With business demand drive network develop to ALLIP, packetizing transmission technology become the next main IP carrying technology representation the general trend. In metropolitan area network, where the business demand is the most complex, violent in technology clash, ceaselessly emerged new technology, introducing any advanced technology can not accomplish at one stroke, especially in the face of large and mature SDH/MSTP network, keeping on extend the coverage of IP metropolitan area network as well as rising full service access network, positioning PTN in network and other network relationship need to rethink. At the same time, along with the PTN entered the commercial stage, based on the PTN device specific networking strategy has become the focus of the mobile operators. On one hand, PTN technology can provide the whole telecommunication network to the IP, broadband evolution telecom technical support, on the other hand it can effectively reduce the construction and maintenance cost of the IP, broadband service. PTN technology keeps the traditional SDH network characteristics: good network development, lavish operation and maintenance (OAM), fast protection switching, using network management system to establish a connection. Meantime it increases the adaptation data business characteristics: packet switching, statistical multiplexing, group QoS method, and flexible control surface. The traditional Ethernet and Ethernet technology is unable to compare with these advantages. In a fact, PTN technology has recognized as one of the next generation network technology , will be widely used in Metro construction in future. this paper basis on analyzing PTN network construction in the metropolitan area network, discusses the key issues in the construction of PTN network, including the operation level demand, implementation of the key technology, optional technical scheme and introduction of the application strategy analysis . after this, analysis the existing network structure based on a metropolitan area network , on the basis of understanding basic ideas of construction PTN network in a metropolitan area network put forward feasible construction scheme.
Key words: metropolitan area network; PTN network; network planning; next generation network; feasible scheme