Summary
ndon optical transport network construction technology to achieve major success, this article discusses the advantages of network ndon and the relationship between SDH and OTN, ndon discussed in detail the delivery plane, control plane and network management features and progress of the plane, and finally to the strategy evolution of optical transport network to be analyzed ndon.
/> Keywords automatically switch the user network interfaces synchronous optical network service quality digital sequence
/> 2000 years later, the technology of optical network transport any new developments, particularly the automatic switched optical network (AutomaticallySwitched OpticalNetwork, ndon) the emergence of the most prominent feature is the introduction of control plane intelligence-free transmission network, to complete the routing control plane using automatic discovery, please call connection management, protection and restoration, to execute dynamic call connection for network management. ndon draw heavily on changes in technology and data, exchange, transfer and data in the three areas has added a new intersection. Manufacturers and operators a variety of technologies have been given the attention it deserves. This will be a major technological advancement and ndon discussed in detail and based on current national transmission network operator, the technical features of the evolution of the program can be discussed.
/> 1 ndon technical features 1.1 ndon ndon is excess demand for services started by the user, automatic routing, signal control is achieved by the formation of connections / degradation , finance and transfer the changes as one of the next-generation optical networks. Coupled with domestic delivery network operator status, ndon technology can solve the transmission network to the three main technical challenges faced:
/> (1) the issue quickly to provide circuit
/> ndon of the most important feature is to quickly provide a circuit, using the distributed control might give a clue of magnitude in the final two circuits, the assessment for 155Mbit / s, 2.5Gbit / s and so on. Help businesses reduce operator time to get more customers and profits.
/> (2) delivery of QoS problem sending circuit circuit current stage of basic services can not be developed in accordance with the appropriate tariff policy, which result in waste of resources, ndon and the circuit can easily share the priority to provide a service level agreement (SLA) delivery circuit.
/> (3) can provide protection and rapid recovery
/> A lot depends on the delivery of available existing SDH ring network to be protected, but the efficiency of the circuit is low, only 50%, while the cross ring circuit can not efficiently protected. Ndon can efficiently complete the circuit protection and recovery can be prepared in both magnitude and cost of change is less source circuit, a common source for circuit work to 30% to 60%, and under the SDH ring network
/> ndon 1.2 and SDH, OTN link
/> automatically switched optical network is divided into delivery aircraft, aircraft control and management satah in three parts. Aircraft deliveries including changes in the entity of the transmission network consists of network elements, is related to awareness of the establishment / change, removal and transfer of physical satah. The introduction of control plane nje is different from the traditional transport network is one of the basics, which includes a series of real-time signals and systems to realize the establishment of the connection protocol, the release of the control and monitoring, maintenance and other functions, the control plane signaling network support. Control plane and management plane satah delivery of management.
/> ndon control plane according to the OTN (optical transport network), also applies SDH, transmission network satah unified control. SDH, OTN and ndon in a relationship can be expressed in Table 1.
/> It can be seen from Figure 1, SDH / OTN separately and does not constitute ndon, to form nje it must SDH / OTN + + generation aircraft will come network management control plane (management and control of aircraft and aircraft can also delivery), three are needed. SDH, OTN aircraft deliveries only ndon technology, ndon and SDH, OTN and have no relationship.
/> ndon Technical Development 2 2.1 Transfer of technology assessment of aircraft as the current row
/> reaches 1.6Tbit / s, online capacity issues have been resolved. Aircraft shipments are sent the most famous is the delivery network node in the optical / electrical machinery reply, optical / electrical cross is the core engine aircraft shipments, a measure of processing capacity related to ndon control and processing power, the particle size.
/> Wavelength cross-current to achieve high capacity in three ways: the first is an optical pensuisan all, the second is the use of O / E / O (optical / electrical / optical) processing to achieve, the third is a hybrid method of photoelectric. All-optical detection methods due to the stability and location of damage and problems, is still in the pilot stage, commercialization will take a few moments. Opto-electronic hybrid approach to the challenges facing the same way to all-optical. Now seem to approach the use of optical / electrical / optical is a mainstream product, especially in the SDH-based optical / electrical / optical cross-machine (can be cross-VC-4 level). With the advent of large-capacity cross chip (now a cross-chip can be reached 160Gbit / s and above), the core capacity of cross-Tbit / s is not difficult. Has been oriented to market commercial products 1.28Tbit / s for example, assume that the input and output port judgment processing of 10Gbit / s, the cross-matrix of size 128 × 128 to more than the capacity of the access services abroad 1.28Tbit / s. Capacity assessment is appropriate for today’s network, although the route to the spine WDM system is 32 × 10Gbit / s, but actually with a wavelength which is usually 4 to 8, assume that each line has eight wavelengths that need to be processed, the matrix can be cross- towards the end of line 16 WDM. Although the delivery of the core node to Beijing, at this meet. Using the optical / electrical / optical VC is another feature that can cross a low level to achieve a low level of integration and penganggregatan, network more easily.
/> method of optical / electrical / optical can support high-capacity machines merentas level VC-4 and VC-4-XC pass. The external interface is generally 2.5 Gbit / s, 10Gbit / s, could G.707 or G.709 SDH interface OTN interfaces. SDH interface supports 2 fiber, 4 fiber MS-Spring multiplex section protection ring. As monitoring the status of the connection by the sender must initiate the connection point and end point detection signal quality; for SDH, OTN, you can use the SDH, OTN overhed for performance monitoring and management of damage, such as the temple of the SDH monitoring B1, J0, control surfaces need to be
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