PTN Layer 2 technologies can be seen as a simplified version of the mechanism and OAM enhancements combination. In the realization of the technology, the two main technical PBT and T-MPLS will be a substitute for SDH, rather than the IP/MPLS competitors, similar to its network theory, are based on end to end, bidirectional point to point connection, and provides a central management, within 50 milliseconds protection switchover; either can be used to implement SONET/SDH to packet switching transition, in the protection of existing transmission resources, it can be similar to the existing SDH network functions to implement the network packet switched network transformation.

Currently, China Mobile's existing network has more than one million sets of PTN equipment, how to make the current network PTN devices are fully utilized, this is the issue of China Mobile focus.

PTN packet transport product is designed, its main features is reflected in the following areas: flexible scheduling networking capability, multi-service transport capabilities, comprehensive carrier-class security, carrier-class OAM capabilities, with business sense and end service provisioning management capacity, low cost per bit transmitted.

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.

It should be said OTN and PTN are two completely different technologies, technically speaking we should say no contact.

PTN (Packet Transport Network) refers to an optical transport network architecture and specific technologies: IP traffic between the optical transmission medium and the underlying set a level for which the packet of bursty traffic statistical multiplexing and transmission requirements Designed to packet core business and supports multiple service provider, has a lower total cost of ownership (TCO), while inheriting traditional advantages of optical transmission, including high availability and reliability, efficient bandwidth management mechanisms and traffic engineering, convenient The OAM and network management, scalable, high security.