puma kart cat ATM network control _859

Control of ATM network

, Users, operators and manufacturers have benefited. ATM technology revolution will be the overall development of communication and rapid catch up with the world advanced level provides an excellent opportunity. Second, the control of ATM network goal is to ensure the quality of user services network resources while ensuring efficiency and flexibility of use, which is the most prominent advantages of ATM. But this is a contradiction between the two,[link widoczny dla zalogowanych], and in the integrated business environment is particularly prominent. ATM control technology to solve this contradiction and the most important means of achieving goals ATM. Control is the most important faced by ATM and the most fundamental challenges. ATM control problem is very complex, because: ① the existing types of business and the future emergence of new service features vary, some are even unknown, leading to the requirements of network and service level of diversity;. ② broadband network covering a broad range of speed and tied the band led to delay product of high value; ③ control must be implemented in the broadband high-speed environment, limiting the control method (algorithm) is more complex; ④ must accept the constraints of communication network structure limit the scope of control options; ⑤ control failure caused the loss of much more serious than the low-speed network;. ⑥ A control with the existing communication problems completely different, STM control technology can not be directly used for ATM control of ATM control technology must be developed. Third, the control objectives and functions of ATM network control objective is to ensure the efficient and flexible use of resources under the premise of a variety of users need to ensure quality of service. Factors that damage the quality of service both congestion and therefore friction. Communication network congestion is a state that at this time communications network transmission capacity in some parts of the business decline, has not been connected to ensure that the various quality of service; failure is another state communications network that communication network at this time has lost business in some parts of the transmission capacity. Control functions can be divided into: ① traffic control: traffic control to avoid the occurrence of congestion; ② congestion control: congestion control efforts in reducing congestion occurs, the intensity and shorten its duration; high-tech communications 1994.12 . ③ self-healing control: in the absence of intervention, as soon as possible to recover from the failure of service delivery capacity failure. Way to achieve control of the control structure that ATM is a multi-level structure. There are two forms: one structure, the structure of the second implementation of all control functions and strive to have the following characteristics should be simple (Simplicity), flexibility (Flexibility), flexibility (Robustness) and control (Controllability). Control technology that is specific ways to achieve control. Control technology is the hottest on the ATM study, has been carried out worldwide, Joseph Kwong, made a number of control methods, such as connecting control {6I permission to use parameter control,[link widoczny dla zalogowanych], priority control, traffic control form, routing control, flow control, network structure, control, operation and maintenance control of high-level protocol control, congestion control from the bird control, quality control and other categories. All the control are reflected in the final network resources (frequency bandwidth, storage space, processing power and processing sequence, etc.) distribution strategy. Essentially control the different ways different ways of resource allocation. Fourth, the problems traffic control and congestion control research in recent years the international community has widely started. The objectives and functions of control with more in-depth research, made a number of specific control. Control of self-healing more and more attention has been paid, the goal of self-healing, research methods,[link widoczny dla zalogowanych], design rules and other basic issues are involved. But research is still relatively basic, the problem is far from resolved. Many problems of smell is not perfect, and some involving investment; many research results are directed at specific or local environment, in the control of the entire network environment,[link widoczny dla zalogowanych], many existing studies have failed {method has clearly revealed its limitations ,[link widoczny dla zalogowanych], lack of effective research methods. At present, studies are concentrated in the ATM control level, while the high-level protocol control is rare. However, the study of the critical importance of high-level protocol control has become increasingly evident, and in a broader structure of the. This is because the network control, operation, management and maintenance aspects of the Agreement will constitute the information communication network with the structure of the broadband integrated services environment that is both operational and management for a unified software platform. This idea in the main business-oriented intelligent network IN and the main network management for telecommunications management network TMN has been fully realized. The key research questions: (1) must break the existing research methods, proposed new ways of operational control; (2) network control structure, the interaction of various control technologies and reasonable comprehensive {(3) crowding and self- more description of the performance; (4) control the evaluation criteria and evaluation methods; (5) an information network structure.

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