PTN technology is essentially a packet-based routing architecture to provide multi-service technical support. It is a more suitable for IP service transmission technology, while inheriting the traditional advantages of optical transmission, including a good network scalability, a rich operation and maintenance (OAM), fast protection switching and clock transmission capability, high reliability and safety sex, the whole concept of network management, end to end service configuration and precise alarm management. These advantages PTN is the traditional router and Enhanced Ethernet technology can not match, which is distinct from the important attributes of both. We can understand the concept of PTN technology from the following four aspects.

1, the pipeline carrying the idea, based on pipeline service configuration, network management and operation and maintenance, to achieve the separation of the carrier layer and the business layer; a "pipeline + simulation" of ideas to meet the evolving mobile multi-service requirements.

First, the pipeline to ensure the bearer layer characteristics, quality of the connection can be secured. In the pipeline bearer, the establishment of businesses, the removal depends on the setup and teardown pipeline, complete connection-oriented, node forwards planned in advance in accordance with the provisions of the action is completed, no look-up table, addressing such action, at the same time reduce accidental errors, but also to ensure the entire transmission path with minimal delay and jitter, thus ensuring the quality of service. Pipeline carries also simplifies the service configuration, network management and operation and maintenance, enhanced reliability of services.

In the "Pipe + simulation" ideas meet evolution of mobile networks in multiple business needs, so as to effectively protect the investment. As we all know, TDM, ATM, IP and other communication technologies will coexist in the long-term evolution, PTN adopt a unified multi-service packet pipeline adaptation, management and operation and maintenance, in order to meet the long-term evolution of mobile services and coexistence requirements. PTN's pipeline in the concept, the service layer is always at the top of the carrier layer, with a clear structure and boundaries between the two, numerous industry experience also proved that for the completion of a pipeline carrying bearer network quality is vital important.

2, becomes rigid piping to elastic piping, improve network bearing efficiency, reduce Capex.

TDM 2G era of mobile bearer network, using VC rigid pipe, independent of bandwidth allocated to each service by its monopoly, resulting in actual operation of the network released a lot of free resources available do not come out, inefficient situation. PTN adopt a flexible conduit LSP packet exchange generated by the tag, when the full business through sophisticated QoS classification and scheduling to ensure high quality of service bandwidth priority needs met; free time in business, the bandwidth and flexibility to achieve release sharing, network efficiency has been greatly improved, thus effectively reducing the bearer network construction investment Capex.

3, with centralized network control / management alternative dynamic protocol traditional IP network control, while improving IP visualization operation and maintenance capabilities, reduce Opex.

Features mobile bearer network is the network size, wide coverage, the number of multi-site, which for network operation and maintenance is a great challenge, and network maintenance difficulty attribute directly affects Opex level.

Dynamic Protocol traditional IP network control plane for the deployment of a smaller scale, a limited number of sites, but with a more flexible scheduling requirements of the core network and bearer network appeared to be inadequate in the face, and the closer the underlying network, its more prominent issue.

First, the dynamic protocol to the traditional IP network to bring the "cloud" feature, when the network event of a failure, because they do not know the actual routing "cloud" inside and caused great difficulties to the fault location, which is huge, for Opex sensitive, and may be frequent adjustments and expansion of bearer network is undoubtedly a disaster.

Secondly, the dynamic in the technical complexity of the agreement, not only to maintain the skills of staff made a very high demand, and the number of personnel requirements for the maintenance team will be several times in the past, which will subvert the grassroots maintenance team organizational structure and manpower constitute, at the same time maintain the number of personnel has increased bring Opex increase inevitable.

Therefore, manageable, operation and maintenance of IP-based innovation precondition for large-scale network deployment is very important. Traditional IP unmanageable looks beautiful, but in fact there are too many pitfalls. IP-based mobile bearer network operation and maintenance experience must inherit TDM bearer network to network visualization rich IP network operation and maintenance means to reduce the difficulty of operation and maintenance, while achieving the maintenance team of maintenance experience, maintenance experience inheritable, which is PTN Mobile IP bearer network management operation and maintenance concept.

4, implantation of new technologies, IP-based mobile bearer padded short board in the process of carrier-class capabilities.

Clock synchronization is necessary capabilities of the mobile carrier, and the traditional IP network are asynchronous, mobile bearer network of IP Transformation must solve this short board. All mobile formats are required for frequency synchronization of 50×10-9, while some mobile formats such as TD-SCDMA and cdma2000, including also require synchronization phase future LTE, the industry through networking solution phase synchronization requirements Only IEEE1588V2 technology, the technology has become implanted in IP-based mobile bearer Required.

In fact, the ideas PTN has been proven in a large number of actual network construction practice is based on IP-based mobile bearer demands a deep understanding of the mobile bearer network of IP-based points out a viable path.