公开(公告)号：US06754172B1

公开(公告)日：2004-06-22

申请号：US09723116

申请日：2000-11-27

申请人： Masayuki Tanaka ,  Masaki Kubo ,  Satoshi Nemoto ,  Shuji Sakakura ,  Shigeo Handa ,  Yuji Kamura

发明人： Masayuki Tanaka ,  Masaki Kubo ,  Satoshi Nemoto ,  Shuji Sakakura ,  Shigeo Handa ,  Yuji Kamura

IPC分类号： H04J306

CPC分类号： H04J3/0623 ,  H04J3/085 ,  H04J2203/0042 ,  H04J2203/006 ,  H04J2203/0096

摘要： A non-interruptive protection switching device which performs protection switching in a more efficient and robust way. The device has a working-channel signal storage unit to store data signals received through a working channel. Multiframe synchronization timings are detected by a working-channel multiframe synchronization controller, which provides a working-channel multiframe sync detection pulse signal when the main signals are in a normal condition and stops it when the channel is disrupted. A working-channel write controller controls every write access to the working-channel signal storage unit, generating a write pulse signal therefor. The working-channel write controller also produces working-channel write phase data by identifying a phase difference of the detected multiframe synchronization timing with respect to a reference phase signal. The generation of this write pulse signal is based on the multiframe sync detection pulse signal when the working-channel multiframe sync detection pulse signal is available, or on a free-running timebase when it is stopped. The stored data in the working- and protection-channel signal storage units are read out simultaneously, under the control of a read controller which produces read pulses from the write phase data.

摘要翻译： 一种非中断保护切换装置，以更有效和鲁棒的方式进行保护倒换。 该设备具有工作信道信号存储单元，用于存储通过工作信道接收的数据信号。 多帧同步定时由工作信道复帧同步控制器检测，当主信号处于正常状态时，该帧同步控制器提供工作信道复帧同步检测脉冲信号，并在通道中断时停止。 工作通道写入控制器控制对工作通道信号存储单元的每个写入访问，产生写入脉冲信号。 工作通道写入控制器还通过相对于参考相位信号识别检测到的多帧同步定时的相位差来产生工作通道写入相位数据。 当工作信道复帧同步检测脉冲信号可用时，或者在停止时的自由运行时基上，该写入脉冲信号的产生基于多帧同步检测脉冲信号。 工作和保护通道信号存储单元中存储的数据在读写控制器的控制下被同时读出，读控制器从写相位数据产生读脉冲。