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"Triple play" unstoppable and excellent two-way network reform program is of utmost importance

2016-02-17 10:02:55 Author: Fujian Provincial Communications Administration Wen Hongming Source:Communications World NetworkComment:0  Click:


"Triple play" is an irresistible trend in the future. Currently, the convergence and penetration of services in the field of broadcasting and telecom are gradually accelerating. The start of a two-way network construction is an inevitable requirement for Radio and TV Networks to break the two-way network's insufficient development, and it is also to promote the realization of "broadband China." The key measures of the "Triple Play" strategy.
Traditional cable television networks are difficult to adapt to future development needs
The traditional cable television network has many constraints and it is difficult to adapt to the needs of network development. From the perspective of existing networks, one is that the stability of the cable parameters is poor, the signal attenuation characteristics of the coaxial cable are easily affected by temperature and humidity, and the deterioration degree of each parameter increases with the increase of the service life; second, the line cascade distortion Strong, more cascaded line amplifiers will produce an additive effect of noise and distortion, degrading system specifications. Third, network expansion is constrained. As the number of transmission programs increases, the system's composite third-order distortion (CTB) increases, which severely restricts the transmission network. Extensions.
From the development status quo: First of all, the continuous emergence of new cable TV services, such as: Internet high-speed access, video on demand, etc., put forward the requirements for upgrading the existing transmission network; Second, the video transmission industry is still a high degree of monopoly, repeated construction, and vicious Competition; Thirdly, fiber optic links and resources do not really realize the optimal combination of network resources; finally, the transformation of two-way networks is not thorough enough, and some of the networks that have been reconstructed have different network conditions because of different standards and purposes for transformation. These factors have constrained the rapid development of radio and television services in the future.
Two-way network reconstruction work is not complete
In recent years, although the two-way network transformation of cable television has achieved certain achievements with the development of CM (Cable Modem), EPON and other technologies, the transformation work has not been thorough. The main reasons are as follows: First, China's Internet TV broadcasts have a high cost of transformation and a large investment in the transformation; Second, the value-added services of broadcasting and television have not fully matured; Third, the operation and management of multi-services is not enough, operation costs are high, and service quality is high. Insufficient; Fourth, the lack of cross-border integration of the industry, the industry conflict of interests is greater; Fifth, the impact of policy constraints is greater, only the basic telecommunications companies and some broadband access companies have broadband operating qualifications.
In order to accelerate the comprehensive advancement of “triple play” across the country, effectively improve the operational efficiency and service level of the industry, promote the formation of a unified national information and communication network platform and create new services and operating mechanisms, and then promote the transformation of the information industry and the entire population. The upgrading of consumption and the improvement of the people’s livelihood, the search for suitable network forms, and the selection of appropriate two-way technologies to achieve two-way network reform are of utmost importance, and the smooth development of “triple play” content industry and service industries, as well as better response to the future Development and challenges are of great significance.
Need to choose the right two-way network reform program
At present, the work of two-way network reform mainly focuses on the transformation of rural and urban networks. The transformation of rural power grids has scattered users in rural areas and requires long-distance transmission. There are fewer broadband access users in the initial stages of the service. If the traditional HFC method (CMTS) is used for two-way transformation, there are features such as high cost, large noise, and poor economic efficiency; The network has a relatively concentrated user, and the bidirectional access rate is relatively high. The demand for broadband Internet access, on-demand services, and IP fixed-line services is diversified, and a series of more stringent network management configurations such as IP, VLAN configuration, and speed limit are required. Requirements and other characteristics.
In view of the above characteristics, the author believes that in the agricultural network two-way network reform, EPON + low-frequency EOC technology should be adopted to solve rural network transmission distance, complex network lines, fewer operators and other issues, to effectively achieve rural radio and television broadband coverage at a lower cost And opening. The two-way network change in urban networks should use EPON+ active EOC technology to achieve two-way network coverage on existing radio and television networks without renovating existing networks. This effectively saves line construction costs and solves urban residential buildings. The problem of construction difficulties in the re-laying of five types of lines has been implemented so as to realize the development of multiple services.
