The latest application of telecom-grade Ethernet in IP metropolitan area network

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Since 2006, the Shanghai Research Institute of China Telecom began a new Ethernet pilot, telecom-grade Ethernet has been widely concerned by domestic operators. Considering the new business-driven network transformation, China Telecom in the 08 switch selection before bidding test, attaches great importance to the manufacturers of Ethernet switch products related to the telecommunications level characteristics of the test, and China Netcom from March 2008 onwards, has also been in several provinces to carry out the pilot test of telecommunications-grade Ethernet. China Mobile, starting from the fourth quarter of 2007, the Headquarters Research Institute began to investigate the technology and products of various manufacturers, China Mobile is expected to be from the IP metropolitan Area Network construction, MDCN transformation and the base station IP load and so on, can be said that China Mobile is widely understood, full embrace of telecommunications-grade Ethernet From our understanding of the situation, moving into the telecom-grade Ethernet, and manufacturers of the interaction is very strong, the factory equipment technology research is also very in-depth, including the clock over IP and other cutting-edge technology. Since 08, Changsha Mobile, Qinhuangdao Mobile, Quanzhou Mobile and so on have used the telecom-grade Ethernet to carry out the construction of IP metropolitan area Network pilot.

The following is referred to as CE for Telecommunication grade Ethernet (Carrier Ethernet).

The latest application in IP metropolitan area network

Telecom-grade Ethernet for FTTx (EPON OLT) voice service convergence (and light into the copper back, etc.)

At present, the popular multi-service Epon Olt products are divided into two types: GE broadband interface and FE voice interface. For GE broadband interface, if the actual flow is not more than 1GE, you can first converge through the convergence switch, then to bras, if the traffic exceeds 1GE, then epon olt straight bras, the middle does not pass the convergence switch.

For the Voice service of Fe port, it can be connected to the telecom-grade Ethernet ring via double uplink, and the Ethernet loop is connected to two SR by double Uplink.

Telecom-grade Ethernet is applied to converge Olt voice service, and compared with traditional double star network, its main benefits are as follows:

1. Save a lot of resources

Save a lot of business router GE ports. It turns out that each access pop point requires a GE Port of 2 Sr, and the CE network requires 2 GE ports per 4-6 pop points on average.

Save a lot of fiber resources. The original star network is very consuming fiber resources, the increase of circular convergence network, save a lot of fiber resources.

2 Reliability Enhancement

The CE scheme supports ring network and access dual Attribution 50ms protection switch, which greatly enhances the reliability of the large client access.

3 QoS Capability Enhancement

Support for flexible q-in-q, in-depth analysis and other powerful business differentiation and QoS features, to protect the key business and the business isolation of large customers and quality of service. With the hardware efficient dynamic multicast function, IPTV and other streaming media business provides a good support, can meet the needs of future business development.

C3, C4 network optimization (including rural informatization)

The telecommunication grade Ethernet is applied to the business carrying network of city to county or county to township. Epon OLT, DSLAM, switches and other equipment access to the business, through the CE Ethernet Ring network for transmission.

The benefits of this application are as follows:

Conserve fiber resources. Ce used in county to township and other rural networks, due to the distance between adjacent nodes (more than the city is far more), so the ring network of fiber resources savings, compared to the traditional star-type network, the effect is very obvious.

Increased reliability. CE support 50ms protection switch, greatly enhance the key business (such as softswitch voice, IPTV, etc.) reliable load capacity.

Provides a powerful multicast capability. Can be very good hosting IPTV, video surveillance, such as multicast business.

Provides strong business differentiation and QoS capabilities. Therefore, it can efficiently and securely carry a variety of services, and provide differentiated QoS service for different services.

Ce applied to large customers with the city interconnection and business convergence

Telecom-level application and large customer plane, one can solve the problem of large customer access convergence, on the other hand, can solve the problem of large customers with the city interconnection.

The advantage of the access aggregation for large clients is that it can save the port resources of the business router and access the fiber resources. To solve the problem of interconnected cities, can refer to the dotted line shown in the end to end with the city interconnection path, through VLAN VPN or PBT technology, CE can create a two-layer VPN pipeline, relative to figure three through the vpls to achieve interconnection, VLAN VPN implementation form management more convenient, at the same time the cost is much lower.

The application of CESP in Urban Star network

Ce in addition to the ring network, but also support a strong star-network capabilities. Especially for the urban area, the optical fiber resources are relatively rich, the important point proposed to adopt Double-link protection, to achieve the reliability of the business; when the trans-terminal fiber-optic dispatching is difficult, it can be protected by two devices.

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