摘要
本文介绍了一种新型的适用于网状光网络物理层保护的智能实时监测保护设备的开发设计方案.设备采用基于"双发选收"模式的1+1保护设计方案,以ARM7系列微处理器S3C44B0X(ARM7TDMI内核)为硬件平台,移植U-Boot(作为Boot Loader)和嵌入式μCLinux操作系统到S3C44B0X上作为软件平台,在设备的光路设计中,利用M×N无阻塞型光开关矩阵或M×N严格无阻塞型(光开关+合波器)阵列实现保护光信号的选择接收和转发.设备的主要功能由在嵌入式μCLinux操作系统环境下运行的智能实时监测保护应用程序实现,应用程序的核心是利用保护光路径自动建立算法事先为每条工作光路径在保护光纤网络中寻找并建立对应的保护光路径.设备对工作光路径中的光功率进行实时监测,当工作光路径发生故障时,及时切换到保护光路径.本文最后以4节点光网状网为例,给出了保护光路径自动建立算法的仿真结果.本文中设计的智能实时监测保护设备是真正无人值守的适用于网状光网络物理层实时监测保护的设备,以全光保护方式实现了网状光网络的透明无阻断通信.
In this article,a new design of the intelligent real-time 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. The ARM7 series microprocessor——S3C44B0X （with an ARM7TDMI core） is used as the hardware platform of the device,U-Boot （as the boot loader） and the embedded μCLinux 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 non-blocking 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. The primary function of the device is implemented by the intelligent real-time monitoring and protecting application which runs under the embedded μCLinux 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 TCP/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
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第1期10-19,共10页
Journal of Nanjing University（Natural Science）
