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ASON (Automatically Switched Optical Network) is a concept for the evolution of transport networks which allows for dynamic policy-driven control of an optical or SDH network based on signaling between a user and components of the network. 〔(ITU-T Promotional Document ) 〕 Its aim is to automate the resource and connection management within the network. The IETF defines ASON as an alternative/supplement to NMS based connection management. 〔 Automatically Switched Optical Networks (ASON) and Generalized MPLS (GMPLS," Route into Common Future" - Slide 6 () 〕 == The Need for ASON == In an optical network without ASON, whenever a user requires more bandwidth, there is a request for a new connection from the user to the service provider. The service provider must then manually plan and configure the route in the network. This is not only time consuming, but also wastes bandwidth if the user sparingly uses the connection. Bandwidth is increasingly becoming a precious resource and expectations from future optical networks are that they should be able to efficiently handle resources as quickly as possible. ASON fulfills some of the requirements of optical networks such as: * Fast and automatic end-to-end provisioning * Fast and efficient re-routing * Support of different clients, but optimized for IP * Dynamic set up of connections * Support of Optical Virtual Private Networks (OVPNs) * Support of different levels of quality of service ( These requirements are not restricted to optical networks and can be applied to any transport network (including SDH Networks). )〔Automatic Switched Optical Networks: functionality and architectural components, Roberto Clemente and Giuseppe Ferraris , 2nd Eurescom WDM Hungarian Workshop Budapest, March 27th 2001 () 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Automatically switched optical network」の詳細全文を読む スポンサード リンク
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