1. IPTV service requirements
IPTV business puts forward the following requirements for the access network:
●High network bandwidth and user line available bandwidth;
●Support QoS, provide bandwidth guarantee and priority scheduling mechanism for video streams to ensure the distribution of video streams;
●The access network equipment needs to support multicast, fast processing of user multicast requests;
●Support multi-service, terminal access and management;
●User access authentication, user multicast authority management;
●High reliability and redundancy of the network.
2, Multi-edge mode supports IPTV business
The multi-edge mode suitable for multi-service development can better support the network requirements of IPTV services, as shown in Figure 1. In the multi-edge mode: high-speed Internet access services are accessed by an IP edge and controlled by BRAS; IPTV services point to the middleware platform through another IP edge; other services such as VoIP services point to the softswitch or related platforms through another IP edge; Broadcast replication and user control are completed in DSLAM; high-speed Internet access services adopt PPPoE certification, which fully protects current network investment; IPTV/NGN service network layer certification is completed through DHCP OpTIon 82. Multiple ATM PVCs or/and multiple Ethernet VLANs respectively carry different services, that is, services are differentiated and carried logically at the access layer. At present, European operators and some domestic operators are already deploying IPTV services on networks with this service mode. Multi-edge is a network architecture based on multi-service bearer, which can smoothly upgrade and bear various services to protect existing investments.
3. Service separation technology in access network
Under the multi-edge architecture, how to complete the separation of various user service data in the access network puts new requirements on the access equipment DSLAM. At present, there are two schemes of multi-PVC and single-PVC in the access equipment.
(1) Multi-PVC solution
Multi-PVC scheme is shown in Figure 2. In this solution, each port of the access device DSLAM should support multiple PVC modes. The untag data service flows sent by different user terminals are carried by different PVCs; PVC to VLAN mapping should be supported. The service flows of different PVCs are respectively mapped to different service VLANs, corresponding to S-VLAN1 and S- in Figure 2 VLAN2; In the VLAN Stacking application mode, S-VLAN is used to identify services, and C-VLAN is used to identify users. DSLAM completes the mapping from PVC to VLAN. The service flows of different VCs are mapped to different S-VLANs, corresponding to S-VLAN1 and S-VLAN2 in Figure 2; the service flows of different users use different C-VLAN identifiers, corresponding to C-VLAN1 and C-VLAN2 in the figure. And C-VLAN3.
(2) Single PVC plan
a single PVC scheme is shown in Figure 3. In this solution, the access equipment DSLAM should support each DSL port using a single PVC (or PVC-free packet interface) to carry different services; DSLAM maps PPPoE and IPoE packets to different services according to the Ethernet type of the packet VLAN, corresponding to S-VLAN1 and S-VLAN2 in Figure 3 (N:1 mapping, that is, the same service of different users is mapped to the same service VLAN). In addition to distinguishing service data on a single PVC based on the Ethernet type of the data packet, DSLAM equipment can also distinguish services based on VLAN Tag, but this places higher requirements on customer premises equipment (CPE).
In contrast, the multi-PVC scheme is more mature, and the current equipment support situation is better. Using different PVCs to carry different services has advantages in QoS assurance, service management, and service monitoring.
4. Multicast control technology
IP multicast technology effectively solves the problems of single-point sending and multi-point receiving, and multi-point sending and multi-point receiving. It realizes efficient point-to-multipoint data transmission in the IP network, which can effectively save network bandwidth and reduce network load. The basic IGMP Snooping/proxy function can solve the problem of the flooding of multicast packets. In the IPTV business environment, cross-VLAN multicast technology, enhanced multicast control technology, preview function, and call details can all be effectively Realize the management of user multicast services.
(1) Cross-VLAN multicast technology
The standard IGMP Snooping function only provides the multicast function in the same VLAN. At present, most operators use the port division 802.1q VLAN method to isolate and locate users. Therefore, when implementing multicast, users are usually in different VLANs. If the standard IGMP Snooping is still used at this time, it will cause a multicast stream to be established in each VLAN, and ultimately cannot achieve the effect of saving network bandwidth.
The use of cross-VLAN multicast technology can solve this problem well. For example, a certain multicast program source A is delivered from VLAN 100 on the network side to the DSLAM. For user 1 belonging to VLAN 1 and user 2 belonging to VLAN 2, when they order program A, the DSLAM will send the data of program A The flow is copied from VLAN100 to user 1 and user 2. For Program A, there has always been only one stream between the DSLAM and the upper-layer equipment, which achieves the purpose of saving bandwidth to the greatest extent. Therefore, the realization of cross-VLAN multicast in the access network is an indispensable function of the DSLAM or access node.
(2) Multicast access control
IGMP itself does not control whether a user can join a multicast group. Since the multicast data stream is replicated at the access node, the access node determines whether the user is allowed to obtain a certain multicast video stream. Control is particularly important for the security of video data, protecting the interests of operators, and preventing illegal users. At present, a personalized profile can be preset on the user port through the device management function, and access rights can be set for a specific one or a group of multicast programs, allowing or prohibiting users from joining, controlling multicast services, and preventing illegal users from occupying network resources . Through similar functions, it is also possible to perform more fine-grained control on the user's access to multicast programs on the access node, such as controllable preview, parental restrictions, etc., for specific users, restricting the number of programs and the number of programs they can watch, so as to be effective Protecting the resources of operators is conducive to the healthy development of IPTV services.
In terms of user legitimacy check, you can select and bind the combination of physical port, MAC address, IP address, VLAN, protocol type, and protocol port, and perform AnTI-spoofing anti-spoofing function on the access device to realize the internal network Security management to prevent IP address conflicts, etc.
In terms of preventing the proliferation of illegal multicast sources, the method of blocking uplink multicast data can be implemented at the access node to prevent illegal multicast video data from flowing into the network.
(3) User call detailed single function
User call detailed list is an indispensable function for IPTV service operation. DSLAM should be able to record in detail the user's on-demand behavior and related information, and synchronize with the data of the IPTV service platform. The user call detailed list provides strong data support for business billing, viewing statistics and user behavior analysis.
5. The performance and QoS technology of access network equipment
In order to meet the user's demand for video service picture quality and rapid information acquisition, it is usually necessary to access the network to achieve a bandwidth requirement of more than 2 Mbit/s per user port, non-blocking forwarding, and a millisecond-level quick response to user joining requests. Under the multi-service and multi-PVC scheme, at least there are more than 4 PVCs per port. The access layer can at least support simultaneous replication of multicast streams above 1 k. In terms of QoS service quality assurance, the access network equipment is required to have DiffSev capability, support the identification and mapping of 802.1p priority tags, support 4 priority queues per port, and data flow monitoring and shaping technology.
6. Concluding remarks
In summary, the access network is the first segment of the network that directly faces users. Due to the large number of users, complex access methods and high security requirements, when supporting IPTV services, in addition to the need for a significant increase in bandwidth In addition to meeting the needs of video services, support for multi-edge architecture, service separation technologies, multiple enhanced multicast control technologies, and QoS-related technologies will be the key to whether IPTV services can be better carried.
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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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Wechat: +8618078869184
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 :
First name/Given name: Yingfeng
Last name/Surname/ Family name: Zhang
Full name: Yingfeng Zhang
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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
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BANK CODE: 012
Account Name : FMUSER INTERNATIONAL GROUP LIMITED
Account NO. : 012-676-2-007855-0
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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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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.
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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
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