分封交換傳輸之DWDM環狀接取網路控制管理系統

隨著高密度波長分割多工(Dense Wavelength Division Multiplexing - 簡稱DWDM) 傳輸的光元件技術不斷地進步，DWDM技術的光纖網路也在最近幾年大量地運用在骨幹網路(Backbone Network)上，DWDM網路的控制和管理系統的發展也就漸漸為人所重視。未來DWDM一定會朝向小範圍的接取網路(Access Network)和區域網路(Distribution Network)來發展，並發展出適合分封交換(Packet Switch)的DWDM網路系統，以使得Internet protocol(IP)的封包可以直接在DWDM上直接傳送。針對此一發展趨勢，未來DWDM的控管系統勢必也需要應用在接取網路和區域網路上，這樣的控管系統所面對與管理的問題和骨幹網路相較之下有許多的相異之處，其中最主要的不同點便是在於過去骨幹網路並不是以分封交換作為傳輸型態，其控管系統也就無法針對此特性對整個網路作出比較好的控制和管理。本篇論文提出一個應用於環狀分封交換接取網路控管系統的雛型架構，控管系統利用目前使用非常廣泛的COM(Component Object Model)元件技術來實作，透過軟體元件技術，系統可以輕易地以分散式的處理方式來運作，有利於調整系統的規模。系統主要的功用是針對此一型態網路使用分封交換的特性，分配系統中各個模組功能，監測系統中各個節點與模組的運作狀態。系統將運作的資料儲存於資料庫中，使整個系統可以即時地利用先前累積及統計出來的數據，依照不斷變動的流量以及傳輸形態等網路狀態，動態地計算或調整各個網路節點所使用的頻道指派演算法，使得封包在傳送的過程之中，所經歷的塞取(add-drop)平均次數能夠降低，藉以減少DWDM網路中因暫存封包所需要作的光電轉換動作。控管系統能夠在網路流量不斷改變的環境下有效地控制暫存封包的次數，以使整個網路能夠一直保持良好的效能。

關鍵字

高密度波長分割多工；分封交換；接取網路；元件物件模組

並列摘要

Due to the rapid development of the transmission components and technology used in Dense Wavelength Division Multiplexing (DWDM) networks, some telecommunication companies extensively apply this new technique to establish their backbone network system recent years. Therefore, people gradually have regard for the management and control system on the DWDM networks. The DWDM technology will be applied to the smaller networks such as Access Network and Distribution Networks in the near future. Packet-Switching technology will be developed to transmit Internet Protocol (IP) packets on the DWDM networks directly. By the trend of this development, the management and control system of the DWDM networks should be used in Access network and Distribution network. There are many differences between backbone network and access network on the management system. The main difference is that the backbone network do not transmit its data in the way of the packet-switching. Thus, the management system of the backbone network is unsuitably used in the access network. In this thesis, we propose a prototype of management system for DWDM ring Access Network. The management objects and applications are implemented by COM(Component Object Model). By the technique of the COM, the network system is operated in the distribution processing, and is easily to adjust the scale of the system. We take the characteristics of packet-switching to design management system which includes the assignment of functions in each module, monitoring system operation status in each model and node. The statistics of the system operation data will be stored in the database. Then, the management system uses this statistics and current status of the network to calculate and adjust the wavelength assignment algorithm dynamically in each node. Thus, it reduces the average occurrence number of the add-drop and the number of the optical-to-electrical or electrical-to-optical conversion while packets are transmitted from source to destination on the DWDM network. The management system is able to control the number of the temporarily stored packets in the continuously changing environment to keep whole network in high performance.

並列關鍵字

Dense Wavelength Division Multiplexing ； Packet Switch ； Access Network ； Component Object Model

參考文獻

[1] R. E. Wagner, R. C. Alferness, A. A. M. Saleh, and M. S. Goodman, “MONET: Multiwavelength optical networking,” J. Lightwave Technol., vol. 14, June 1996.

[3] J. Y. Wei, C. C. Shen, B. J. Wilson, and M. J. Post, “Network control and management of a reconfigurable WDM network,” MILCOM’96, Oct. 1996.

[4] O'Mahony, M.J.; Simeonidou, D.; Hunter, D.K.; Tzanakaki, A., “The Application of Optical Packet Switching in Future Communication Networks,” IEEE Commun. Mag., Page(s): 128-135, Mar. 2001.

[7] OMG, X/OPEN, “The Common Object Request Broker: Architecture and Specification,” 1996.

[8] Liu, K.H.; Wilson, B.J.; Wei, J.Y.,”A management and visualization framework for reconfigurable WDM optical networks,” IEEE Network , Volume: 14 Issue: 6 , Nov.-Dec. 2000 Page(s): 8 -15

國際替代計量

分封交換傳輸之DWDM環狀接取網路控制管理系統

主題瀏覽