: Considering the particularity of the environment, you need to make the following preparations: Hardware: PC, set-top box, network hub (that is, HUB, you can also use the switch with mirroring function). Software: Chrome, Wireshark. If there is no remote environment, all of these need to be used. If there is a remote debugging environment, HUB and Wireshark are not needed.
Reduce the number of requests: Generally, it is best to request less than 5 requests for a page. When the number of requests reaches more than 10, the speed is obviously much slower. How to reduce the number of requests?
1. Reduce the number of pictures and integrate multiple pictures together, each picture is a request.
2. There must be no resources that cannot be requested, that is, there must be no HTTP 404 resources.
3. Reduce the number of iframe requests.
4. Reduce AJAX requests.
5. Lazy loading of resources asynchronously through AJAX.
6. Combine javascript and CSS.
JS code
1. Try not to use JQuery, most set-top boxes do not support it.
2. Combine and minimize JAVASCRIPT.
3. Embed small js into the page.
4. Pay attention to the compatibility of the set-top box to the buttons. Generally, standard definition only supports onkeypress, and most do not support onkeydown. If you try to use it, the set-top box will freeze. If both types of keys are supported, JS can judge the key to execute the key only once.
5. Try to use AJAX's GET asynchronous request and use less POST request.
6. Try to use for instead of each.
7. Use eval as little as possible.
8. Try to use getElementById to access, do not use getElementsByName, getElementsByClassName, getElementsByTagName, most set-top boxes are not compatible with these methods.
9. Try to use the join method to concatenate characters, and less use the concat function, or operators like +=.
10. When rewriting system events, try to return false or 0, or null as much as possible, such as system keystrokes and playback events.
11. Extract the shared js and place it outside for other pages to call.
Picture:
1. Use png for transparent images as much as possible and use gif less.
2. Compress jpg and delete unnecessary information in jpg.
3. The src of img cannot be left blank, because some set-top boxes will make additional requests, let alone set a non-existent value.
4. Don't zoom the picture size on the front end of the EPG, the picture can be designed according to the actual size, that is, try not to have the width and height attributes in the img tag.
5. Lazy loading of pictures, not all pictures are presented immediately, pictures can be displayed on demand.
CSS
1. Avoid CSS @import. Most set-top boxes do not support @import, and link should be used.
2. Embed small CSS into the page.
3. Incorporate and minimize CSS.
4. Compress the CSS.
5. Get rid of unnecessary CSS.
Javascript
1. Use document.write as little as possible.
2. Delay loading of javascript.
3. Adjust the JS order and put the ones used in onload behind the html file as much as possible.
4. Compress JS.
5. Event cannot be used as a function name.
Java
1. Disable session, when session is not needed <%@ page session="false"%>.
2. Try to use <%@ include file=”xxx.jsp” %> and less use <jsp:include page="xxx.jsp"/>.
3. Try to use java to get URL parameters, JS getting is relatively troublesome and slow.
Seven, can not be optimized through the front end:
1. When making an asynchronous request, when the server's response header is 204, neither iframe nor ajax may solve the problem, and there may be repeated requests, but ajax can perform better.
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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
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E-mail: [email protected]
QQ: 727926717
Skype: sky198710021
Address: No.305 Room HuiLan Building No.273 Huanpu Road Guangzhou China Zip:510620
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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
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Pay by Western Union to me :
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Full name: Yingfeng Zhang
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City: Guangzhou
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First BANK INFORMATION (COMPANY ACCOUNT):
SWIFT BIC: BKCHHKHHXXX
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Account Name : FMUSER INTERNATIONAL GROUP LIMITED
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Second BANK INFORMATION (COMPANY ACCOUNT):
Beneficiary: Fmuser International Group Inc
Account Number: 44050158090900000337
Beneficiary's Bank: China Construction Bank Guangdong Branch
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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.
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* 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.
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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: |
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