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OADM and optical cross connect, etc. W DM Network elements to be more like the corresponding function of SONET / SDH network elements. On the synchronous optical network / synchronous digital hierarchy (SONET / SDH) will soon come to a dead end the rumors have been rampant, however, so far, on Telecommunications Transport market and the various predictions made Operation Business plans are clear evidence of the purchase of these rumors and how far off the mark. Currently, worldwide metro operators still the SONET / SDH transmission network as a set of major programs, and network operations, network maintenance and the profit has already accumulated a wealth of valuable experience. Recently the focus of further research and development equipment, SONET / SDH network to adapt to the changing times. In particular, by improving the SONET / SDH transmission network, making the network more suitable for transmission of data signals transmitted in support of the new data services, while driving the network toward greater efficiency and flexibility of the direction. This trend will increase the SONET / SDH data transmission network in the flexibility and elasticity, while use of the transmission network operator in the SONET / SDH bandwidth management on the handy. In rehabilitation SONET / SDH functionality and operation mode, there are some features that embodies the rational design of WDM systems based on the need for SONET. Devices and subsystems manufacturers must understand and adapt to these new features and functionality, they will be introducing the next generation of WDM systems. WDM market entry barriers WDM market taking into account the traditional barriers encountered?? All the difficulties with the laying of the WDM system, in order to lay a large number of WDM systems, clear that the system must be improved, so improved WDM systems essence, closer to SONET / SDH. WDM system, the laying of the past, such a bias exists, that is laying WDM is the last option is the choice of last resort, to eliminate this bias lies in the elimination of these barriers. First laid point to point WDM system because the application appeared in the "exhaustion of capacity" or to "Multiplexing fiber-optic" (see Figure 1). In this case, WDM system, the source of all the wavelengths are the same point and end point. Operators have to route between multiple wavelength WDM system?? In other words, in order to flow between the number of telephone office, "Express", to establish the optical sub-linear or circular interpolation WDM link system. For these applications, the first-generation point to point WDM solution is not ideal, because of the need for all through the expensive optical wavelength light (O EO ) Regeneration. Second-generation WDM OEO regeneration solutions trying to solve too many problems, that is, through direct connection to all pass through the wavelength nodes, so do not need to reuse each wavelength multiplexing operation of reconciliation. These systems use a fixed optical-drop filters, these filters only-drop selected wavelengths and let the rest through. However, in order to eliminate some of the effects caused by cascading filters, such as the filter bandwidth is narrow, loss is too high, ring lasing, we need to elaborate on each of the design wavelength. Figure 1 WDM systems applications, from simple point to point over evolution, and structural changes undergone during its limited from the flexibility to provide dynamically reconfigure the application process, evolved after the application of WDM systems and SONET / SDH to provide similar control and business options. From the operator point of view, a particular node in the provision of new wavelength services, if the use of existing fixed OADM, requires a lot of labor and a large number of optical fiber jumpers. Node in a separate 3-4 wavelengths, we must use WDM-drop filter. If there is no pre-installed WDM-drop filter, and did not provide the necessary pre-operational Test , Then the opening of new wavelength services will become extremely complex process. This not only need to increase the WDM-drop filter circuit boards, also must use a lot of fiber-optic wiring board, a specific connection device and the fiber-optic jumper jumper rack. Transplanting to a fixed wavelength through wavelength change is very time-consuming, and may have a tremendous impact on operating rules. Addition to the existing system, add a new wavelength channel, operators will face the task of making the design more difficult problem because the need to address new channel wavelength regeneration issues. These limitations make preparation, installation and upgrade process becomes cumbersome and error-prone, and usually requires a long lead time, high installation costs and a large amount of manual. Recent innovation has brought some of the third generation of dynamically reconfigurable optical add drop multiplexing (ROADM) and optical cross connect (OXC) solutions, third-generation program with a fixed single wavelength granularity to solve OADM inherent in those problems. In this way, operators in the management of the wavelength WDM system as in the management of SONET / SDH systems, like the time slot?? Avoid the traditional WDM in the artificial-consuming and error-prone business delivery. Like SONET to WDM Operators leads to a existing ROADM and OXC network element in the emergence of the network element address of the remote programmability, single wavelength-drop size, as well as network design, rather than once for each wavelength design requirements. The former can be controlled by the demand of each wavelength to achieve all-optical switching, the latter through the fully automated optical layer needs to achieve, including not only a programmable optical add drop multiplexing, but also for each separate wavelength dynamic gain flattening (DGF), in order to achieve automatic power control, in addition to optical amplification system automatic gain control (AGC), to achieve transient control. Achieve such Automation Level, operators do not have to face the traditional barriers encountered WDM, thus avoiding labor-consuming but error-prone process. In summary, operators need is essentially more like SONET / SDH to WDM systems. Engineers from the network perspective, this means that the increase does not need to re-design of the new wavelength WDM system, optical layer, and as SONET / SDH systems, as only when you install the system design can be the only one optical link , but also allows remote configuration, that is, the location of a particular TDM channel configuration-drop path or direct path, the only easy The e-commerce company in China offers quality products such as USB Data Link Cable , Blackberry Mobile Battery Manufacturer, and more. For more , please visit SamSung Cell Phone Accessories today!
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