subject: Broadcasting Planning And Construction Of The Data Network (on) - Radio And Tv, Network Planning, [print this page] Author: China Cable television Network Company Peng Jin
[Abstract] protocol-based IP network will be able to provide amphibious operations (Triple-Play) as the representative of integrated services, represent the future direction of network convergence technology, has huge development potential and market prospects. This combination of state Broadcasting TV Cable Backbone network integrated service delivery platform a project Planning Construction experience to explore the course of data network planning and construction of radio and television, should focus on a number of issues to consider.
[Key words] data network, IP 20 since the 90's, TCP / IP protocol has become the leading selection of data networks, IP-based network protocol will be able to provide amphibious operations (Triple-Play), represented by the integrated services, represent the future of network convergence technologies direction, with great development potential and market prospects. Accordingly, the original Film and Television Bureau in "during the" formulation of a national cable television transmission network planning, the country's cable television network operations in accordance with the different hosts, into the broadcast TV service transport platform (hereinafter referred to as A platform ) and integrated service delivery platform (hereinafter referred to as B platform), where A platform to undertake the transmission of radio and television programming task, B platform will have radio and television transmission characteristics of multi-functional operations and data and voice services.
After 8 years of effort, the state radio and television cable backbone network (hereinafter referred to as the country dry network) now has nearly 40,000 km cable line, accessible in 31 provinces. According to the plan, the national network using SDH and DW dry DM A platform technology development, and on this basis, building up to the B platform, IP network technology first phase. It is currently connected to the country's 14 provinces, to the core / backbone hierarchy, with the Chinese in Beijing Telecommunications And China Netcom Internet, to carry out value-added services for system-wide support. In this paper, dry country B platform, a project network planning and construction experience, focused on the planning and construction of data networks, radio and television during a number of issues should be considered.
1, business planning Data network can carry out major operations, including Internet access, data center, VPN, IP telephony and multimedia services bearing such as conducting business planning process, in conjunction with their own radio and television industry, users and network characteristics different types of data services on a breakdown, and as far as possible to make traffic distribution and development is expected to guide the network's pre-construction planning and follow-up. Internet access
Users who do not have direct access to the network's main network operators and direct ownership of the user's local network operators, the former mainly for its partners to provide access or through service, in fact, is the bandwidth wholesale, after who is the family or directly to users Office Access services.
Data Center (IDC) IDC operations, including Server Hosting, web hosting, virtual storage, for radio and television network operators, the objective production of film and television industry can rely on the contents of the advantages of combining the local network needs to carry out the actual content to audio and video content-based hosting business.
Virtual Private Network (VPN) IP-VPN present mainly based on IPSec VPN and MPLS VPN and other types, which MPLSVPN flexibility, safety and efficiency advantages gradually widely accepted by the market and become the major data network operators one business. The exchange of digital television programs and e-government radio and television networks such as VPN services can be a major area of development.
IP Phone And Internet access services similar to users who do not have direct access to the network's main network operators, mainly for the local launch IP telephone services to provide hosted services to network operators. Carried out in the local network to Broadband Phone As the representative voice access services despite the tremendous market potential, but there are policies, funding and Competition Risks involved in radio and television network operators to deploy when the need for careful careful.
audio and video services Broadband access network technology with the development of the original text-and image-based Internet applications, gradually began to transition to audio and video-based multimedia applications, bearing in IPTV Audio and video services as represented by the major carriers are currently an important development direction of the data network, data network radio and television certainly is an important direction of the business.
2, network technology choices Data can be divided into long-distance trunk network, and Metro Link network types, in the long-distance trunk data network construction, no doubt will require high-speed, high capacity, long-distance transmission technology do support the current model of choice mainly the following.
IP over ATM The basic principle is to encapsulate IP packets ATM cell, the ATM layer for transmission channel, the main advantage of this approach can provide good bandwidth management system, effectively reuse a variety of different types of business , with flow control balancing and fault recovery. A few years ago in a period of low user bandwidth requirements, this approach has a certain rationality. But the drawback is too much protocol level, the cell tax led to lower transmission efficiency, while managing high complexity, the complexity of equipment and higher.
IP over SDH This way IP packets by link layer protocol (eg PPP) package directly to the SDH frames, and to cut the ATM layer, eliminating the cell tax overhead, and thereby improve the transmission efficiency; In addition it provides a variety of protection mechanisms to provide routing in the transport layer security protection, effectively improve network security, is to build long-distance high-speed backbone network of the main technologies. Currently on the market more mature products business transfer rate of 2.5Gbps SDH and 10Gbps, 40Gbps of SDH products though have been commercial, but the relatively high cost.
IP over DWDM
Basic principle of this approach is to route an IP corresponding to a wavelength of light is the protocol level at least, the most efficient mode of transmission, although it is not the same as SDH protection mechanisms, but by the data Network equipment Independently routing security features, but it can greatly improve the fiber optic cable transmission capacity and reduce maintenance complexity, is to build long-distance high-speed backbone network of the main technologies. Currently on the market more mature products business DWDM transmission capacity
