At present, broadcasting and television and telecommunications operators are upgrading and rebuilding networks. Broadcasting and television are vigorously promoting the construction of NGB networks, and telecommunications are greatly increasing the user's home bandwidth. Although the network foundations between the two are different, they are moving towards the future. The evolution of the network has also shown the same result.
The service development of telecom operators follows the evolution path of voice → voice + data → voice + data + video, and ultimately achieves service integration. IPTV is an important entry point for the realization of triple play, and IPTV and program broadcast control rights are its focus hot spot. The business development of the radio and television industry follows the evolution route of broadcast video → broadcast video + data → broadcast video + data + voice, and finally achieves business integration. The two-way transformation of digital TV is an important entry point for its three-network integration, while two-way transformation and security Regulation, broadband access and VoIP services are the key issues that need to be resolved.
Although the two have different technical means and approaches, they will eventually be able to provide triple-network integration services marked by three types of service bundling. Since IP technology uses a unified TCP / IP protocol, it has become a recognized telecommunications network, cable TV network and Internet. The three major networks can accept public communication protocols and information transmission platform protocols. Therefore, IP technology is the most solid technical foundation for the integration of the three networks.
In the process of achieving triple play, the home network will be the focus of competition between the two parties. Based on the "triple play" of the telecommunications network, the digital home network will continue to improve service quality and customer experience; based on the "triple play" of the Guangzhou Power Grid, The digital home network will have the competitive strength with the telecommunications network. To this end, telecommunications and radio and television operators also need to build efficient networks to enable families to enjoy a variety of applications and services based on "cloud computing."
In the process of business integration, the three-screen integration of TV screens, mobile phone screens and computer screens will become a trend, and the provision of content will become the core. The main characteristics of the three-screen integration are: a unified user interface, the same content, the same subscription can enjoy multi-screen TV services; remote control of home entertainment equipment (such as set-top boxes STB, etc.), to achieve remote setting reminders, set program recording Time, etc .; can maintain the consistency of the conversation, for example, after watching a TV series on the move, you can continue to watch when you return home; you can share network storage (such as a network video recorder).
Broadcasting and telecommunications networks have different evolution paths
The technical route for the implementation of the triple play of telecommunications follows the development process of broadband IP network construction → broadband speeding up → FTTH → NGN → triple play. Among them, the construction of broadband IPv6 network and FTTH access network is the focus of its work.
The technical route for the implementation of the triple play of radio and television follows the development process of digital transformation of cable TV → two-way digital TV → FTTH → NGB → triple play. Among them, the next generation of China's next-generation broadcast and television network (NGB) is the key to the implementation of the triple play of radio and television, and is to achieve the development goal of "triple play" at a higher technical level.
The characteristics of NGB mainly include four working modes: two-way interaction, multicast, push broadcast and broadcast, mixed transmission of analog and digital services, based on optimized IP packet bearer, and a wired and wireless mixed form of smart home network. The difference between the NGB network architecture and the telecommunications network at the transport layer and the core layer (high-speed transmission, switching, and routing). The main differences are in access layer, aggregation layer and management mode.
At the access and aggregation level, NGB adopts EPON and Cable Modem as the mainstream access technology, and also researches and develops CPON (China PON) technology and HiNOC (high-performance coaxial network) technology with independent intellectual property rights; telecommunications mainly Adopt EPON as the mainstream broadband access technology. Broadcast and television networks use access aggregation routers (ACRs) for end-to-end services, while telecommunication networks use BRAS / SR for end-to-end services.
In terms of network management and control, because the broadcast and television have control of the broadcast control rights of IPTV and programs, NGB emphasizes the end-to-end control of the entire process, while also monitoring the online and on-demand video information, including the tracking and traceability of the home Relatively speaking, telecommunications put more emphasis on end-to-end network management and business management.
In terms of network terminals, both broadcasting and telecommunications emphasize the construction of home networks. Radio and TV NGB emphasizes the support of the “smart home†NGB home network and requires integration with the Internet of Things. The home access method mainly considers the full use of the bandwidth resources of the coaxial cable. The NGB home information center must support the "push play" mode of radio and television characteristics. It needs to configure a large-capacity local video storage device. The NGB home terminal needs to support more Mode access mode, in the future to support 3D video.
FTTH is also the development direction of radio and television access network
The integration of the three networks will promote the rapid growth of customer demand and will bring more business. High-definition video and high-speed broadband services are eager for 100 Mbit / s of bandwidth. To achieve 100 Mbit / s per household requires FTTH technology, covering a range of up to 60 kilometers. Only FTTH can meet the long-term development requirements of "triple play". Therefore, the development of access networks for telecommunications and broadcasting is basically similar, and the goals are the same. Eventually, at the access level, the three networks are integrated based on FTTH. The development of the telecommunication access network follows the technical route of optical access copper retreat → broadband speeding → FTTH, and the development of the radio and television access network follows the two-way transformation → optical access copper retreat → FTTH technical route.
In the process of implementing the three-network integration of radio and television, the transformation of the access network can be divided into the following three steps: the network transformation method of the FTTB + EoC / FTTB + LAN overlay network; the use of optical path integration Network reforming method: adopting the optical path extension and FTTH perfect fusion network reforming method. The specific technical implementation solutions are mainly in the following ways: CMTS + ODN + Cable Modem solution, which can continue the evolution route of the HFC network; xPON (FTTH / FTTB) + ODN + EoC solution, which is active according to EoC , Passive can also be subdivided into MoCA, HomePNA, HomePlug, WiFi over Coax and HiNOC and other EoC technical solutions; xPON + ODN + LAN solution, the solution needs to lay another network cable to the home; CMTS + ODN + EoC + Hybrid solution of Cable Modem.
The difference between the radio and television and telecommunications access networks is mainly manifested in three aspects. (1) Business differences: The video services of telecommunications are mainly in the form of IPTV multicast and IPTV on-demand, and the video services of broadcasting are mainly in the form of digital TV broadcasting and VOD. (2) Technical differences: In terms of video transmission, telecommunications mainly use multicast technology, and broadcasting and television mainly use digital broadcasting technology; in terms of network coverage mode, telecommunications mainly use optical fiber, and broadcasting and television mainly use coaxial cables; in terms of IP degree , Telecom uses pure IP access technology, radio and television is part of the IP access technology. (3) Differences in management: There are differences between telecommunications and radio and television in terms of resource management systems, user provisioning, and failure repair systems.
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