PTN (Packet Transport Network)
PTN (Packet Transport Network) refers to an optical transport network architecture and specific technology: a layer is set between the IP service and the underlying optical transmission medium, which is aimed at the burstiness and statistical recovery of packet traffic. Designed with the requirements of delivery, with packet services as the core and supporting multi-service provisioning, with lower total cost of ownership (TCO), while adhering to the traditional advantages of optical transmission, including high availability and reliability, efficient bandwidth management mechanisms and Traffic engineering, convenient OAM and network management, scalability, high security, etc.
PTN refers to an optical transport network architecture and specific technology: a layer is set between the IP service and the underlying optical transmission medium, which is designed for the bursty and statistical multiplexing transmission requirements of packet traffic. Business-centric and multi-service provisioning, with lower total cost of ownership (TCO), while adhering to the traditional advantages of optical transport, including high availability and reliability, efficient bandwidth management mechanisms and traffic engineering, convenient OAM and network management, Scalable, high security, etc. In addition, it can utilize a variety of underlying transport channels (such as SDH/Ethernet/OTN). In short, it has a complete OAM mechanism, accurate fault location and strict service isolation functions to maximize the management and utilization of fiber resources to ensure business security. After combining GMPLS, it can realize automatic resource configuration and mesh network. High survivability.
PTN products are designed for packet transmission. The main features are as follows: flexible networking scheduling capability, multi-service transmission capability, comprehensive carrier-class security, carrier-grade OAM capability, service awareness and end-to-end service provisioning. Management ability and transmission unit bit cost are low.
In order to achieve these goals, and to combine the requirements that may arise in the application, it is necessary to focus on the support capabilities of TDM services, packet clock synchronization, and interconnection issues.
TDM service support
In support of TDM services, PWE3 (PseudoWire Emulation Edge-to-Edge, end-to-end pseudowire emulation) is generally used. Currently, TDMPWE3 supports both unstructured and structured modes, and the encapsulation format supports MPLS format.
Packet clock synchronization
Packet clock synchronization requirements are the objective requirements of packet services such as 3G for networking. Clock synchronization includes time synchronization and frequency synchronization. In terms of implementation, there are currently three main types: synchronous Ethernet, TOP (TimingOverPacket) mode, and IEEE1588V2.
PTN is a packet bearer solution proposed from the perspective of transmission. Technology can revolutionize and networks can only evolve. The operator's live network is a huge MSTP network, and the MSTP nodes have been extended to all corners of the local metropolitan area. The PTN network must consider interworking with the existing network MSTP. Interworking includes two aspects: service interworking and network management and interoperability.
At present, in terms of commercialization, in view of standards, industry maturity, and progress in solving key problems, various manufacturers have invested a lot of energy in standards and products, but in general, they have introduced solutions and matured. There are not many companies in the product, and there are not many commercial ones.
OPTICO COMMUNICATION (www.fiberopticom.com) focuses on the development of fiber optic network communication product lines and provides a comprehensive solution to the fiber connectivity system components. We supply fiber optic components. All the products adopt strict quality standards in the production and inspection, ensuring excellent operation performance and good product stability, and safely and reliably ensuring the long-term use of products.
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