EPON+ Low Frequency EOC Technology Realizes Two-way Network Reform of Rural Network
In the two-way network reform of agricultural networks, EOC headends, terminals, and auxiliary equipment are used. In the solution, network signals are transmitted from the IP center room through optical fiber lines to the ONUs at the optical nodes, and the optical signals are converted into suitable Ethernets by the optical converters. The signal transmitted on the network cable is sent to the EOC head end for signal modulation, and then modulated to a signal mixer for mixing with the TV signal. The mixed signal is transmitted through the original CATV coaxial cable. If there is an amplifier in the coaxial line, jumpers are added to bridge them, and then the existing branch device distributors are used in the home users. In home users, TV signals can be used directly, and network signals are demodulated by EOC terminals to achieve broadband Internet access.
The advantages of this solution are mainly reflected in the following aspects: First, the construction cost is low. The signal from the IP center room is transmitted through the Ethernet line and is directly modulated into a signal that can be transmitted in the coaxial cable, so that the existing network can be fully utilized. Axial cables and branch distributors can effectively save network construction costs. The second is the long transmission distance, which effectively solves the problems of scattered and long-distance transmission attenuation in rural network users. Third, the difficulty of construction is small, the scheme does not need to be reconstructed in two directions, and the workload is small. The construction difficulty is greatly reduced, and it is particularly suitable for star-shaped and tree-type cable distribution networks, and it is simple and convenient to use a low-frequency jumper to bridge the amplifier. The fourth is that the network speed is fast, and the EOC headend and the terminal are Can achieve the physical layer of nearly 100M of shared bandwidth, fully meet the requirements of the user; Fifth, the terminal impact is small, the physical layer between the terminal is used to isolate each other, do not interfere with each other, not only to ensure the terminal security, but also reduces the maintenance workload Sixth, a wide range of signals, signal attenuation up to 75dB, and the use of low-frequency modulation technology, can cover about 1000M The scope not only satisfies the decentralization of rural users, but also meets the rapidity of business requirements. Seventh, it is complete with supporting equipment, complete with supporting equipment, and the types of auxiliary equipment are diversified to adapt to the development of the network. Eighthly, the equipment is stable and high, and the operation is stable and reliable. Dimensional workload.
EPON+ Active EOC Technology Realizes Two-way Network Change in City Network
In the bidirectional network change of city network, the network signal is transmitted from the IP center engine room to the ONU of the cell optical node, transmitted to the EOC head end via the Ethernet cable, transmitted to the mixer and the TV signal via the head end modulation, and then passed through the CATV coax. Cable output, mixed signal sent to the corridor. If there is an amplifier on the corridor, jumpers are added at the amplifier to bridge. The amplifier outputs to different corridors and then branches to all home users. In home users, the TV signal can be used directly, and the network signal is demodulated through the EOC terminal to achieve broadband Internet access, video on demand, fixed voice and other services.
In addition, the solution uses VLAN/QoS technology to perform fine management of the user's data, voice, and video services. Bandwidth allocation and management configurations are performed according to the user's different service requirements. The EOC head-end network management supports IP settings, VLAN division, and QOS settings. And other aspects of network management.
The advantages of this solution are mainly reflected in the following: First, the construction cost is low. Compared to the traditional LAN construction and access process, the vertical and horizontal five-category cables that need to be amplified are fully utilized. This solution makes full use of the coaxial cable of the existing network. The effective bearer of data and cable TV services greatly reduces the cost of line construction. Second, the difficulty of construction is small. This solution eliminates the need to place new cables in users' homes, effectively avoids the need to re-lay five types of line problems, and has the effect on users' families. The impact of the renovation is small and widely welcomed by the property and users. Third, the network is well developed. The EOC system is used to build a tree network structure. With the development and needs of the business, the network can be effectively implemented through simple cascade connection. Expanded and flexible networking; Fourth, the network management is perfect, because EOC head-end adopts VLAN to realize the division of multi-services, supports HTTPS, SNMP network management interface, provides functions such as user's bandwidth, information, IP address management and traffic monitoring, etc. Management is simple and convenient.
Summary
Whether it is the reconstruction of rural networks or the reconstruction of urban networks, it has obvious advantages to adopt EoC technology to complete broadband access to radio and television. EOC transmits broadband data through coaxial cables and mixes broadband signals with television signals on CATV coaxial cables. Transmission and then demodulation and separation of data signals at the user's terminal, which has the advantages of rapid and flexible deployment, rapid acquisition of the market, low cost, fast recovery, etc., can make full use of the existing radio and television line resources and save a large number of two-way network reconstruction investment. Increase the revenue of radio and television operators. If these two options can be adopted, they will also save costs for broadcasters and bring huge profits.
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