In recent years, "triple network integration" has become one of the biggest hot spots in the entire communications industry. Three-network integration includes business integration, terminal integration, network integration and many other aspects. The integration of the three networks is a gradual and progressive process. Among them, the integration of the "network" is the foundation of the integration of the three networks, which is very important. Shanghai Bell follows the guiding ideology of “high starting point, high level and high efficiency†in the construction of radio and television networks and the principles of business traction, highlighting key points, overall planning and staged implementation, and proposes a highly efficient network based on the original triple-play business architecture ( High Leverage Network) evolution solution. From the access, aggregation, edge, core and other levels to realize the end-to-end improvement of broadcast and television network technology, build a high-performance and highly controllable multi-service bearer network for broadcast and television, and lay the cornerstone for the entire "three network integration".
The high-efficiency network solution provides the best path for smooth upgrade, transformation and integration of the entire network from end to end. On the access side, the existing coaxial cable is used to provide two-way, high-bandwidth, non-blocking access to meet the user's experience of various services; at the edge, the integrated edge gateway realizes unified user management; the core level, T Bit-level core routers and 100G long-distance transmission based on Bell Labs' innovative technology provide future-oriented traffic bearers and fully meet the needs of business development at all stages of broadcasting.
Integration of multiple access technologies
First, on the access side, the PON + EoC solution, the optical fiber is closer to the user, and the massive bandwidth is easily obtained. As the third-generation OLT system with application enable mechanism, 7360 ISAM FX can meet the requirements of the integration of multiple access technologies, supporting multiple access including GPON, EPON, 10G GPON, 10G EPON, P2P (point-to-point) and other access technology. At the same time, the OLT can provide more powerful processing capacity, higher density line cards and ports, each slot can provide up to 16 PON ports, a single chassis can provide up to 256 PON ports, each slot bandwidth up to 160Gbit / s, NT matrix switching capacity up to 2Tbit / s, are the industry's leading. At the same time, the platform is equipped with a built-in OTDR function to support efficient and economical access network operation and maintenance. In addition, the 7360 ISAM FX equipment has embedded AE business enablement processing chips, which continuously provide innovative business models for broadcast and television. Shanghai Bell's EoC solution is an EoC access solution that uses low-frequency modulation and is based on HomePlug AV technology. The CATV signal and IP data signal can be accessed through the central office equipment, and the mixed signal is output to the coaxial cable distribution network. Together with the EoC terminal equipment (CNU), the last 100-meter high-speed interconnection network solution is formed. This solution can realize the broadband access of cable TV users, and facilitate the broadband and bidirectional transformation of the cable TV network, and effectively play the advantages of cable TV network bandwidth, low cost, and easy popularization.
Create efficient and flexible optical transmission
At the transmission level, the future broadcast and television network will mainly carry high-definition television, digital audio programs, new interactive programs, high-speed data access and voice services such as "triple network integration", whether from greater capacity granularity, QoS capabilities, or data processing capabilities. All of them have put forward new bearing requirements. The end-to-end high-efficiency transmission network solution of Shanghai Bell is aimed at the actual situation of the radio and television network. From the perspective of new technologies and optimized network levels, it creates a new, safe, reliable, efficient and flexible radio and television Next-generation optical transport network.
In national trunk lines and provincial trunk lines, the application of 100G high-speed WDM systems will become mainstream. Shanghai Bell 100G 1830 PSS coherent optical wavelength division platform first selected the industry's preferred 100G modulation format PDM-QPSK, halved the baud rate to 25 ~ 28G, and achieved 2bit / Hz transmission with little damage. Through the use of coherent optical detection technology and the use of Bell Labs' unique DSP algorithm and first-class FEC error correction technology, it can effectively improve the optical signal noise and receiver sensitivity, suppress various nonlinear effects of the system, and greatly improve the overall transmission performance of the system. At the same time, it also ensures a smooth evolution of the network from 10G to 100G. In the metropolitan area network, we recommend using the OTN + PTN method to build the metropolitan area network.
At the convergence access layer, the trend of packetization is becoming more and more obvious. The PTN technology of packet core is already the main technology option generally recognized by the industry. At the core level, traditional Gbit-level capacity will become the main bandwidth bottleneck, requiring larger capacity Tbit-level business processing capabilities and more flexible scheduling and switching capabilities. Shanghai Bell's end-to-end 1850 TSS PTN solution, a full range of products covering the core layer to the access layer, released the world's first PTN equipment in 2005, and has been widely deployed in major domestic and foreign operator networks.
Building a differentiated IP network
At the service control level, we will transform the "best effort" single service into a differentiated service per user / service controllable with the new broadband services of public users such as VOIP voice and video (such as IPTV). Need, IPoE's bearer mode is more suitable for such business needs than PPPoE. At the same time, multi-service oriented bidirectional hierarchical QoS puts forward higher control capability requirements for gateway devices. The simple QOS mechanism for a single Internet access service on traditional BRAS and Performance limitations can no longer meet the requirements. The TR101 architecture of the Broadband Network Forum proposes the evolution of network edge service control equipment from a single device supporting PPPoE (domestic operators are mainly BRAS) to a broadband network service gateway-BNG device (supporting both PPPoE and IPoE). The 7750 SR is a BNG device in the true sense. It can support PPPoE and IPoE at the same time, breaking the difference between traditional SR and BRAS devices, and implementing all the functions of BRAS and SR from a single device in hardware.
In addition, Shanghai Bell provides the next-generation IP core router platform, 7950 XRS. This series of router platforms is small in size and high in efficiency, and is a platform for the future. As the flagship product of the series, the 7950 XRS-40 supports up to 32Tbit / s of switching capacity, and the whole machine can support up to 160 100GE ports. Its port density is 5 times that of the current conventional core routers. The backplane and optical of the 7950 XRS-40 The interface is designed to support single-slot capacity of 2Tbit / s and multi-chassis clustering, so that the entire platform can be expanded to 240Tbit / s in the future, and supports ultra-high-speed interfaces such as 400GE and 1Tbit / s. Relying on the latest chip technology (FP3) and advanced system design, the 7950 XRS reduces energy consumption to only 1 watt / Gb. Using 7950 XRS to introduce 100G or even 400G, 1000G and other high-speed links into the IP transmission network will greatly promote and simplify the evolution of the core network, thereby helping operators easily cope with the growing customer demand.
Extensive deployment of NGB projects
Shanghai Bell has been devoted to helping the construction of the triple play of radio and television. In recent years, it has actively participated in triple play projects across the country. In the Shanghai Oriental Cable NGB (Next GeneraTIon BroadcasTIng, the next generation broadcast and television network) project, the 7750 SR router and 1830 PSS OTN equipment rely on the 3T bit concept (that is, the data, transmission and access platforms all reach the T bit rate) and superior performance , As the key equipment of the core layer and the aggregation layer of NGB metropolitan area network and wavelength division transmission respectively. At the same time, Shanghai Bell exclusively undertakes the construction of the Nanjing Broadcast and Television ASON core platform construction project. In Shandong Radio and Television, PON solutions and OTN solutions have also been deployed on a large scale. In the global market, Shanghai Bell ’s solutions are widely used by various cable operators, including cable television service providers in Mexico, CableVision in Argentina, CableVision in Argentina, and Mostelecom.
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