| 摘要 |
PURPOSE:To prevent transmission frame synchronization establishment disable state due to a pseudo synchronization pattern by detecting pseudo synchronization pull-in and applying frame synchronization re-detection. CONSTITUTION:Pseudo synchronization pull-in for frame synchronization is detected based on a frame synchronization establishing signal 6 from a frame synchronization acquisition device 1 and a multi-frame synchronization establishing signal 8 from a multi-frame synchronization acquisition device 2 and the frame synchronization acquisition device 1 is provided with a control means 3 commanding frame synchronization re-detection. The control means 3 discriminates whether or not the pseudo synchronization pull-in takes place by comparing the frame synchronization establishing signal 6 with the multi- frame synchronization establishing signal 8 and commands the frame synchronization re-detection detecting the pseudo synchronization lock to the frame synchronization acquisition device 1. Thus, the transmission frame synchronization establishment disable state due to pseudo synchronization pull-in of frame synchronization is avoided. |
