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Usually, we define metro optical networks span from tens of kilometers to hundreds of kilometers of optical transmission network, the general Service In large, traffic concentrated in urban areas. Optical Metro bridge connected to long-distance network and access network between the corporate network to access networks in a variety of businesses connected to the operator's backbone network. In recent years, with the massive long-distance transmission backbone network construction, user access and CPN spread of broadband technology, the network bottleneck to shift to the metro, originally to carry the voice-based metro transport networks have been unable to adapt to the rapid growth of metro data services, metro network environment has changed greatly. Metro DWDM is the development direction Metro DWDM systems because with a large capacity, light levels of protection, support for multi-service, backward compatibility and other features, makes metro the future of metro DWDM optical networks has become a very important development directions. However, Metro WDM system using the most criticized point is that it Investment Cost, we can provide through MetroDWDM virtual optical fiber and physical comparison of investment options, draw further conclusions. For comparison purposes, assume that a metro from the four nodes, part of the total length of 40km, the program first, 32-wave DWDM system that offers the equivalent of 32 pairs of virtual optical fiber, the program is built 32 pairs of Physics II optical fiber. Table 1 virtual optical fiber investment costs compared with physical Note: The metro area is about the price per kilometer of optical fiber 400 U.S. dollars. Shown in Table 1, with the metro DWDM equipment to further reduce prices, provided by the virtual optical DWDM will have some cost advantages. Metro DWDM optical network to increase the utilization rate of addition (the equivalent of providing a virtual fiber optic), another very important feature is available with the protection of the wavelength channel for the transmission of data services, through the fiber than in the past data services directly connected with better QoS Protection. By comparison available for the traffic signal to send large particles such as GBE, MetroDWDM network of channels with the wavelength of the cost of protection is less than the SDH System provides protection channel. By the comparison of these two aspects is not difficult to see, when the operator network, fiber resources tight, while its network in the presence of a large demand for data services delivery, the use of metro DWDM optical network systems form the core of an ideal solution. It is noteworthy that, in tandem transport layer, transport access layer, the main business of particles include: 10M/100M Ethernet signal, 2M, 34M/45M, 155M, 622M, and a small amount of GBE interfaces. Relative core layer, the business rather scattered (single node operations is relatively small) particles smaller business, general business needs Integrate And reuse, it is not suitable for metro DWDM layer and access layer in the tandem use, (but in some cases, passive coarse WDM (PassiveCWDM) layer and access layer in tandem may apply) . Build 10G backbone transmission platform for metro With the Metro network traffic and the rapid growth of 10G SDH technology matures, most of the metro Optical Network Are beginning to use TDM10G system to build its backbone transmission network. At present, many manufacturers offer TDM10G the SDH system, but all manufacturers TDM10G equipment performance and features vary, particularly networking functions are not exactly the same, the user equipment and network construction in the selection process must address the network business flow model, select the appropriate network topology and network programs, and finally decided to support the program of the network equipment system. Here on this approach (analysis of business flow model, choose the network topology, select the appropriate equipment) specific analysis of current metro backbone network construction methods. Metro backbone network business model, such as Zhongshan Telecommunications Dongguan telecommunications local network, the backbone nodes 1-8 business basically go to a dual-core nodes A, B. Suppose the access node 1-8 business volume of 32 × STM-1, representing the significance analysis of two network programs: 4-fiber self-healing ring and multi-ring double-return type network. Shown in Table 2. Table 2 Comparison of two network programs Compare the two plans as follows: In the business-type networks were brought together, using two-way owned by the formation of multiple SDH self-healing network is a better networking program based on the SDH equipment, multi-service bearing capability, especially IP Or the perfect support for Ethernet services, so that the new system in the metro optical network SDH plays an increasingly important position. Especially in the metro access networks, the new Multi-Service Transport Platform MSTP Can support both voice and data access, is important to the metro access layer network technologies. Metro access network using SDH multi-service platform has the advantage: the SDH equipment and integrated physical layer devices, integration of multiple devices into a single node; through statistical multiplexing and TDM over-subscription business to improve the pathway central office equipment, bandwidth utilization and reduce the number of ports to the best of the existing SDH infrastructure, and reduced land, reduced power consumption, simplify the business operation and improves the system scalability, to save operating costs, in addition to increases the variety of voice and data services support. In the Metropolitan Area Network planning and construction, we must consider the actual business model of the network, select the appropriate network topology and the hierarchical structure, combined with the network scalability, economy, network equipment utilization, scheduling of flexible circuit sex, etc., choose to support the hierarchical structure of the network topology and network equipment. From the above analysis and description is not difficult to conclude that: building large-capacity, multi-service, intelligent metro optical network is undoubtedly the future direction of MAN. MAN, to a three-step Current metro optical networks should meet several requirements as follows: The network has a large capacity and good scalability; network must support multi-protocol, multi-service, multi-service metro networks to adapt to the environment; network with a variety of viability; circuit flexible scheduling and business management; network to the economy, reliability and modularity. Therefore, the construction of metro optical network must consider the following three issues: 1. For the network I am an expert from AaaNiMHBatteryCharger.com, while we provides the quality product, such as China portable phone charger , China aaa nicd battery, 15 minute aa battery charger,and more.
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