| 摘要 |
PURPOSE:To attain synchronization with an optical space switch output in a time-division optical exchange which uses an optical space switch by setting a guard time and adding a signal for synchronism in front of a light data signal. CONSTITUTION:The additional signal 20 for synchronism is set before the data signal to be sent to one time slot and the guard time 22 is set before said signal 20 and after the data signal 21. The optical space switch functions as the time-division switch when each light signal has the guard time 22 even if there is variance in the time slot position of each light signal before the signal is inputted to the light space switch. Therefore, the data signal 21 can be restored correctly. |
