Creating a new Generation optical Network Service platform

At present, the integration of optical and IP technology has become the inevitable trend of telecom network development. On the one hand, optical fiber can achieve higher service density, reduce the whole network cost; On the other hand, the new generation of business system should be optimized for IP service, and can integrate the current business.

Telecom operators are looking for solutions that reduce the cost of existing services and provide higher total bandwidth and flexibility for new applications and services. Cisco full optical multi-service edge and transmission (COMET) network solution components can meet these requirements from the city edge to the long-distance network. The new multiple service delivery platform (MSTP) can support a variety of time division Multiplexing (TDM) and data services, scalable SONET/SDH and integrated dense wavelength division multiplexing to replace the original transmission platform based on SDH alone.

IP technology is deep into the telecommunications network, the future of online data services, especially the IP business will become the mainstream, which has become the consensus of the industry. At the same time, the traditional TDM transmission system based on time division Multiplexing will remain in the future for quite a long period. One of the important issues that telecom companies are facing in the field of transmission is how to construct a transmission system for future IP services on the basis of supporting the existing TDM system. Cisco's new multi-service supply platform has complied with this trend. This innovative technology provides time division multiplexing and statistical multiplexing on the same platform, enabling operators to provide high-speed data services and traditional TDM services simultaneously on a single optical transmission device.

The future of the network is based on IP-mainstream. The most typical feature of IP services is suddenness, and it is unbalanced. These business characteristics require that the future transmission network must be able to quickly adjust the network topology according to the flexible changes of the business, and allocate bandwidth in real time. The early network equipment is mainly for TDM traffic, can only take advantage of the entire network of a part of the bandwidth, so once the user segment a large number of high-speed data access scheme (such as ADSL), will be due to the bandwidth convergence efficiency is very low or the application of excessive capacity of the transport backbone caused great pressure. At present, some operators are establishing and maintaining independent TDM, IP, ATM, Frame Relay network, resulting in a large amount of money and cost of waste, while the network efficiency is not high. Traditional SDH systems cannot easily be extended according to the change in bandwidth requirements, so operators that have installed SDH networks must spend large sums of money to upgrade or replace each node in the network with high-capacity devices if the bandwidth is exhausted quickly. At the same time, they are faced with the daunting challenge of predicting the demand for bandwidth over the next few years, and the change in user demand is very rapid. Connecting these huge transport solutions to DWDM for long-distance transmission can result in more expensive and complex end-to-end optical networking. These traditional schemes force service providers to support a wide range of products that are not flexible, while also wasting valuable network bandwidth by using outdated equipment.

Cisco's new multi-service delivery platform ONS15454 effectively solves this problem. It integrates data, voice and video services, and can be efficiently assembled on a transmission network for easy transmission. Services, including TDM, IP, and video, can be easily handled in multiple general-purpose slots in CiscoONS15454. A variety of data streams can be transmitted separately or jointly, can also be transmitted in a one-to-one designated bandwidth mode, or transmitted in a centralized mode, with no restrictions on the excess bit rate. It has many characteristics that adapt to the demand of new generation telecom network.

Wide range of rate support. It can be configured into a 155Mbps system, can also be 622Mbps, 2.5Gbps or 10Gbps group road system, as long as the replacement of the light card can be achieved, without changing the system backplane, the main control circuit board and time slot intersection board, and the Group of light cards and the branch light card is the same board card. Even under the 10Gbps system configuration, can still up and down E1 circuit. At the same time, 2.5G and 10G optical interface cards can be configured into DWDM prefabricated optical mouth, which is very convenient to improve the system's transmission capacity. In particular, ONS15454 provides the most cost-effective and practical DWDM system model for use in metropolitan area networks: DWDM based on non-optical wavelength converters. The business development of the metropolitan Area network is usually very fast, and the regional development is uneven. This requires the network system to expand flexibility, high cost performance. The ONS15454 provides modulated 2.5G, 10G optical signals, which are multiplexed into a pair of optical fibers by a passive DWDM filter, which can form the most cost-effective DWDM system.

Strong networking capabilities. ONS15454 not only supports a wide range of rate interfaces, but also provides a flexible networking approach: Common chain, point-to-point, plug-in/multiplexing, ring, mesh, and any combination of them, as well as channel protection and multiplex segment sharing protection. In addition, ONS15454 can support multiple loops on a single device. This minimizes the number of devices and the number of unnecessary relays, simplifies the process of design and system upgrades, and provides protection for loops to loops.

Very high reliability. In the ONS15454 system, the dual backup design is adopted in the main control, timing unit and time slot crossover unit, and the business unit adopts the 1+1 or 1:n protection mode, which avoids the node single point fault of the transmission system fully.

Multi-business support capabilities. ONS15454 not only adapts to the need of traditional business with telephone exchange, but also supports the demand of large data business. such as digital video broadcasting, IP network interconnection and so on. ONS15454 not only provides point-to-point, point-to-point, and more transparent Ethernet connections, but also has Ethernet port Convergence, two-tier switching, and "etheric shared ring" capabilities.

In addition, ONS15454 has powerful time-slot crossover capability and can be used as a small DXC device, which makes it easy to compose complex network topology. It is the industry integration extremely high MSTP product, the hardware structure is compact, the frame size is small, whether is the hardware installs or the network management software use, all is very easy.

Cisco's new generation of SDH technology provides a transport network that evolves from a single TDM circuit network to TDM and other high-speed data services, providing an integrated transmission and management solution on a single hardware platform to help operators significantly reduce their device components, thus greatly improving the efficiency of the novel network operation. It enables service providers to quickly add optical interfaces to any place they need in the network, transforms the now rigid, TDM based transport network into a flexible data-intensive transport network and brings together data, voice, and image interfaces that enable service providers to add services wherever they are needed in the network.