In this article, a new design of the intelligent realtime monitoring and protecting device which is supposed to better adapt to the physical layer protection of the mesh optical network is introduced. The device obeys
the principle of 1+ 1 protection method which is based on the dual fed selective receiving mode. T he ARM7 series microprocessor ∀∀ ∀ S3C44B0X (with an ARM7T DMI core) is used as the hardware platform of the device, UBoot
( as the boot loader) and the embedded CLinux operation system are transplanted to S3C44B0X as the software platform as well. In the optical structure design of the device, a kind of the M ! N nonblocking optical switch
matrix or the M ! N strict non blocking optical switch and optical combiner array is used to select, receive and retransmit the protecting light signal. T he primary function of the device is implemented by the intelligent realtime
monitoring and protecting application which runs under the embedded CLinux operation system environment. With the algorithm of automatic establishment of the protecting light path, the intelligent real time monitoring and
protecting application establishes the protecting light path in the protection fiber network for each corresponding working light path in advance. And then a protecting light path route table will be dynamically established and
maintained by each device. During the establishment of the protecting light paths, devices communicate with each other by using T CP/IP protocol. And after the accomplishment of the protecting light path establishment, the
protecting light path route table of one device will be broadcasted to all the other devices. By means of converting the optical signal into the electric ones, the real time optical power of the working light paths is monitored by the
device. As soon as the fault of the working light path occurs, the device will switch to the corresponding protecting light path immediately. In the end of this article, the algorithm of automatic establishment of the protection light
path is assumed to be implemented in a 4 node mesh optical network, and the emulation result is given. The device
proposed in this article is a kind of real unattended intelligent real ?time monitoring and protecting device, which is suitable for the physical layer protection of mesh optical network. So by applying the proposed intelligent realtime
monitoring and protecting device, the transparent uninterrupted communication of mesh optical network could be achievable in the way of the full optical protection.
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References
[ 1 ] Huang L B, Zhang J, Zheng Y S. The real-ime supervisory system for optical cable. Study onOptical Communications, 2001( 2): 47~ 50. ( 黄龙波, 张 靖, 郑彦升. 光缆实时监测系统. 光通信研究, 2001(2): 47~ 50).
[ 2 ] Cao J Z, Bao Z W, Zhang G Z. Research on opti-al fiber cable line automatic monitoring system. Optical Fiber and Electric Cable, 2002( 6) : 33~ 测相关问题的探讨. 光纤与电缆及其应用技术, 2002(6): 33~ 37) .
[ 3 ] Zhang L, Li X, Da Q, et al. U tility model patent of intelligent optical fiber protection device( Ap-plication Number: 200420025242- 8 . Putian Communication Co. , Ltd. , Nanjing, 2004. 3.
(张 良, 李 想, 达 琦等. 智能化光纤保护装置 实 用 新 型 专 利 说 明 书 ( 专 利 号: 200420025242 ? 8) . 南京 普天通信股份有限 公司, 2004 ? 3) .
[ 4 ] Chen X. Monitoring and management system of fiber and fiber cable. Telecommunications for Electric Power System, 2002( 5) : 11~ 16. ( 陈 希. 光纤和光缆的监测与管理系统. 电力系统通信, 2002, 23(5): 11~ 16) .
[ 5 ] Meng H, Zhao Z, Li H Z, et al. Design and im-plementation of monitoring and detecting system of fiber cable. Computer Engineering, 2005, 31 (4): 195~ 196, 214. ( 孟 ? 和, 赵 ? 政, 李华舟等. 光缆监测系统的设计与实现. 计算机工程, 2005, 31( 4) : 195~ 196, 214).
[ 6 ] Saradhi C V, Murthy C S R. Dynamic establish-ent of differentiated survivable lightpaths in WDM mesh networks. Computer Communica -ions, 2004, 27( 3) : 273~ 294.
[ 7 ] Sun Y C, Li C Y. Development of optical power monitor based on embedded -ystem. Instrument Technique and Sensor, 2006(8): 7~ 9. (孙延春, 李长有. 基于嵌入式系统的光功率监测仪的研制. 仪表技术与传感器, 2006( 8) : 7~ 9) .
[ 8 ] Cao J Z, Bao Z W. Optical power real -ime su-pervision for optical cable. Study on Optical Communications, 2003( 2): 34~ 37. ( 曹俊忠, 鲍 振武. 光缆光功率实时监测. 光通信研究, 2003( 2) : 34~ 37) .
[ 9 ] LiY, Rong P X. Principle and application of em-edded ?clinux system based on S3C44B0X. Beijing: Tsinghua University Press, 2005, 109~117. ( 李 岩, 荣盘祥. 基于 S3C44B0X 嵌入式CLinux 系统原理及应用. 北京: 清华大学出版社, 2005, 109~ 117) .
[10] Zhang H K, Zhang S D, Liu W H. Principle and technique of router. Beijing: National Defense Industry Press, 2003, 71~ 115. ( 张宏科, 张思东, 刘文红. 路由器原理与技术. 北京: 国防工业出版社, 2003, 71~ 115).37
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Footnotes
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