Introduction to PTN Technology

At present, the PTN technology is widely used. Many people may not understand the difference between the PTN technology and other technologies. It does not matter. After reading this article, you will certainly have a lot of GAINS, I hope this article will teach you more things. MSTP, enhanced Ethernet, three-layer IP network, and PTN are four IP-based transmission technologies capable of carrying 3G data. They are in full service operation and full IP environment, which technology is the best transfer bearer solution? Currently, the most popular PTN Technology in the industry is the PTN technology. But where did the PTN technology win the other three technologies? Xu Rong, an expert of the China Mobile Research Institute, made a detailed comparison and analysis.

Comparison and Analysis of PTN technology and MSTP

Early MSTP added the passthrough data service function on SDH devices to realize data service transmission. This network is weak in network bandwidth utilization and data processing. Later, the layer-2 switching function was added to achieve layer-2 data exchange and convergence. in the true sense, MSTP networks began to form.

MSTP is different from SDH in that MSTP uses EthernetoverSDH technology such as green code and VC cascade, and bandwidth static configuration management technology such as LCAS, it can realize transparent data service transmission and some simple business aggregation functions. However, the degree of MSTP grouping or IP is not "thorough", and its IP is mainly reflected in the user interface (that is, surface segmentation ), the kernel is still a circuit switch (that is, a kernel circuit ). This makes MSTP less effective when carrying IP Grouping services, and cannot meet the needs of the 3G and full-service era dominated by a large number of data services.

MSTP problems: Ethernet QoS support is not supported, and only limited CoS capabilities are provided. Compared with SDH's 50 ms self-healing time, Traditional Ethernet's fault recovery time is too long, it is not suitable for transmitting voice and video data. The service bandwidth granularity is limited by VC, and generally the minimum is 2 Mbit/s; the 4096 address space of VLAN limits the scalability of core nodes and is not suitable for Large Metro public network applications. When nodes are in different locations on the ring, access to their services is unfair; MAC address learning/maintenance and MAC address table affect system performance. Traffic Control Based on 802.3x is only for point-to-point links and cannot provide end-to-end traffic control; multi-User/service bandwidth sharing is not available for local interfaces, and the entire ring business cannot be shared.

PTN technology solves the problem: PTN technology introduces real QoS into Ethernet services, uses layer-2 MPLS as the intelligent adaptation layer, and uses advanced PacketRing), PBT and other technologies to achieve Protection Switching at the business layer less than 50 ms. Prospect prediction: MSTP has market space in the short term. However, due to the large number of existing Ethernet interfaces/architectures that are easy to use, more and more businesses with QoS requirements will rely on the Ethernet platform. Therefore, new Ethernet services are bound to develop rapidly. It is also an inevitable trend to provide new Ethernet service support in the PTN technology system. The PTN technical solution meets the needs of new businesses in the city. It provides operators with an IP-based grouped transfer solution with QoS Assurance from edge access to the core.

Comparison and Analysis of PTN technology and enhanced Ethernet

Enhanced Ethernet is a step-by-step development of Ethernet technology. Its core idea is to expand and transform Ethernet to provide some telecom-level service transmission functions. Connectionless enhanced Ethernet technologies include PB (QinQ), PBB (MACinMAC), Ethernet protection, and OAM (802.1ag.

Ethernet enhancement: there are no good solutions for end-to-end service configuration, security and reliability, service quality assurance, and clock synchronization across the entire network, it is still a long way to go from a real telecom-grade network. The problem solved by PTN: the PTN technology is connection-oriented, and can meet the requirements of telecom-level businesses and telecom-level networks. However, Traditional Ethernet and local enhanced Ethernet cannot be called group transmission networks. The PTN technology transforms non-connection, forwarding behavior unknown, weak control, or uncontrolled sub-network into a connection-based, predictable behavior, and Controllable network suitable for transmission, and enhanced the ability to communicate with existing technologies (such as IP/MPLS and SDH/MSTP.